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t80 heads

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Post  mark1982 Tue 30 Sep - 7:04

need a bit of advice my mate has got a head for his bike but its stamped y3 instead of y4 does any1 know what differance is an if it will run on the t80 engine thanks

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Post  JohnW Tue 30 Sep - 8:55

mark1982 wrote:need a bit of advice my mate has got a head for his bike but its stamped y3 instead of y4 does any1 know what differance is an if it will run on the t80 engine thanks

Y3. Think its just a casting number (its cast in not stamped) there is also another cast number on a T80 one I have. 22K. So is a T80 head. I would think they are cast in sets of 4 & numbered 1 - 4, just a guess.

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Post  mark1982 Tue 30 Sep - 14:35

ok i will tell him to give it go see what happens

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Post  mark1982 Sun 5 Oct - 4:42

nope the engine wont run for love nor money with a y3 head runs perfect on the y4 head think my mates going have to get a new head or new engine

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Post  Admin drgaz Sun 5 Oct - 8:00

you using the same cam shaft? I recon the valve timings differnt
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Post  JohnW Sun 5 Oct - 10:33

I dont think the 'Y' number has any bearing on the matter, I have T80 engines with Y6 & Y7 heads & both run fine. As I said in a previous post these numbers I think relate to casting numbers not part numbers, & as daz says the problem is more likely camshaft & valve timing. Not sure if T50 camshaft is the same as T80, probably not as stroke is different.
Swop the camshaft over from the other head.

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Post  mark1982 Mon 6 Oct - 2:06

how on earth do you get the cam out looked an cant see how ? think the timing must be differant as both timing marks spot on

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Post  JohnW Mon 6 Oct - 8:44

mark1982 wrote:how on earth do you get the cam out looked an cant see how ? think the timing must be different as both timing marks spot on

You have to withdraw the rocker shafts OR valves so rockers clear the cams. The rocker shafts have a threaded end which you screw an 8mm bolt into & pull out (they are behind the cam sprocket). You will need to warm up the head to enable them to slide out.

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Post  mark1982 Mon 6 Oct - 20:11

so ive got thread bolt into hole were the cam bolt hole is an pull it thru?

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Post  JohnW Mon 6 Oct - 20:29

mark1982 wrote:so ive got thread bolt into hole were the cam bolt hole is an pull it thru?

NO No  Its the rocker shafts (& rocker arms)  you have to remove first. Best to buy a Haynes manual, its in there how to do it. If you try to pull the cam shaft out without removing these you will f**k it up.

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