Question about 2004 Yamaha PW 80

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I have a pw 80 it runs perfect when its in neutral, whe you put i in gear it runs fine until you give it gas then it bogs out.I have put a new cylinder a piston ring and carb. Still does the same thing

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  • Yamaha Master
  • 41,653 Answers

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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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 2 Answers

SOURCE: bogging issues and clutch adjustment on 1980 RM 125

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
jerry

Posted on Apr 13, 2009

  • 265 Answers

SOURCE: 1985 yamaha moto 4 200 power surges

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

ckoira57
  • 267 Answers

SOURCE: i replaced the cylinder and piston and rings on my 98 yz 125

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)
Cheers.

Posted on May 04, 2010

heimlich
  • 1978 Answers

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

  • 84 Answers

SOURCE: i have an 98 r1

have ya checked or changed the oil if smelling raw may be an issue

Posted on Feb 19, 2011

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I have a pw 80 that runs perfect in neutral when you put it in gear it runs fine until you try to go then it bogs out. I put a new cylinder, head,piston and ring as well a new carb. It still does the


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
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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.
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