One cylinder has web other doesn't

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One cylinder has web other doesn't

Postby DickyArt » Fri Jul 08, 2011 8:24 pm

My GT500 has miss matched cylinders. With and without the inlet web.
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Will this effect the balance/mixture?
I plan on putting expansions and air pods on it.
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Re: One cylinder has web other doesn't

Postby dinoGT » Wed Jul 13, 2011 7:24 pm

without alloy inlet => T500
with alloy inlet => GT500
I think if you don't put a knife form (or put off the alloy inlet, not cast iron) on the GT cylinder, it must be good
EDIT: is Furness cul-de-sac the real name of your country ?
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Re: One cylinder has web other doesn't

Postby parksie » Thu Jul 14, 2011 4:28 am

To be more specific
The ones with the allow web are T500s 73 or later including GT500
The ones without the web are t500s pre 1973
The webbing is more restrictive hence the ones without webbing produce more power when properly setup with the appriopriate jets and carb to piston mounts
You should not have two different ones on the same motor.
Hope this helps
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Re: One cylinder has web other doesn't

Postby DickyArt » Thu Jul 14, 2011 3:56 pm

I know they are from different age motors and they should be the same....but on a non tuned motor except for expansions and pod filters would that extra web make any difference to jetting?
And if so how much? Been advised to use 120 mains with Titan expansions with air pods.
The bike has had these "odd" cylinders since I have known it, at least 16 years and it always ran smooth/OK.
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Re: One cylinder has web other doesn't

Postby dinoGT » Thu Jul 14, 2011 8:28 pm

I think it does no matter.
The different of bore (piston/cylinder)is always important and it can need different jetting and shurely give a tired motor.
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Re: One cylinder has web other doesn't

Postby DickyArt » Fri Jul 15, 2011 7:28 pm

Furness cul-de-sac is actually the Furness Peninsula. South part of Cumbria! Just south west of Lake Windermere. UK.
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Re: One cylinder has web other doesn't

Postby scooteroo » Sat Jul 16, 2011 10:08 pm

Hi All, Been a while, I had this same set-up with my motor, I have just "fukt" the piston in the barrel from the GT(I have since found out that it is the GT barrel) I did know that the porting was different and the inlet longer on the GT, but as with another poster, that was how it was when I got the motor, silly me. I believe this has caused it to run lean on that cylinder and caused the failure? Can anyone comfirm this for me? Thanks in advance.
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Re: One cylinder has web other doesn't

Postby DickyArt » Sun Jul 17, 2011 11:24 am

Both port lengths are the same, they measure 40mm (from the centre of the port face towards the outer side of the web, which is approx the inlet centre as the web is off-set).
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From seeing the dark markings on the left hand piston I'm now going to strip it down to measure up and have a butchers :roll:
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Re: One cylinder has web other doesn't

Postby parksie » Mon Jul 18, 2011 4:05 am

The jetting is different between the two. If you jet them they same as for the lack of webbing then one will be running rich and conversly if you jet them as if they both had webbing then one will be running lean.
You need a 97.5 main jet for the one with webbing and a 150 older style jet for the non web side.
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Re: One cylinder has web other doesn't

Postby DickyArt » Mon Jul 18, 2011 7:38 pm

OK cheers Parksie.
What about removing the web?
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