Bike won't rev up above 5k rpm after carb rebuilding

[wakanalu]

My initial problem with the bike is that it wouldn't idle properly and was running only on one cylinder half the time. So I took apart the carbs and cleaned them, there was a lot of rust in the float bowls.

Anyway, after I put everything back together, the engine idled fine, but pretty high at about 3k rpm. At idle, the bike revved up easily all the way to 10k rpm. However, once I put it in first gear, the revs drop to 1k and seem to be not getting enough fuel. I had the hold the throttle open wide while releasing the clutch slowly moving off otherwise the bike would stall. Once I got moving, the highest rpm i got was 5k rpm and that was with the throttle fully open.

I have spent a lot of time and I don't want to bring it to a mech now. Help!!

[Church6360]

i had a similar problem after a carb cleaning i did, in my case it was the spring that pushes the slide down on my right carb. my advice, take it apart again, and re assemble very carefully, replacing o rings and gaskets if worn as you go. take time.

good luck.

[GSJames]

Did you pinch the fuel hoze going to the carb?  Did you connect all your hoses correctly?  Vacuum too?

And the rust you saw - I saw that too when I cleaned my float bowls, I'm not sure it's rust but rather the floats deteriorating after years (they're a brownish colour too right) so I think that its plastic crap that accumulates there.

[jiggersplat]

double check your vaccuum connection and that your fuel hoses are connected properly.

[scratch]

Check to make sure you still have the little o-rings that are underneath the black plastic covers of the carbs.

[wakanalu]

Thanks guys.

I am gonna try redoing the fuel hoses and I am probably gonna replace all the hoses with clear vinyl hoses. What is spec for the vaccum tube? Anybody know?