Hey...Subzero..Welcome to GC from Wisconsin.
The FSM indicates 188psi at 850rpms. Did you get it spinning fast enough?
The FSM indicates 188psi at 850rpms. Did you get it spinning fast enough?
Interested to hear how that carb works out for you, keep us posted.Thanks for the replies, I installed the carb tonight, read online these carbs run slightly lean because of emissions and have a brass insert over top the mixture screw so I removed it and turned the mixture up a very slight amount just to be safe. I think it has a 153 jet installed out of the box but came with a 150 and 155. I’m at sea level here so I don’t think swapping jets is necessary. Still waiting on a new fuel petcock in the mail to have a complete machine and then it’s time to see if it will run.
Started the bike up today and it’s running a little more rough than yesterday, seems to be misfiring and has a slight popping noise from the exhaust. Revs up fine and still drives fine but at idle it makes the noise. Almost like just after reving up when you release the throttle. Can’t seem to figure out what it could be. New carb, spark plug was just changed. Only thing I did between yesterday and today was a new fuel line as the other one was leaking and an oil change. I linked a video of the bike running
https://youtu.be/iTalFRnNxIY
Just rebuild your carb. Don't blow 400$ on something your perfectly capable of doing in 30 min yourself!Checked compression again today, right on spec at 188 psi and the starter was able to turn the engine fast enough to overcome the decompression mech. The bike runs better just after cutting the gas off on the petcock for a few seconds and the spark plug is black after only a short time running. I think you are right and it is the Chinese carb that is causing it to run badly. Strange it ran well the first hour of running but now doesn’t do good. I have no idea how to rebuild a carb properly and I’d rather just not mess something up more as I need the bike ASAP. I see a brand new one is around $390 from Yamaha. What would a shop charge to rebuild the carb off the bike?
Why didn't you just say from the beginning you've never rebuilt a carb before? There's no shame in that. That explains why you just bought the Chinese carb right away. But here's the thing... You had the skill to get to and remove and install the other carb. So I'm confident in your ability to to clean and install the parts from a carb rebuild kit in your OEM carb. And if the thing only sat for 3 months, it might only need a good cleaning and not even need a full rebuild kit.Checked compression again today, right on spec at 188 psi and the starter was able to turn the engine fast enough to overcome the decompression mech. The bike runs better just after cutting the gas off on the petcock for a few seconds and the spark plug is black after only a short time running. I think you are right and it is the Chinese carb that is causing it to run badly. Strange it ran well the first hour of running but now doesn’t do good. I have no idea how to rebuild a carb properly and I’d rather just not mess something up more as I need the bike ASAP. I see a brand new one is around $390 from Yamaha. What would a shop charge to rebuild the carb off the bike?
AGREEDJust rebuild your carb. Don't blow 400$ on something your perfectly capable of doing in 30 min yourself!
Sorry for the inactivity...I’d like to replace the diaphragm too when rebuilding. I used some intake/carb cleaner without removing it earlier on when I first got the bike and it deformed it. Which rebuild kit is good to buy?