Ok, so this bike is starting to get to me. When I bought it it would barely idle and wouldn't rev past 7k or so. I thought it was dirty carbs and would be an easy fix. I have now adjusted all the valves, cleaned the carbs many many times, rejetted with 145, 147.5 and 150 mains, and tried those with 30, 35 and 40 pilots and tried those with zero and 2 washers on the needles. I quadruple checked float levels and replaced all worn o-rings in the carbs. I've replaced the cam chain tensioner. I've replaced the rubber boots between the carbs and cylinder. I've replaced the spark plugs. I've replaced the battery. It does the exact same thing now as it did when I started with it.
It barely idles; spits and sputters right off idle, and won't rev past 7k. Runs great from 3k til 7k though. And now it appears I have another fuel leak from somewhere in the carbs.... I'm considering throwing this bike off a cliff and just walking away from it.
Sounds like its probably electrical then. Where you located I'd be willing to swap out electrical parts for trouble shooting. I've got a few issues to.
I'm in So.Cal.
when you "cleaned the carbs", how long did you let em soak, or what process did you use to clean em O0
Did you check to make surer your carb breather hose isn't clogged?
What fuel are you running it on? Any ethanol in it?
You don't have a vacuum leak somewhere do you?
Your fuel leak if its due to a float sttiing too high (U tube method for checking is fool proof cos it takes into account the seat can be leaking or float needle not seating up fully) or some like that can cause the problem.
150 mains needs a K&N filter and pipe, 40 pilots needs (well, nothing) but you should have 40's in it not any of the others.
Now Looks like you have done a good smattering of swapping out random parts. Here is some more from us armchair mechanics.
Tank rust - check it, get rid of it.
Breather hose yes good one, but some models vent via the cap. make sure its clean.
Petcock especially the frame one - vacuum to fuel crossover can kill it.
Exhaust pipe - You think a small furry animal has taken up in there ?? if so get it out and re try.
It is not electrical I'd bet.
And my biggest guess for the 7K sputter - especially is you have 7K in 1-2, 6K in 3-4, and 5K in 5-6 max. As in when loads increase, the max rpm drops is ...
Rip in the diaphragm.
You can drop it off at the cliff - PM me for the address. Nice cliff, just leave the keys in the ignition and title and Bill of sale under the seat. Yea, the cliff is picky that way.
Cool.
Srinath.
My carbs have a vent hose that leads from the float bowl chambers.
I had a wasp build a nest in it causing fuel to flow out of my carbs, prevent it from idling properly and caused it to stall unless I was riding WOT (but it wouldn't run quickly) because it was literally flooding the engine with fuel.
In the outback I filled up with some crap, non sniffable fuel and it also prevented my bike from running faster than 90km/h. I've heard similar stories of people with carby bikes using E10 fuel.
Yeah, I made that mistake. 10% ethanol sucks ass.
To answer all the questions:
All the vaccuum ports on the carbs are sealed off with brand new caps, so I don't think there is a leak there. The only open nipple on the carbs is the vent "T" on the upper half, between the carbs. Thats were all the fuel dumps out of. It also overflows out of the idle mixture opening on the front of the carb, and out of the needle/main jet area. Since its coming out of everywhere, I've come to my next conclusion....
The fuel leak is most likely from the float need seat o-rings. I replaced them and they were a pain to get in and looked a little large. I got them to seat without leaking, but it probably vibrated loose and started leaking again.
As for the running and the jets, I think with the altitude I'm going to end up with 140-145 mains, and 25 pilots. The problem gets much worse when the bike warms up, and just runs super rich. I've tried down to 30 pilots and the idle screw still won't do anything. I'm going to pick up 25's and 20's this weekend and hope that I can get the idle screws to do something.
No rust in the tank
No breather hoses to be clogged. They've all been removed and all nipples are clear of debris and flowing well.
No frame mounted petcock to cut off fuel.
When you say rip in the diaphragm, which diaphragm? The slides seem to work fine when the bike is just sitting there and I've inspected them and couldn't find any tears. Is there another diaphragm somewhere?
Fuel is whatever comes out of the pump at a SoCal Chevron, regular grade. I believe all california fuel is upto 10% ethanol.
f%$k cali and their ghey ass fuel and retarded emissions requirements :flipoff: :flipoff: :flipoff: