Hi what does it mean if I have low compression on my pit bike ?
- curmudgeon55Lv 76 months ago
depends on the ACTUAL pit bike. Is it a 4 stroke or 2 stroke? OHC or OHV as many Chinese Honda clones use? OHV clone small engine used in lawnmowers known to have intake/exhaust valves set close so don't rattle much- but with some running a bit of wear means zero lash cold turns to .002 to 004 negative clearance warm- solution is remove calve cover held with 1 or sometimes 2 cap screws or big wing nut and adjust valve lash to .004/.006 cold - get some rattle on start and maybe 3 minutes to warm up will still have a very slight tick when warm- and no leakage. For some engines the valve lash setting means pull pushrod and grind end, others used to have to remove valve and grind down end of valve stem- this for the early Brigges and Tecumsehs L heads. Couple incidents of head bolts not getting retorqued after few hours running, loosened bolt or cap screw means head gasket not sealed and leak results, later burned through gasket. Replace head gasket after cleaning surface of head and cylinder. @ strokes? check exhaust port for fouling, spark arrestor fouled.
- zipperLv 66 months ago
COULD be bad rings, or burnt values, sounds like over hall time!
- TardisAndTheHareLv 76 months ago
It means that there is not a tight seal between the piston and cylinder. This is a very serious problem because you will lack power and burn oil.
- adamLv 46 months ago
I never do compression test. Do a cylinder leak down test instead It will give you a better idea of whats going on
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- Anonymous6 months ago
It will run like a gutless wonder.
- FirestormerLv 76 months ago
Test it again but this time hold the throttle WIDE open. I bet you get a much better result.
- ExoplanetLv 76 months ago
Needs new rings, a cylinder bore, or possibly a head rebuild.
- Justin ThymeLv 76 months ago
It means you need to overhaul the engine.
- Tim DLv 76 months ago
Possibly that your rings are not forming as tight as a fit as they should, so as the piston raises some of the gases are escaping past the rings rather than being compressed. There are other possibilities, only investigation will reveal the problem.
- Anonymous6 months ago
It needs a rebore with an oversized piston and rings fitted.