1988 lt230s help! - Suzuki ATV Forum
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post #1 of 3 Old 04-13-2019, 05:44 PM Thread Starter
T_M
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1988 lt230s help!

Hi everyone, I recently rebuilt the top end engine of this atv. I went oversized on the piston by 1.0. Everything is correct timing and all that. My issue is every time I kick start it excessive pressure builds up and escapes through the oil filter cap housing. I have gone through 3 oil filter caps because the excessive built up pressure cracks the caps and sprays oil every where. and the crankcase breather system is unobstructed as well. Any ideas on what is causing this excessive pressure?
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post #2 of 3 Old 04-14-2019, 01:40 AM
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It sounds like you have exessive compression leaking past the rings pressurizing the crankcase.

Your new rings might not be seated yet.

When you had your cylinder bored they could have messed up. If your cylinder is too large the rings would not seal.

Normally the crank case ventilator would bleed off this pressure. If it's not it could be plugged.

Also oil does not compress. If your oil level is too high the pressure bleeding past the rings would have no room to expand and could build up faster than it could bleed off through the crank case ventilator.

I'm just guessing too what could cause this. I've seen engines blow oil and run like crap from exess blowby but not so much pressure too crack a cap.
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post #3 of 3 Old 04-16-2019, 11:41 AM Thread Starter
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Quote:
Originally Posted by 440Tim View Post
It sounds like you have exessive compression leaking past the rings pressurizing the crankcase.

Your new rings might not be seated yet.

When you had your cylinder bored they could have messed up. If your cylinder is too large the rings would not seal.

Normally the crank case ventilator would bleed off this pressure. If it's not it could be plugged.

Also oil does not compress. If your oil level is too high the pressure bleeding past the rings would have no room to expand and could build up faster than it could bleed off through the crank case ventilator.

I'm just guessing too what could cause this. I've seen engines blow oil and run like crap from exess blowby but not so much pressure too crack a cap.
Great Thank you for the help. I don't think my cylinder is bored wrong, they matched with the over sized piston. But Ill check all those possible symptoms and causes. thank again for the help.
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