Yamaha TRX850 Enthusiasts Forum

I had all the parts to do this, but I sold them with my old head

Anyway, time to do it! I'm going to order all the parts from the US, am I correct in thinking it's the TDM850 parts I need as the TRX was never sold in the US?

I'll hone the bores, replace the valve stem seals, rings & camchain, so I need valve stem seals, rings, all the gaskets the camchain, anything I've missed?

They only appear to list 0.5mm oversize rings for the TDM, will I be able to use these or will that not work? I suspect it won't...

Thanks in advance!

Might be worth a PM to Cobba.
See if he has any of this left, might save you a few bucks.
http://www.trx850.com/phpBB_forum/viewt ... 33&t=10363

Hi MV,

I did this job earlier this year. Part ordered including part numbers and prices are here:

http://www.trx850.com/phpBB_forum/viewt ... &start=165

Yes, all TDM 850 parts and you just want standard size rings unless you are doing a rebore. I ordered from PartShark and ordered the hone (3-3/4" flex-hone) from ebay

Love your work, thanks fellas!

Look at the option of a copper head gasket, not only reusable but you can get a thinner gasket made to raise the compression ratio a few points. Your not shaving material off the head then to achieve the same result. Std gasket thickness is 1mm . (0,75mm compressed)
Your copper gasket does not compress and the old guy who makes mine up gives me an option of 0.55mm , 0.9mm, 1.2mm.

Does the copper head gasket need any sealant for fitment Brian ?

Yes Alex,
I have some hylomar spray I'll be using on mine. Brett used the same when sealing his head gasket.
It's there to seal against coolant fluid leaks .

cobbadiggabuddyblooo wrote:Look at the option of a copper head gasket, not only reusable but you can get a thinner gasket made to raise the compression ratio a few points. Your not shaving material off the head then to achieve the same result. Std gasket thickness is 1mm . (0,75mm compressed)
Your copper gasket does not compress and the old guy who makes mine up gives me an option of 0.55mm , 0.9mm, 1.2mm.

I probably won't, though it's good to have the option, thanks for bringing it to my attention.

I'd prefer not to have to remove the head again in a hurry & the extra money is probably better spent getting the FCR's in my shed on the bike! Certainly more power gains than a couple of compression points

Not chasing power gains at this stage, just want to stop the oil burning.

Edit: Found the standard rings, about $200 US all up for the parts, plus freight, not too bad at all.

Hi M.V, from which site did you order the parts from?

Haven't ordered yet, but Partzilla.com is the cheapest, that's where I usually go. Used to be Partshark, but Partzilla is slightly cheaper & has Honda stuff also.

M.V. wrote: I probably won't, though it's good to have the option, thanks for bringing it to my attention.

I'd prefer not to have to remove the head again in a hurry & the extra money is probably better spent getting the FCR's in my shed on the bike! Certainly more power gains than a couple of compression points

Not chasing power gains at this stage, just want to stop the oil burning.

Edit: Found the standard rings, about $200 US all up for the parts, plus freight, not too bad at all.

You have PM.