Question about 2004 Yamaha PW 80
Hi, Adam and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Pw 80 runs awful
Pw80 over oiled rich no power exhaust carb fuel probl
YAMAHA PW80 Owner Service Manual
OEM parts for Yamaha
YAMAHA PW80 Owner Manual
Posted on Feb 04, 2017
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Posted on Jan 02, 2017
As far as your clutch adjustment ,I can't help you but the fact that the bike is older you might want to try removing the exhaust pipe at the baffel end and see if there is a difference in power ,if there is clean out your baffel and your good to go.
hope this helps
Posted on Apr 13, 2009
Check the carbs if all jets are well placed, needles all at same height, float levels equal, collars between carbs and cil head all tight, rubbers not punctured or broken...
Posted on Aug 22, 2009
You may have not tightened coil and coil wire screws enough. 2 strokers are notorious for vibrating their bolts loose. Bad earth will nullify spark. Check for clean connections on all leads from crank to coil and CDI unit. Is plug and cap 100%. Check top end gaskets if any sign of moisture on sparkplug.
The float pin may be worn and extending out past ends and jamming on carby housing. Take out and roll on flat surface and look for defects. Ensure float tab (bears on needle) is not notched from wear or bent too far. Clean seat and needle are essential, replace if suspect. Spray some carby cleaner thru fuel line entry whilst you have floatbowl off to clear any sediment or debris. (especially fuel scale or air filter foam)
Posted on May 04, 2010
SOURCE: 92 virago 750. Front
You have to test all the electronics on the bike to figure out if you have a bad CDI box. A CDI box can test good and still be bad. Your problem sounds more like a bad spark plug cap. Unscrew the cap from the end of the wire and take an OHM reading on the cap. If it is higher or lower than 5000 OHMs replace the cap . A plug cap from NGK runs about $5. Replace them both for about $10 it should take care of the problem.
Posted on Oct 04, 2010
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