One cylinder has web other doesn't

For specific matters pertaining to the smoking thundering twins

Re: One cylinder has web other doesn't

Postby parksie » Tue Jul 19, 2011 2:18 am

I personally havn't done it but it was mentioned on another board that it has been done using a dremel and a far amount of patience
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Re: One cylinder has web other doesn't

Postby dinoGT » Tue Jul 19, 2011 3:09 pm

parksie wrote: You need a 97.5 main jet for the one with webbing and a 150 older style jet for the non web side.

I don't think so because air intake and jet needle and prehaps carburators are differents on those two differents models.
Yes, with a dremel (and a mountain of patience) you can do it
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Re: One cylinder has web other doesn't

Postby DickyArt » Wed Jul 20, 2011 8:49 pm

Well....I've now stripped the cylinders/pistons out and I'm on 71mm and I could throw the pistons back in from 20 yards! :cry:

Checked the clearance between piston and cylinder without rings and I can get 0.016" feeler down :o should only get 0.006" plus the bore is slightly scored and the piston is too. Not checked the other but doesn't seem any point.

Anyone know where Cylinders/pistons can be got? Everywhere I've looked has only +1.0mm pistons but no barrels.
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Re: One cylinder has web other doesn't

Postby dinoGT » Thu Jul 21, 2011 4:51 pm

The clearance ( play ? ) -distance beetwin piston and cylinder- on a new piston must be 0.06mm (or a little less)=>0.025" ,so , when there is 0.05" your motor become to be tired and at 0.06" your piston is ready to scratch.
IDU +1.0piston but no barrels. :oops:
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Re: One cylinder has web other doesn't

Postby DickyArt » Thu Jul 21, 2011 7:18 pm

dinoGT wrote:The clearance ( play ? ) -distance beetwin piston and cylinder- on a new piston must be 0.06mm (or a little less)=>0.025" ,so , when there is 0.05" your motor become to be tired and at 0.06" your piston is ready to scratch.
IDU +1.0piston but no barrels. :oops:


You have your numbers wrong there! clearance should be no more than 0.006" between piston and cylinder wall (0.15mm).
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Re: One cylinder has web other doesn't

Postby dinoGT » Sun Jul 24, 2011 6:38 pm

I think YOU are wrong
1" = 2.54cm
0.15/2.54 = 0.06" and not 0.006" ... it isn't ?
If some where people don't undertand (or if I am wrong) clearance good for T500 is from 0.055mm new to 0.15mm practicaly dead
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Re: One cylinder has web other doesn't

Postby dinoGT » Sun Jul 24, 2011 6:47 pm

:oops: I am wrong...
1" = 2.54cm = 25.4mm
0.15mm/25.4 = 0.006"
Sorry, i must be a wrong mathematics teatcher :roll:
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Re: One cylinder has web other doesn't

Postby DickyArt » Mon Jul 25, 2011 6:46 pm

No worries Dino. Used to measure for a living. But I like your style! ;)
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Re: One cylinder has web other doesn't

Postby DickyArt » Tue Jul 26, 2011 5:33 pm

I plan on grinding the web out and matching the ports too.
Made patterns of each cylinder and will take it steady :)
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Re: One cylinder has web other doesn't

Postby pedro » Thu Jul 28, 2011 5:39 pm

I would suggest looking at the ex port too as the timing is different between early T and GT

Re your earlier post, can,t find pistons over 1mm.

I stock up to 2mm o/s, I have barrels and I rebore in house

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