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To replace or not to replace my chromed cylinders?

T

tpeever

Just got it firing!
Joined
Jan 9, 2010
Messages
2
Location
My Town
Forgive me if some of you have seen this query on another forum but I am trying to gather as many opinions as I can before proceeding with my rebuild. I am restoring an 850T and have a question about chromed cylinder bores. Bike is a late model with an oil filter. I am getting conflicting advice about whether or not to replace the cylinders and would like to get some additional opinions on the matter. The bike has 30K miles and has been sitting for at least 15 years in a dry climate. When I disassembled the engine, everything looked pristine and I could not find any evidence of chrome peeling from the cylinder bores. The parts of the cylinder walls contacting the rings had a cloudy or scuffed appearance but were totally smooth to the touch and holding them up to a bright light revealed no evidence of blistering. So my question is, should I run these cylinders as they are or replace them? My inclination at present is to run 'em. I measured up the bores and there is no evidence of any measurable wear at all. Thanks for any and all advice.

Tobin
 
Tobin, I was recently in the same position except with a lower-mileage T3. Chrome bores need regular running to keep them in good shape and even though they look good visually there's no way of telling how good the bond is between the chrome and the bore. Replace the barrels with new Gilardoni Nikasil units and you get the benefit of new pistons, rings, circlips and gudgeons as well. It's well worth it to avoid having chrome plating scouring its way through your motor. The Gilardoni kits aren't always easy to find because they only do one run a year but MG Cycle have some in stock. My advice (although others differ) is to stick to the 850 barrels unless you're re-balancing the bottom end.

Peter
 
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