Kawi2strokes.com Forum

It's easy to do a leak down test.If the crank seals are bad, split the cases and rebuild the crank. With bad crank seals it will never run right and if the seals
are bad the bearings maybe too. When I built my first H1 I looked at the crank and seals and they looked fine, big mistake. I did a leak down test when I
put it back together and it was holding the 6 psi but not for more than and minute. 6 months later my right outer crank bearing retainer came apart and
destroyed the right outer crank seal. I tried to kick it over and it hydro-locked, lucking I didn't destroy my new pistons. These are old bikes and if the crank
has never been rebuilt its only a matter of time before problems can occur.

A proper crank rebuild from porschedave

Held pressure no problem after a proper job

With bad crank seals would the bike idle and rev fine? when I rev it up it comes back down to idle immediately. I hope it's not the seals i'm trying to enjoy this bike and i'm like a little kid on Christmas and your not going to tell me it's broke! but seriously I know. I read the article on the leak down test and understand it's not that easy to do.

Yes, it will seem fine, just be dead trying to take off......

_________________
Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

A lot of smoke when not running right doesn't sound like it's starving for fuel to me, it sounds like it's drowning in fuel. Are these real Mikuni jets, or might they be from a carb rebuild kit?

_________________
If it surges, that's normal, upshift.

Ive tried 3 different sets of jets, the originals that were on the bike and another set off a different set of carbs and I even tried the jets from the rebuilt kit. The jets labeled 102 seemed to work the best. Today I'm going to try the carbs off my khs 500 and see if those work any better.

Aren't the stock mainjets 92.5? 102 would be way rich. My 74 H1 calls for 92.5 mains. This would also throw off your needle making everything over 1/4 throttle way rich.

Main jets have nothing to do with 1/4 to 3/4 throttle position and the pipes/air filter will determine what size main is needed.

Darbydog, maybe had you observed the prerequisites in http://www.3cyl.com/mraxl/manuals/carbtune/carbtune.htm you would not have the problems you've encountered.

_________________
Answers are here: http://kawatriple.com/

I have seen/heard this before, but doesn't all fuel that goes through the needle jet first get sucked through the main jet?

Yes, but the area between the needle and needle jet is less than the area of the main jet, until 3/4 throttle and the needle is far enough out to be larger than the main jet area. (proper jetting of course)

_________________
Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

If your main jet and needle jet are from one of the carb rebuild kits it will be hard to tune. I tried mains and needles
from one of the kits, crap. You could just look at the needle as see it was total garbage. I put genuine Mikuni mains and
needles back in and wow, like night and day.