General Category > General Discussion
Over pressurized crankcase Cal III
Old Jock:
I feel a little guilty for not posting earlier when you were searching for the cause.
Many early posts pointed the breather system and as I'm not familiar with how the Tontis breathe decided I'd nothing to contribute.
However I had a similar problem with a Sporti and was going to suggest the first thing to do was a compression and leak down test if possible, as also suggested by Wayne.
In my case after a rebuild I was getting leaks at the sump spacer after a rebuild. After many gaskets, seals, etc: a compression test showed lower than optimal compression and a difference between the cylinders greater than 10%.
Checking the bores, both were out of spec in size, one side by a staggering amount and the really bad one had ovality too.
The mileage was around 12k, pretty sure it had been that way leaving the factory, but ran Ok.
The teardown and rebuild disturbed the fragile piston ring/cylinder relationship and exacerbated the issue.
I got the cylinders relined and the bike has been fine since, glad I did ,though not at the time. Prior to the fix it was a grenade with a very loose pin
Glad you got to the bottom of it and appear to well on the way to getting it resolved
MattP:
look some one detenated that thing so. what , well looks like 2mm longer stroke on 1100 so half 1mill .03937 thowsands id run them or i could take.020 off want the used rings how cheep are you ha . any way just looked at them. you will be . you know they put shims under clinders to avoid ping, dettenation let me know what you think you can allways trim them down you will have a little softer engine with more heat to
talarece with plenty power maybe loose a few hp at 7500rpm. kind of bizzy with garadge build mite make a wood box don,t need busted finns ect. mattp or spiker51@yahoo.com matthew phillippi 500 third st excelsior mn 55331. at library down street but can get email on dinglebeary
Vecchio Lupo:
Matt P,
I have no idea about how much to trim. I guess just the half Mil, ( I won't hold you responsible , we are in uncharted water) I'll spring for new rings. of course I'll turn engine by hand and use putty to see if Ive got any clearance issues. At any rate....I'll email you my address and you let me know how to pay you. Im in Guantanamo until the summer so the parts will sit in Charleston until I get home and resume work.
Thanks.
MattP:
Joe machined off .020 look nice. Going to try to send to your home monday . When you get home check them out then just send check. Oh you might clean them up debur base.
Vecchio Lupo:
Guzzisti Unite!!!!
Thats what is so cool about the Guzzi Community. Our dealer network is almost non existent, so we rely on each other. Hell yeah Brother.
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