jeep4lf

I have an rf600 with 18,000 miles just started one day getting super jerky power in second third and fourth gear between 3 and 9 k rpms and getting the worse around 6 and then getting a little better and going away by 9k rpms, I thought it was the carbs/fuel so I had them cleaned and serviced, which was much needed but the jerky power is still going on. The jerky power is best described as power, power, power,power,power, with about 1/4 of a second gaps. I have tightened the chain and changed the spark plugs, I can't really think of what it might be.

Turbo X_J

Gotta start somewhere, might as well do a compression test.

jeep4lf

Well can't find a compression test that fits my bike but I did see that the third cylinders spark plug has alot of carbon build up I changed the spark plugs and still does the power,power,power thing...

Turbo X_J

LOL, compression testers are all universal not brand and/or application specific. It's a start to figure out why it has a dead cylinder. If it has reasonable compression across the board, it's either fuel or spark.

jeep4lf

None of the shops had one that would fit my spark plug socket, but a home made remedy and compression is fine, talked to a shop and did a little work and found out the exhaust valves need cleaned and shimmed, did a little cleaning and working better still getting a little jerky, but considerably better

peckerwood1986

honestly my advise is make sure they did the carbs right most shops don't. Then you really need to try and do a compression test if it were me I would pull the top end of and really look at it. Also check the timing it my be off or jumping a little.