Crank seal

C Holmes · 09-27-2009, 04:22 PM

If say theoretically the crank seal is gone in my ski would it start hard all the time or only when the engine has warmed up? Anyone know?

lownrangr · 09-30-2009, 02:59 AM

don't know. but if i were to 'guess' i'd say that a bad or missing crank seal would cause the engine to run lean and make it run funny. Funny as in bad.

C Holmes · 09-30-2009, 06:56 AM

runs fine, just hard to start when warm

dank · 09-30-2009, 02:33 PM

That may be from the carb dripping while sitting and flooding the engine? It could also be a sign the starter is going bad and not turning the engine over the same speed when hot?

C Holmes · 09-30-2009, 06:47 PM

Nope, turns fine and the carb is rebuilt and does not leak. I think it maybe coil but was curious about the seal and the symptoms it may cause.

dank · 09-30-2009, 11:02 PM

Normaly it will cause either the front or rear cylinder to run lean and that would cause engine failure.

DA YAMMIE · 10-11-2009, 12:19 PM

Quote:

Originally Posted by dank

Normaly it will cause either the front or rear cylinder to run lean and that would cause engine failure.

would there be a noticable difference in performance with a bad seal? cause the front seal is the only thing i dident check when i had engine trouble, and does the front seal push in without splitting the base on a 98 ts770? i know on a twin cyl snomobile when you have a bad seal you will run only on one cyl.

dank · 10-13-2009, 09:18 AM

If a seal was bad it wouldn't run long before it would cause piston failure. Only way to check is to presure test it but you would have to remove the carbs and exhaust to do that. If it is hard to start do you still have a choke or a primer kit? If choke put one tablespoon of premix down each spark plug hole first then try. If it starts easy then either install a primer kit or maybe open up the low speed adjuster 1/4-1/2 a turn this will help also.

C Holmes · 10-13-2009, 08:15 PM

I think maybe a bad coil

C Holmes · 06-20-2010, 08:37 AM

I have the same problem, thought was a coil but it is not as I tried another. Did you figure this out?