hi pulled my exhaust off today to check the cond of my piston discovered it had wear marks light scratches so ended up taking the top end off the cylinder has worn the plating off inbetween the exhaust valves is this a common prob??? would this bee a reoccuring problem?? i have the eg 144 kit the rest of the cylinder was fine. took it to the bike shop they said it was from heat and it happens from time to time i am getting the cylinder re chromed. also the weights on the crank have little chuck taken out of them must be from a previous blow up the bike shop said not to worry as long as the conrod was tight. any help would be great!
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Hi everyone,
As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.
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125-200cc 144 piston and cylinder wear over exhaust port
- Thread starter dboza86
- Start date
water racer
Husqvarna
Pro Class
I should not be commenting on this because I have no first hand experience. However, I have read on this forum that the EG kits are not chamfered well which causes early failure. Get it replated and chamfered by a good company and you should be ok.
GP
GP
If the bridge is less than 3mm wide it will grow and swell inboard and can start to wear on the piston. Can buff off some material on the face of the bridge to give more clearence for this. Also if not done on the skirt of the piston drill a couple tiny holes for bridge lube and cooling.
Later George
Later George
Up-tite;106829 said:
Both the stock and OEM 144 kit have them...
the bridge needs to be machined (before and after plating) by 0.06 mm with a special tool (radius around 1800 mm). if this company does not have this tool, don't let them repair your cylinder.
bytheway: making the bridge wider means that it will store more energy, and therefor the problem will be worse.
r
bytheway: making the bridge wider means that it will store more energy, and therefor the problem will be worse.
r
thanks for all the info, they are a well known company and they do big bores themselves also warranty there work for 6 months when i go to pick the cylinder up i will make sure he has done what you guys have mentioned. the piston was a eg wiseco 144 it had the oil holes maybe the plating wasnt done right the first time.