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
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...
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.
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.
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