Hello,
Im a first time poster here, and i am unsure if this is the right sub-forum for my topic, but this place was the one that made most sense to me.
I bought a 1997 Yamaha YZF 600 Thundercat project bike this summer, and was hoping I would manage to fix it up.
After some rounds of trial and error im not really getting any closer to fixing the problems with it. So i was hoping there where some Thundercat/Yamaha gurues here that could help me a bit with my problem.
The thing is that when i bought the bike it wouldn't idle, but it could be driven so long as you kept the revs up a bit. My tiny experience with motorcycle repairs lead me to believe that this was a carburetor related problem. So the first thing i did was to take out the carburetors and clean the jets and those tiny bras? parts inside the carburetors. Also, before reassembling the bike i adjusted the air/fuel-mixture screws to stock settings. I noticed that one of the screws was like just 1 revolution out from bottoming, while the stock setting is suppose to be 2,5. The other 3 screws where at about 2,5 revolutions out.
but then i started the bike up again i had this totally different problem. Now the idle was just fine, but the throttle got stuck when reving up the bike. A bit of research on the new symptoms suggested that this was because of an air leak. So i started to look for some of those. I tried the trick with spraying some WT-40 on parts that are prone to air leaks, but now really getting any results, but when taking a closer look at the rubber connection hoses between the carburetors and the engine it looked like they where quiet worn. So i changed them for new ones, but this didnt help either.
So this brings us to where i am today. Can anyone help me figure out that is wrong with this bike.
Thanks i advance.
-Kristian