jjfizzle51 Posted January 22, 2006 Report Posted January 22, 2006 hey all i just did a compression test on my cylenders on both it was about 120-125 average. isnt this low since im running a cool head/w 19cc domes at about 45oo feet elevation? and i just tested it cold will it improve if i run the bike for a few minuets. also if it stays this low i can add a timing plate does anyone know about how much compression each advance adds with a timing plate thanks for any help Quote
2003LimitedBanshee Posted January 22, 2006 Report Posted January 22, 2006 hey all i just did a compression test on my cylenders on both it was about 120-125 average. isnt this low since im running a cool head/w 19cc domes at about 45oo feet elevation? and i just tested it cold will it improve if i run the bike for a few minuets. also if it stays this low i can add a timing plate does anyone know about how much compression each advance adds with a timing plate thanks for any help 463071[/snapback] Adjusting the timing does nothing for increasing the compression in the cylinder, it simply dictates at what time during the crankshaft rotation the impulse to fire the spark plug will be sent. It does however increase the likelihood of pre-ignition, and that is why you must start to run a mix of race fuel, depending on compression and amount of advance. On the compression test, it should definitely improve if the engine is warmed up, as compared to cold. As the engine warms, the metal (pistons, rings etc.) expands very slightly, decrease the ring gap and increases the compression reading you will get. Quote
BigRed350x Posted January 23, 2006 Report Posted January 23, 2006 Adjusting the timing does nothing for increasing the compression in the cylinder, it simply dictates at what time during the crankshaft rotation the impulse to fire the spark plug will be sent. It does however increase the likelihood of pre-ignition, and that is why you must start to run a mix of race fuel, depending on compression and amount of advance. On the compression test, it should definitely improve if the engine is warmed up, as compared to cold. As the engine warms, the metal (pistons, rings etc.) expands very slightly, decrease the ring gap and increases the compression reading you will get. 463095[/snapback] Hot to cold you won't notice hardly any difference. Might get like 3 or 4psi. Maybe. Quote
dawarriorman Posted January 23, 2006 Report Posted January 23, 2006 Well, according to the charts, 4000 ft is 152 lbs, and 5000 ft is 137 lbs. So at 4500 yes you are low. I would go ahead and throw some new rings in it if I were you. Quote
jjfizzle51 Posted January 23, 2006 Author Report Posted January 23, 2006 its only 2 years old should it be that low in two years? Quote
fastbanshee8 Posted January 23, 2006 Report Posted January 23, 2006 It depends on how much it's been rode, and how hard it's been rode. More hours and riding it hard, are going to add up to more rebuilds. Maintenance also plays a factor. Quote
BigRed350x Posted January 23, 2006 Report Posted January 23, 2006 its only 2 years old should it be that low in two years? 463174[/snapback] Shit dude, i go through a set of rings every couple months. I ride my shee all day almost every saturday and sunday. Not just little putt around, I romp on the thing all the time. I would LOVE to get 2 years out of a top end. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.