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Yamaha chappy carburator settings

Engine running badly

Posted by Anonymous on

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  • Yamaha Master
  • 40,627 Answers

Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor damaged, contaminated, sticky float, plugged jets.
13. Fuel filter clogged.
14. Old or contaminated fuel.
15. Fuel tank vent system plugged or carb vent line closed off.
16. Gas cap diaphragm valve faulty.
17. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
18. Carburetor controls misadjusted.
19. Incorrect valve timing.
20. Valve springs floating, weak, or broken.
21. Damaged intake or exhaust valve.
22. Incompatible performance parts.
23. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.mopedarmy.com/forums/read.php?6,1752807
Yamaha Carb Tuning
http://projectmopedmanual.info/Manuals/Yamaha/Yamaha%20LB2%20Chappy%20service%20manual.pdf
OEM parts for Yamaha
http://citroensaewnrut.blogspot.com/2013/10/free-download-download-yamaha-chappy.html

Posted on Feb 03, 2017

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Posted on Jan 02, 2017

  • 191 Answers

SOURCE: regarding the fuel stopcock of

You have a vacuum operated petcock....so that when engine starts and draws vacuum...a diaphragm lifts in the petcock to supply fuel to carb. When the engine shuts off...vacuum is lost and the petcock closes.
If you run the tank empty....in order to get fuel into the carb and get the bike started initially....you can open the petcock without engine vacuum by rotating petcock to the PRIME position. Once started return the petcock to the ON position. If you leave it on prime....with engine off...fuel may leak into carb and run into engine and contaminate crankcase oil with fuel.

Posted on Mar 23, 2011

  • 84 Answers

SOURCE: yamaha tt-r 225 backfires, no

You carb needs to be removed, completley disassembled, and soaked in a quality carb cleaning solution, overnight. The bad fuel has gummed up your carbs internal passageways

Posted on May 13, 2011

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1 Answer

Regarding the fuel stopcock of yamaha chappy, it has three settings: on, reserve and PRI, what is the neaning of PRI?, thanks...


You have a vacuum operated petcock....so that when engine starts and draws vacuum...a diaphragm lifts in the petcock to supply fuel to carb. When the engine shuts off...vacuum is lost and the petcock closes.
If you run the tank empty....in order to get fuel into the carb and get the bike started initially....you can open the petcock without engine vacuum by rotating petcock to the PRIME position. Once started return the petcock to the ON position. If you leave it on prime....with engine off...fuel may leak into carb and run into engine and contaminate crankcase oil with fuel.

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Hi,i`ve got a yamaha fz750 1988..and it won`t seem to run on all four cylinders..i took the air box off and while it was running put my hand over each carb one at once and found that on carb 4 it stopped...


Hi JIm,
If it stopped @ 4 tht means thts the only cylinder firing .
Remove the spark plugs,earth @ on the cylinder head, crank start and check for sparks...if its sparking tht means the coils etc. are ok.
As the spark plugs are out exam them to their conditions visit this site for more details :-
http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

From here you would know if its carburator or probably it may need a complete tune up....carburator cleaning, float level..adjustment, valve clearance.. new plugs (gap to specs.), check air filter, replace or fit 'inline' fuel filter thn balancing of the carbs.
Hope this helps!

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1 Answer

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Also remove the carburators and see if the intake are clean from any corrosion probabley due to water entered into the system thus seizing the valves and piston.
If all is clean and ok, thn the engine may have to be dismantled to check the siezure, could be at the crankshaft or the cylinders at the piston.
Not a bad idea if you first remove the starter motor thn tryto push it with any gear selected .

Good luck .

Knight (Yamaha XJ 750 A 1981)

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