Ceramic liner?

[biker_jay]

you were very lucky then.

if the inlet cam seizes, which is not uncommon, it is not unusual for the inertia in the crank to keep the crank rotating, which strips teeth off the timing gear on the crank as the timing chain has stopped moving at the camshaft, until a piston meets some valves.

I was lucky then. I've never heard of it happening before and wasnt too sure why it had happened. Now i know its nearly as thirsty on oil as my rd350 i can guess that it was a lack of oil that caused it. once i'd re-profiled it, i tapered the oil feeds and cut a grove into the aluminium where the shaft sits, seems to bo doing the job.

[TonyDevil]

the stock TDM900 motor DOES NOT burn oil
there have been 1 or 2 members on carpe who have reported minor 1off level drops, but nothing prolonged or common

[steve speed]

so what have yamaha done on the 900 to stem the flow of oil ?

[TonyDevil]

so what have yamaha done on the 900 to stem the flow of oil ?

ceramic liners

[steve speed]

not an easy fix then !

[TonyDevil]

not an easy fix then !

nope
cheaper to modify the frame and fit a complete 900 motor than have the work done on an 850
everyone i know thats looked at modding the 850 like that has turned away for one reason or another
either cost or complexity
i dont even know if theres enough meat in the block to do the work

[steve speed]

to be honest if i needed to do a mod like that i would change the bike,,,probably go for a speed triple or a superduke

[youngy]

mmmmmmmmmmmm Speed Triple

[steve speed]

yep my mate's got one ,it has a zard pipe and sounds the dogs its a 06 bike and very very nice

[biker_jay]

Well if its just the liners that are different then we can put the barrels and pistons and all other bits off the 900 on top of the 850 crank? I'm sure this has been tried before but i dont know where the info is. I'll have a look.

[Quan-Time]

im not really sure if ceramic coating / liner is the real solution here.

Different cylinder walls means different piston and ring design. The size and spacing of the oil ring is how much oil the piston will retain for lube. If you have this fairly large, obviously its going to rub more oil on the cylinder, and thus burn it faster. Black sooty exhaust + loss of oil.

Ceramic liner requires less lubrication. Because of that you can run less oil on your oil retainer ring on your piston. If you strip your engine and regap your oil retainer ring, you can reduce the amount of oil it holds and rubs onto your wall.

2 different performance shops and JE pistons both advised AGAINST ceramic / nikasil bores and recommended matched rings / pistons. Ive yet to run the engine with this new setup, but its quite surprising that i was advised against it. It cost money to do it, so it was sort of a loss for them. JE also advised against piston coating, even tho its a motorbike with higher revs than what a car produces.

Im not saying a liner is bad, it obviously works. But if you have stock TRX pistons + piston rings, its still going to throw the same amount of oil on the walls.

[steve speed]

when i fitted my JE 878 kit i checked the oil ring like you said quan time,, and with the oil expander installed ( the wavy bit ) on the piston and then placed in the bore, the piston just went down under its own weight ,,so not much ring pressure on the bore ,, this is how it came from JE so thats how i left it , and so far no smoke and as far as i can tell no oil useage ,, allthough its early days yet and i did the stem seals as well ,,fingers crossed

[slow codger]

Steve you're not thinking of 2 strokes and oil scraper rings are you ??

Re ceramic liners, remove and put a handle and base on and voila somewhere for your tea (have I got the wrong post here, should this be under TRX merchandise ?)

Dave E

[steve speed]

Steve you're not thinking of 2 strokes and oil scraper rings are you ??

Re ceramic liners, remove and put a handle and base on and voila somewhere for your tea (have I got the wrong post here, should this be under TRX merchandise ?)

Dave E

have you been at the sherry again

[slow codger]

Unfortunately not, 9 hour night shift tonight and tomorrow.

Dave E