Valve identification

youngy · Post by **youngy** » Wed Dec 19, 2007 6:35 pm

I seem to recall a post somewhere about later inlet valves having a different marking on them. Anyone know or did I dream it?

Does anyone know which engine number the later inlet valves were introduced on? I know it's supposed to be 1997, but I've got a cylinder head that I can't date, although I know the engine number it came from.

Post by **phuk72** » Wed Dec 19, 2007 7:39 pm

http://trx850.motomaniac.net/forum/view ... ght=valves

youngy · Post by **youngy** » Wed Dec 19, 2007 7:53 pm

Thanks I saw that Pete, but it doesn't actually tell me what I want to know.

Quan-Time · Post by **Quan-Time** » Wed Dec 19, 2007 8:57 pm

the 3 inlet valves are smaller, and identical to eachother.
the 2 exhaust valves are larger and identical to eachother.

if you measure them, you can tell them apart easily as the inlet are smaller than the exhaust.

youngy · Post by **youngy** » Wed Dec 19, 2007 9:36 pm

And inlet have different marks on the face to exhaust. Which doesn't solve the riddle.

HansJ · Post by **HansJ** » Wed Dec 19, 2007 9:43 pm

Quan-Time wrote:the 3 inlet valves are smaller, and identical to eachother.
the 2 exhaust valves are larger and identical to eachother.

if you measure them, you can tell them apart easily as the inlet are smaller than the exhaust.

hold your horses...

IIRC, the middle inlet valve actually differs from the two other, probably a different length due to the different valvestem angles. And I believe that they also are marked differently, maybe that's what You are thinking of Youngy?

Not that it helps in identifying the valves though...

youngy · Post by **youngy** » Wed Dec 19, 2007 9:45 pm

HansJ

HansJ · Post by **HansJ** » Wed Dec 19, 2007 10:04 pm

I have to take a raincheck on the number You asked for. Thought I had it written down somewhere. I'll ask in the German forum, they'll definitely know, Germans You know...

youngy · Post by **youngy** » Wed Dec 19, 2007 10:07 pm

Cheers Hans - appreciated

HansJ · Post by **HansJ** » Wed Dec 19, 2007 10:49 pm

From frame nr 13284, but remember, matching nrs are unusual...

Courtesy, the trustworthy Germans 'Black TRX', 'Jonas' and 'H1' (who also lurks around in this forum)

youngy · Post by **youngy** » Wed Dec 19, 2007 11:23 pm

Thanks Hans (and the German lurkers)

steve speed · Post by **steve speed** » Thu Dec 20, 2007 12:56 pm

mines a 1997 with a frame No15444 so are we saying its got latter valves?
i do hope so its been in my mind to change them ,thanks HansJ

Killerwhale · Post by **Killerwhale** » Thu Dec 20, 2007 1:23 pm

Maybe Yamahas part number will help!? Then you could ask your dealer.

Here are the -97:
-97 Vaves

Noticeable though....-96 got the same part numbers....

...perhaps i did not get the question at all!

slow codger · Post by **slow codger** » Thu Dec 20, 2007 4:53 pm

I keep seeing posts re the new valves, I await mine falling to bits and wrecking the engine.............Frame number 216 on a 1995!! I hope Its already been done.

Dave E

burty · Post by **burty** » Thu Dec 20, 2007 4:55 pm

Killerwhale wrote:Maybe Yamahas part number will help!? Then you could ask your dealer.

Here are the -97:
-97 Vaves

Noticeable though....-96 got the same part numbers....

...perhaps i did not get the question at all!

Yes but the fact that Yamaha list the same part number for replacement parts for the different year doesn't mean that the original parts fitted to the two years were not different. if you see what i mean. If the original valves fitted to the 96 bikes were substandard then it's reasonable to expect the replacement to be the new spec.

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Valve identification

Valve identification

Re: Valve identification

Re: Valve identification