Valve clearence for VukaXs125 2007

Valve clearence is to tight, compression then becomes zero when hot and when cooled down again compression is back. Adjust clearence maybe 0.05 mm more up, but check all valves an all cylinders.
You could have a burnt seat too.

you should get the specs you need on google or phone honda tech

hi, coud well be a compresion problem, when the bike is started will it tick over or does it just peter away and stop if you remove your hand from the throttle? recheck the valve clearances, have they been adjusted with the engine on he correct stroke? when the cam lobes are facing down the valve clearenes should be set with the engine on tdc, and cold, it is always best to have a slightly larger clearence to alow for expansion , good luck paul

hi, are you saying since you addjusted the valve clearences the bike wont start? re check make sure you had the engine on the correct stroke, remove spark plug, check piston is at tdc, and the cam lobes are facing down, recheck your clearences here, hope this helps/paul

Valve Clearance Cold - Inlet : 0.07 -
0.12 mm
Valve Clearance Cold - Exhaust : 0.12 - 0.17mm http://www.motorbikespecs.net/index.dyn?flag=2&model_id=2147939&make=Yamaha

This site gives most tech. details required for your bike. Cheers.

need to check valve clearence, valves to tight, i have a yz450 you need a shim kit to adjust valves

"Valve Clearance" refers to the small gap between the valve lifter and the valve stem that allows the valve to completely close. Remove the Valve Cover and set the crankshaft to the timing marks (only found in your service manual), for each particular valve to be completely closed. Loosen lock nut and set with a feeler guage then retighten the locking nut on the adjustment shaft. Four valves = four adjustments. Does this help?

change engine valve

you use a set of feeler guages to measure the gap between the valve and the tappet (the arm that opens the valve) there is a intake and exhaust gap setting. you'll have to do some research to find out what the gap should be for your motor.

doulbe check the grounds, & you might need to add and extra ground wire to the bike, closer to the starter. This should help. There is a valve that release the compression when you kick it off.You might see if you can pull this release the compression valve while pushing the start button????