JPS6140453A - Engine provided with diaphragm type carburettor - Google Patents

Engine provided with diaphragm type carburettor

Info

Publication number
JPS6140453A
JPS6140453A JP16082184A JP16082184A JPS6140453A JP S6140453 A JPS6140453 A JP S6140453A JP 16082184 A JP16082184 A JP 16082184A JP 16082184 A JP16082184 A JP 16082184A JP S6140453 A JPS6140453 A JP S6140453A
Authority
JP
Japan
Prior art keywords
fuel
engine
diaphragm type
pump
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16082184A
Other languages
Japanese (ja)
Other versions
JPH0148391B2 (en
Inventor
Hiroto Kobayashi
弘人 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Walbro Far East Inc
Original Assignee
Walbro Far East Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Walbro Far East Inc filed Critical Walbro Far East Inc
Priority to JP16082184A priority Critical patent/JPS6140453A/en
Publication of JPS6140453A publication Critical patent/JPS6140453A/en
Publication of JPH0148391B2 publication Critical patent/JPH0148391B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/02Floatless carburettors
    • F02M17/04Floatless carburettors having fuel inlet valve controlled by diaphragm
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)

Abstract

PURPOSE:To surely and simply start an engine, by forming a cam on the drive shaft of a recoil starter so that a pump is driven by the cam to bleed air and to suck fuel from a tank upon starting of a diaphragm type carburetor. CONSTITUTION:A cam 34 formed on the shaft of a starter device 30 for an engine 27 provided with a diaphragm type carburettor 2, reciprocates a rod 35 through a roller 43 to drive a diaphragm 36 pump 33 which is communicated at its one end with a hole 40 in a metering chamber 16 in the diaphragm type carburettor 2 and at the other end with the upper section of a fuel tank 1. Upon starting of the engine when a handle 31 is pulled to actuate a recoil starter 30, the cam 34 drives the pump 33 which sucks air and vapor from the carburettor and then discharges the same into the tank 1, and therefore, fuel in the tank 1 enters into the carburettor through the hole 7 while residual air and vapor are discharged.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は例えばチェンソー、刈払機などの携帯作梨別の
底部にある燃料タンクから燃料ポンプにより気化器へ燃
料を吸引圧送し、どのような運転姿勢でも常にメータリ
ング空の内部を一定負正に保つことにより、全方位運転
を可能とするダイヤフラム型気化器付を備えたエンジン
に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention is a portable machine such as a chain saw, a brush cutter, etc., in which fuel is suctioned and pressure-fed from a fuel tank at the bottom of a portable machine to a vaporizer using a fuel pump. This invention relates to an engine equipped with a diaphragm type carburetor that enables omnidirectional operation by always maintaining the inside of the metering at a constant negative or positive level even in the driving position.

[従来の技術] このf逆のエンジンでは、展料タンクが作業会の底部に
あるため、エン−ジン始動前は燃料タンク上部の燃料管
および気化器の内部が空気で満たされているので、この
空気を除去しないとエンジンの始動が困難である。
[Prior Art] In this f-reverse engine, the fuel tank is located at the bottom of the working chamber, so before the engine starts, the fuel pipe at the top of the fuel tank and the inside of the carburetor are filled with air. If this air is not removed, it is difficult to start the engine.

また、エンジン停止後10数分前後は、エンジンの伝導
熱、雰囲気熱、日照による輻射熱などのために高温とな
り、気化器の燃料が蒸発してベーパーで満たされ、エン
ジンがまだ暖機温度にあっても、ペーパーのために混合
気過薄となり、始動困難、始動後の運転継続困難めるい
は運転停止などの不具合があった。このような不具合を
解決するには気化器から空気を除去するか、またはエン
ジンの始動に際して燃料を気化器へ補給し、または吸気
管へ噴出させることが要求される。
In addition, for about 10 minutes after the engine has stopped, the temperature will be high due to the engine's conduction heat, atmospheric heat, and radiant heat from sunlight, and the fuel in the carburetor will evaporate and be filled with vapor, and the engine will still be at warm-up temperature. However, due to the paper, the air-fuel mixture became too lean, causing problems such as difficulty in starting, difficulty in continuing operation after starting, or even shutdown. To solve this problem, it is necessary to remove air from the carburetor, or to replenish fuel to the carburetor or inject it into the intake pipe when starting the engine.

この要求に応えるものの一つとして、従来、米国特r+
第3494343号明i書に開示される技術がある。こ
の従来技術はスポイトに類似する手押しポンプと、この
上下流側に接続した1対の一方向弁を備えたものを、燃
料タンクと気化器または吸気管との間に接続し、これに
より始動前または始動と同時に燃料を気化器を経てまた
は直接に吸気管へ供給するものである。しかし、予め吸
気管へ燃料を供給しても、空気り流れがないと吸気管内
における燃料の気化が必ずしも十分でなく、エンジン始
動と同時に燃料を供給することが望ましいが、このよう
な操作は煩瑣で熟練を要し、燃料が却って必要以上に吸
気管へ供給され、始動を困難にする場合もある。
One way to meet this demand is to use the U.S.
There is a technique disclosed in Document No. 3494343. In this prior art, a hand pump similar to a dropper and a pair of one-way valves connected upstream and downstream of the pump are connected between the fuel tank and the carburetor or intake pipe. Alternatively, fuel is supplied to the intake pipe via a carburetor or directly at the same time as the engine is started. However, even if fuel is supplied to the intake pipe in advance, the vaporization of the fuel within the intake pipe will not necessarily be sufficient if there is no airflow.It is desirable to supply fuel at the same time as the engine starts, but such operations are cumbersome. This requires skill, and in some cases, more fuel is supplied to the intake pipe than necessary, making starting difficult.

[発明が解決しようとする問題点] そこで、本発明の目的は気化器のメータリング室の空気
や燃料ガスなどを強制的に除去することにより、気化器
に備えられているダイヤスラム型燃料ポンプによる燃料
タンクからの燃料補給作用を助長せしめるとともに、こ
のような作用を始動操作すなわちリコイル装置の操作と
連動して自動的に行うダイヤフラム型気化器付きエンジ
ンを提供することにある。
[Problems to be Solved by the Invention] Therefore, an object of the present invention is to forcibly remove air, fuel gas, etc. from the metering chamber of the carburetor, thereby improving the diaphragm type fuel pump provided in the carburetor. An object of the present invention is to provide an engine with a diaphragm type carburetor that facilitates refueling from a fuel tank and automatically performs such an action in conjunction with a starting operation, that is, an operation of a recoil device.

[問題点を解決するための手段] 上記の問題点を解決するするために、本発明はエンジン
始動クランキング用のリコイル1lilと連動する自動
式吸引ポンプにより、燃料タンク上部の燃料管と気化器
のメータリング室から空気、燃温ベーパーおよび燃料を
吸引して燃料タンクへ還流させるとともに、燃料ポンプ
により燃料タンクの燃料を気化器のメータリング!へ充
満させるようにしたものである。
[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an automatic suction pump that is linked to a recoil 1lil for engine starting cranking. Air, fuel temperature vapor, and fuel are sucked in from the metering chamber and returned to the fuel tank, and the fuel pump meters the fuel in the fuel tank to the vaporizer! It was designed to fill the air with water.

すなわち、エンジンのリコイル装置30の回転軸をカム
軸34として構成し、これにより往復動される作動杆3
5を自動式吸引ポンプ33のダイヤフラム36に結合し
、ばね37との協働によりダイヤフラム36を往復動さ
せ、これにより公知のダイヤフラム型気化器2のメータ
リングv1,6から燃料ガスなどを吸引排出し、燃料タ
ンク1へ戻すようにしたものである。
That is, the rotating shaft of the engine recoil device 30 is configured as a camshaft 34, and the operating rod 3 reciprocated by the camshaft 34
5 is coupled to a diaphragm 36 of an automatic suction pump 33, and the diaphragm 36 is reciprocated in cooperation with a spring 37, thereby sucking and discharging fuel gas etc. from the metering v1, 6 of the known diaphragm type carburetor 2. The fuel is then returned to the fuel tank 1.

[作用] 自動式吸引ポンプ33により気化器2のメータリング室
16の燃料ガスなどが吸入口40から燃料タンク1へ排
出されるから、メータリング室16の圧力低下に伴って
流入弁10が開き、ダイヤフラム型燃料ポンプ50によ
り燃料タンク1から燃料がメータリング室16へ補給さ
れ、このメータリング室16から燃料噴口21を経て吸
気管の内部へ燃料が吸引され、エンジンの始動が可能と
なる。
[Function] Since the automatic suction pump 33 discharges fuel gas and the like from the metering chamber 16 of the carburetor 2 to the fuel tank 1 from the suction port 40, the inflow valve 10 opens as the pressure in the metering chamber 16 decreases. The diaphragm type fuel pump 50 supplies fuel from the fuel tank 1 to the metering chamber 16, and the fuel is sucked from the metering chamber 16 into the intake pipe through the fuel nozzle 21, making it possible to start the engine.

[発明の実施例] 本発明を実施例に基づいて説明する。第1図は本発明に
係るエンジンに搭載されるダイヤフラム型気化器2を示
す。同図において、3は気化器本体、4は燃料ポンプ5
0のカバー、5は図示していないエンジンクランク至の
脈動圧導入口、6は燃料ポンプダイヤフラム、7は燃料
流入口である。
[Examples of the Invention] The present invention will be described based on Examples. FIG. 1 shows a diaphragm type carburetor 2 mounted on an engine according to the present invention. In the figure, 3 is the carburetor body, 4 is the fuel pump 5
0 is a cover, 5 is a pulsating pressure inlet to an engine crank (not shown), 6 is a fuel pump diaphragm, and 7 is a fuel inlet.

エンジンクランク空の脈動圧によるダイヤフラム6およ
び逆止弁47,48の作用により燃料タンク1の燃料が
吸引され、流入弁10へ圧送される。
Fuel in the fuel tank 1 is sucked in by the action of the diaphragm 6 and the check valves 47 and 48 due to the pulsating pressure of the engine crank, and is forced into the inflow valve 10.

11はメータリングダイヤフラム、12はメータリング
レバー13を回動可能に気化器本体3に支持する支軸、
13はメータリングレバー、14はばねであり、メータ
リングレバー13の一端を流入弁10に、他端をダイヤ
フラム11にそれぞれ付勢係合している。15はメータ
リングカバーで、外気と連通している。エンジンの運転
中はメータリングダイヤフラム11の作動によりメータ
リング室16は低負圧に保持され、作業時の全方位運転
を可能とする。
11 is a metering diaphragm; 12 is a support shaft that rotatably supports the metering lever 13 on the carburetor body 3;
13 is a metering lever, and 14 is a spring, one end of the metering lever 13 is biased to the inflow valve 10, and the other end is biased to the diaphragm 11. 15 is a metering cover, which communicates with the outside air. During operation of the engine, the metering chamber 16 is maintained at a low negative pressure by the operation of the metering diaphragm 11, allowing omnidirectional operation during work.

気化器本体3には実質的に吸気管の一部を構成するベン
チュリ孔17および絞り弁孔18が前後に貫通している
。絞り弁孔18を横断直交する絞り弁軸19に蝶形絞り
弁20が取付けられ、運転操作により絞り弁孔18が開
閉される。蝶形絞り弁20のアイドリング開度に対応す
る絞り弁孔18に複数個の低速燃料噴口21が開口し、
低速燃料針台針弁22により計量された燃料が噴出し、
アイドリンク開度および低開度運転ができる。
A venturi hole 17 and a throttle valve hole 18, which substantially constitute a part of an intake pipe, penetrate the carburetor main body 3 from front to back. A butterfly-shaped throttle valve 20 is attached to a throttle valve shaft 19 that is orthogonal across the throttle valve hole 18, and the throttle valve hole 18 is opened and closed by driving operation. A plurality of low-speed fuel nozzles 21 are opened in the throttle valve hole 18 corresponding to the idling opening degree of the butterfly-shaped throttle valve 20,
The fuel measured by the low-speed fuel needle needle valve 22 is ejected,
Idle link opening and low opening operation is possible.

23は後述する自動式吸引ポンプの作動時にメータリン
グ室16へ空気および燃料の逆流を防止するための逆止
弁である。ベンチュリ孔17には高速燃料噴口24が開
口し、高速燃料計】針弁25により計量された燃料が噴
出し、高速運転ができる。26はアイドリンク時および
自動式吸引ポンプの作動時に、高速燃料噴口24よりメ
ータリング蛮16へ空気の逆流を防止する逆止弁である
Reference numeral 23 designates a check valve for preventing air and fuel from flowing back into the metering chamber 16 when an automatic suction pump, which will be described later, is activated. A high-speed fuel nozzle 24 is opened in the venturi hole 17, and fuel metered by a high-speed fuel gauge needle valve 25 is injected, allowing high-speed operation. Reference numeral 26 designates a check valve that prevents air from flowing back into the metering bar 16 from the high-speed fuel nozzle 24 during idling and when the automatic suction pump is activated.

第1図は本発明に係るエンジン27を示す側面図である
。28はエアクリーナ、29は排気マフラである。30
はエンジン始動クランキング用のリコイル装置、31は
リコイルハンドルで、リコイル17す32に巻付けたロ
ーブ先端に連結され、リコイルハンドル31を引出すこ
とにより、リコイルプーリ32が回転し、クラッチを介
してエンジンのクランク軸に始動回転を与える。
FIG. 1 is a side view showing an engine 27 according to the present invention. 28 is an air cleaner, and 29 is an exhaust muffler. 30
31 is a recoil device for engine starting cranking, and 31 is a recoil handle, which is connected to the tip of a lobe wrapped around the recoil 17 and 32. When the recoil handle 31 is pulled out, the recoil pulley 32 rotates, and the engine is activated via the clutch. Give starting rotation to the crankshaft.

33は自動式吸引ポンプで、34はリコイルプーリ32
の軸の端部に設けたカム軸である。35はカム1PIl
134に応動する作動杆で、カム軸34に摺接するロー
ラ43を軸支持している。作動杆35はエンジンに固定
されたリコイル装置30の枠45に1凹動可能に支持さ
れ、かつ一端をポンプダイヤフラム36に固着され、リ
コイル時戻しばね37と協動して摺動し、吸気弁38お
よび吐出弁39の2個の逆止弁により自動式吸引ポンプ
作用を行い、第2図に示寸メータリング室16の燃料ガ
スなどが吸引口40、吸引管41および吸引弁−:38
を経て自動式吸引ポンプ33により吸引され、吐出弁3
9およびタンク還流管42を経て燃料タンク1へ還流さ
れる。9は燃料タンク1の底部に配置したフィルタ8と
気化器の燃料流入ロアとを結ぶ燃料管である。
33 is an automatic suction pump, 34 is a recoil pulley 32
This is a camshaft installed at the end of the shaft. 35 is cam 1PIl
134, which axially supports a roller 43 that is in sliding contact with the camshaft 34. The operating rod 35 is supported by a frame 45 of the recoil device 30 fixed to the engine so as to be movable in one direction, has one end fixed to the pump diaphragm 36, slides in cooperation with a return spring 37 during recoil, and closes the intake valve. An automatic suction pump function is performed by the two check valves 38 and discharge valve 39, and as shown in FIG.
through the automatic suction pump 33, and the discharge valve 3.
9 and tank reflux pipe 42 to the fuel tank 1. A fuel pipe 9 connects the filter 8 disposed at the bottom of the fuel tank 1 and the fuel inlet lower of the carburetor.

[発明の効果] 本発明は以上の如く構成されているので、リコ  −イ
ル操作による通常5回前後のエンジン始動回転と連動し
て自動式吸引ポンプ33が作動するため、従来の手動式
吸引ポンプの如くリコイル操作前のポンプ操作が不要と
なり、操作が簡単である。また、機械的連動のためポン
プ作動が確実であり、さらに自動式吸引ポンプ33の取
付位置がエンジンの高温部より離れ、かつ燃料タンク1
に近接しているため、温度上昇も少なく、自動式吸引ポ
ンプ33の内部のベーパー発生が少なくなり、自動式吸
引ポンプ33の作動が非常に確実である。このため、燃
料タンク1の上部の燃料管9およびダイヤフラム型気化
器2の内部の空気や燃料ベーパーはリコイル操作の都度
、メータリング空16の吸引口4oより吸引され、燃料
タンク1に還流されるため、エンジンの始動および始動
後の継続運転が安定かつ向上する。
[Effects of the Invention] Since the present invention is configured as described above, the automatic suction pump 33 operates in conjunction with the engine starting rotation, which is normally around 5 times due to recoil operation, so that the automatic suction pump 33 is operated in conjunction with the engine starting rotation, which is usually around 5 times due to recoil operation. This eliminates the need to operate the pump before recoil operation, making the operation simple. In addition, the pump operation is reliable due to mechanical interlocking, and the mounting position of the automatic suction pump 33 is away from the high temperature part of the engine, and the fuel tank 1
Since the temperature rise is small, vapor generation inside the automatic suction pump 33 is reduced, and the operation of the automatic suction pump 33 is very reliable. Therefore, air and fuel vapor inside the fuel pipe 9 at the upper part of the fuel tank 1 and the diaphragm type carburetor 2 are sucked through the suction port 4o of the metering air 16 each time a recoil operation is performed, and are returned to the fuel tank 1. As a result, engine starting and continued operation after starting are stabilized and improved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係るエンジンにおけるダイヤフラム型
気化器の正面断面図、第2図は同ダイヤフラム型気化器
付きエンジンの正面図である。 2:ダイヤフラム型気化器 16:メータリング至 3
4:カム軸 35:作動杆 4o:吸引口41:吸引管
 42:タンク還流管 43:ローラ 特許出願人  株式会社ウォルブ口− ファーイースト
FIG. 1 is a front sectional view of a diaphragm type carburetor in an engine according to the present invention, and FIG. 2 is a front view of the engine with the same diaphragm type carburetor. 2: Diaphragm type carburetor 16: To metering 3
4: Cam shaft 35: Operating rod 4o: Suction port 41: Suction pipe 42: Tank reflux pipe 43: Roller patent applicant Wolveguchi Co., Ltd. - Far East

Claims (1)

【特許請求の範囲】[Claims] エンジンのリコイル装置と機械的に連動する自動式吸引
ポンプにより、リコイル操作時ダイヤフラム型気化器の
メータリング室より燃料ガスを吸引し、燃料タンクへ還
流させることを特徴とするダイヤフラム型気化器付きエ
ンジン。
An engine with a diaphragm carburetor that is characterized by an automatic suction pump mechanically linked to the engine's recoil device that sucks fuel gas from the metering chamber of the diaphragm carburetor during recoil operation and returns it to the fuel tank. .
JP16082184A 1984-07-31 1984-07-31 Engine provided with diaphragm type carburettor Granted JPS6140453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16082184A JPS6140453A (en) 1984-07-31 1984-07-31 Engine provided with diaphragm type carburettor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16082184A JPS6140453A (en) 1984-07-31 1984-07-31 Engine provided with diaphragm type carburettor

Publications (2)

Publication Number Publication Date
JPS6140453A true JPS6140453A (en) 1986-02-26
JPH0148391B2 JPH0148391B2 (en) 1989-10-19

Family

ID=15723141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16082184A Granted JPS6140453A (en) 1984-07-31 1984-07-31 Engine provided with diaphragm type carburettor

Country Status (1)

Country Link
JP (1) JPS6140453A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141660U (en) * 1986-02-27 1987-09-07
DE4413270B4 (en) * 1994-04-16 2005-05-04 Fa. Andreas Stihl Jump-start device on a diaphragm carburetor
US10823124B2 (en) 2017-03-27 2020-11-03 Kohler Co. Carburetor drain

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223638U (en) * 1975-08-08 1977-02-19
JPS5419538A (en) * 1977-07-14 1979-02-14 Tatsuji Sasai Heattinsulating sash

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223638U (en) * 1975-08-08 1977-02-19
JPS5419538A (en) * 1977-07-14 1979-02-14 Tatsuji Sasai Heattinsulating sash

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62141660U (en) * 1986-02-27 1987-09-07
JPH0441238Y2 (en) * 1986-02-27 1992-09-28
DE4413270B4 (en) * 1994-04-16 2005-05-04 Fa. Andreas Stihl Jump-start device on a diaphragm carburetor
US10823124B2 (en) 2017-03-27 2020-11-03 Kohler Co. Carburetor drain
CN113236447A (en) * 2017-03-27 2021-08-10 科勒公司 Carburetor exhaust
US11614060B2 (en) 2017-03-27 2023-03-28 Kohler Co. Carburetor drain

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