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Re: Italian GP200 Top Speed
Posted: Fri Aug 26, 2016 7:04 pm
by shocky
Morgan wrote:Lamaddict wrote:Ref Scootering Second Edition. Probably taken from original literature
GP 200 Power Output 11.74hp @6.200rpm Max Speed 68 MPH. Seems out.
GP 200 (SIL) Power Output 11.9hp @6.200rpm Max Speed 74 MPH. Seems way out. Although we know the barrels were 'stage 4' plus the SIL Clubman and bigger main jet.
TV175 Power Output 8.75hp @5.300rpm Max Speed 64 MPH. Not far off.
I guess we could also make allowances for weight and modern fuel. I'm 14,7 Stones.
I thought the Italian and Indian GP final drives were the same (5.2:1 or thereabouts) seems odd they reach different speeds with the same drive ratios
The Indian one has a stage 4 speedo
Re: Italian GP200 Top Speed
Posted: Sun Aug 28, 2016 9:05 pm
by corrado
Chris in Margate wrote:Youre not far off. Every ride out guys say; Wow Chris you must have been doing 75mph when you came past because we were doing 70mph?
I say NO, I was doing 59 mph when I came past and then I took it up to 70mph.
Had that on the way home from IoW a few years ago. Pulled in at services for fuel just as another couple of lads were about to leave. They said they'd wait for me if I wanted them to, so I asked them what speed they were riding at, "65 mph" they said, "oh well you carry on then, I'm only doing a steady 55". Then about 20 minute further up the M6 I passed them doing 55.
Re: Italian GP200 Top Speed
Posted: Sun Aug 28, 2016 11:27 pm
by Chris in Margate
Ain't that just the truth !
Re: Italian GP200 Top Speed
Posted: Mon Aug 29, 2016 10:58 pm
by Lambretta Sash
Lamaddict wrote:Ref Scootering Second Edition. Probably taken from original literature
GP 200 Power Output 11.74hp @6.200rpm Max Speed 68 MPH. Seems out.
GP 200 (SIL) Power Output 11.9hp @6.200rpm Max Speed 74 MPH. Seems way out. Although we know the barrels were 'stage 4' plus the SIL Clubman and bigger main jet.
TV175 Power Output 8.75hp @5.300rpm Max Speed 64 MPH. Not far off.
I guess we could also make allowances for weight and modern fuel. I'm 14,7 Stones.
Those are flywheel figures
Re: Italian GP200 Top Speed
Posted: Wed Aug 31, 2016 2:58 pm
by Lamaddict
Thanks for the clarification on the BHP. The top speed figures are still wrong, I suggest.
I put a skimmed head on mine over the weekend, it pepped it up a bit but haven't got a sat nav speed yet. Apart from that, everything else is totally standard apart from the 120 main jet. I really like standard scoots now but as I've said the top speeds stated weren't right, unless the petrol make a bigger difference then etc.
Re: Italian GP200 Top Speed
Posted: Wed Aug 31, 2016 10:49 pm
by Lambretta Sash
I put std tv175 ser 3 on dyno unit today 52mph 7.4 hp at rear wheel.
Its on 20mm carb Indian big bore with remote filter.
The best I've seen is Gt200 home tune with 20mm carb and outrigger pipe that hit 65mph, will put on dyno at some point .
One day in time I'll put my gp 200 std top end back on and see what it does, that had 58k on std piston and exhaust port so coke up it was 10 mm dia.
Re: Italian GP200 Top Speed
Posted: Thu Sep 01, 2016 4:06 am
by Lamaddict
^
Put the standard exhaust back in a, it could go quicker and near the Lambretta stated figure when they can out. My Tv175 flies.
Re: Italian GP200 Top Speed
Posted: Thu Sep 01, 2016 6:18 pm
by Spanish Fly
Top speed is purely dependant on colour!
Re: Italian GP200 Top Speed
Posted: Thu Oct 06, 2016 5:30 pm
by Lamaddict
Update. Got 63.6 MPH GPS out of the GP on the flat. Slightly quicker than the TV175
Re: Italian GP200 Top Speed
Posted: Sun Oct 09, 2016 5:12 pm
by soosh
Lamaddict wrote:^
Put the standard exhaust back in a, it could go quicker and near the Lambretta stated figure when they can out. My Tv175 flies.
I've often wondered on a std motor if a clubman makes any difference at all.