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Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Mon Sep 07, 2009 12:27 am
by tony
cezeta wrote:starstream bore 57 stroke 48
vega bore 46.4 stroke 44
Cheers Nick. I take it then the diameter of the webs is the same. If this is the case why hasnt anyone looked into spark eroding or machining a new hole for the big end on the other side if the starstream crank webs are so rare? Or is this just being silly and impossible? Or has anyone made a new crank for these motors?
Is there enough metal on casing to fit larger webs? Is the spline fitting the same as a gp?
So many questions...
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Mon Sep 07, 2009 12:39 am
by sean brady scooters
are you thinking along the lines of 54mm stroke/54mm bore tony........?
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Mon Sep 07, 2009 1:36 am
by tony
The magic number?! I'm just curious. I have a possible project. We'll see. Not my money.
It seems so far that there are obsticles re the tune. Not a fan of this single chain at all. That sounds dodgy to me. Also this rare crank business. Thats not good. However I like the square stud spacing..(the prob with lammy and pranges). So this is a plus. I reckon they will vibrate like hell without a balanced crank mind you due to the vertical position of the cylinder if we go mad on the tune. Any one know the web diameter? I bet its similar to a smallframe crank?
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Mon Sep 07, 2009 9:27 am
by jonny snatchsniffer
cant you use an eccentric pin ? and a reedvalve smallie barrel, might not give you much over 120cc but the stud spacing might be close
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Mon Sep 07, 2009 12:40 pm
by sean brady scooters
web diameter 80mm/crankcase.....82mm.......i think tony.........
small frame vespas are approx 87mm are they not.......(inlet side)...........
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Tue Sep 08, 2009 12:27 am
by tony
Yes mate.... I wonder...
Anyway enough of this jibber jabber... i've a bike to rebuild!
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Tue Sep 08, 2009 1:35 pm
by dapper
Getting back to the original thread, any news on putting Mick's tuned cylinder in an engine and testing? I am eagerly awaiting test info on this (like a kid waiting for Xmas)
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Fri Jan 01, 2010 2:40 pm
by grimspeed
so its 2010 now and i have no finger nails left.
have we tested the 150 cylinder that this thread was started for?
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Fri Jan 01, 2010 6:09 pm
by drunkmunkey6969
yes...ages ago, it was covered in another thread, you'll have to search for it.....anyone got a link?
Re: GP150 cylinder - Mick Abbey Tuned - Back to the old scho
Posted: Mon Mar 16, 2015 12:34 pm
by scooterslag
I know its a old thread now but has anyone fitted this tune to their scooter? and if so what's the performance like on the road? reliability (especially using a original spec piston) and fuel economy?