itsmyforte Posted August 22, 2004 Report Posted August 22, 2004 i have been trying to get this thing jetted properly for the past few weeks. seems the main is very close to being correct but i just can't get the low end to come in properly. i decided to look into things a bit closer. i have noticed a lot of white smoke coming out the exhaust. i decided to look at possible air leaks. looks like the intake boots are cracked where the boost bottle goes in, and also on the underneath side where the carbs mount. but knowing that air leaks don't usually cause white smoke i did a compression check and i have 125 per cylinder same as it was 6 months ago. i thought maybe coolant was entering the system somewhere but it doesn't use any, its always full. i decided to take off the head for inspection and i found lots of gouges in the right side of the head and a few gouges in the left side. the piston tops look a bit of build up but nothing out of the ordinary. looking through the intake runners the piston skirts look all fine and dandy as well. so what could be causing this white smoke and could that be affecting my difficulty jetting as well? i have attached a pic of the head. Quote
sweetshee4312 Posted August 22, 2004 Report Posted August 22, 2004 is your oil running down, tha could be casueing the smoke....just a sugestion Quote
SICK BOY Posted August 23, 2004 Report Posted August 23, 2004 The marks on your domes look like they were caused by broken piston rings. Quote
itsmyforte Posted August 23, 2004 Author Report Posted August 23, 2004 i have not noticed any oil loss in the low end. i thought the marks were caused by piston ring damage but with 125 compression each side. seems odd, unless the previous owner did a quick and dirty re-ring or redid the top end without cleaning up the head. Quote
J.J. Posted August 23, 2004 Report Posted August 23, 2004 (edited) If the piston crowns are not showing the same damage as the combustion chambers then the damage must be from a previous train smash. What do the cylinder walls look like, if they don't have any gouges then things should be ok, especially with the compression you're getting. As for the white smoke, pretty sure it's coolant being burnt. Could be coming from a leaking water pump shaft seal. Where are you checking the coolant levels? Also take a good look at the gasket sealing surfaces of the head and cylinders for traces of coolant passing from the cooling jacket to the cylinder. Regarding the oil in the low end comment, there isn't any in the low end of this engine, the oil is in the gearbox only. Typically burnt oil is a blue-ish color and could be leaking past the crankseal. Renew those carb boots as soon as possible, then check you jetting. Edited August 23, 2004 by J.J. Quote
itsmyforte Posted August 23, 2004 Author Report Posted August 23, 2004 (edited) Regarding the oil in the low end comment, there isn't any in the low end of this engine, the oil is in the gearbox only. Typically burnt oil is a blue-ish color and could be leaking past the crankseal. Renew those carb boots as soon as possible, then check you jetting. i was referring to the gearbox when i said low end. as in i was implying i don't believe the gear oil is getting into the crank. when i checked the coolant level it was at the filler cap in the radiator, it was as full as one could get. as far as the carb boots, should i go with OEM or like the vito's or other brand. i am running stock carbs and at this time do not wish to change anything. i did not notice any coolant seepage in the head from what i could tell, however i did not check the impeller area. what area should one look at specifically inside the water pump area for leakage? i am used to working on 2-smokes, but this is my first banshee. Edited August 23, 2004 by itsmyforte Quote
J.J. Posted August 24, 2004 Report Posted August 24, 2004 Could be coming from a leaking water pump shaft seal. I was talking through my ass here, if the waterpump seal is leaking the coolant will mix with the tranny oil, so this is a non-issue. Late night... I am using UPP carb boots, they come in pretty colors, so check them out. Unfortunately I don't have their website url. You could try the following to determine if the head gasket is indeed leaking: With the radiator cap off and the coolant level visible, get the bike to idle and try to see for traces of combustion pressure making it's way into the coolant. This should be evident by bubbles, etc. If you don't have any overheating problems and the you're not losing any coolant, then it must be something else. You never did say if the piston crowns had the same damage as the cylinder head... Quote
itsmyforte Posted August 24, 2004 Author Report Posted August 24, 2004 (edited) You never did say if the piston crowns had the same damage as the cylinder head... they do not, just a bit of carbon build up. Edited August 24, 2004 by itsmyforte Quote
fixitrod Posted August 24, 2004 Report Posted August 24, 2004 You never did say if the piston crowns had the same damage as the cylinder head... they do not, just a bit of carbon build up. I have to agree with the theory there. If the top of the pistons were fine I'd say it's from a previous tragedy of the crank going out on somebody. That isn't from a crank going out... it's from a crank that already went out. Quote
itsmyforte Posted August 24, 2004 Author Report Posted August 24, 2004 well as many searches i have performed i am convinced that i have a coolant leak somewhere. i am ordering a new head gasket and intake boots for starters. i'll go from there i guess. it must be just enough of a leak to cause the white smoke, but not enough to really use up the coolant fast. 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.