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Johnny Alucard
troop
Joined: 17 Sep 2008
Posts: 47
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 Posted: Mon Jan 12, 2009 7:24 pm Post subject: Not GTS!! ...but Vespa Granturismo |
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Hi all,
Didn't know where to post this one, not really GTS but related. Maybe someone out there can help.
A friend has fitted a Vespa GT 200 top end to a GT 125 engine.
The engine has been rebuilt, the only difference being the 200 top end and the rollers, which for a 125 are 7.5 grms. he has replaced them with 15 grms. rollers.
The bike accelerates really well (nearly as good as my 300 GTS), but tops out at about 110 Km/h whilst sounding extremely over revved.
It definitely doesn't feel like you'd want to do any long distances at that speed/configuration.
Any ideas what should/could be done to correct this??
Cheers in advance,
Mick |
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CheekyThomas
Guvernor
Joined: 18 May 2007
Posts: 1374
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| Posted: Mon Jan 12, 2009 7:36 pm Post subject: |
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| A gear up kit would be the best and easiest option... about £60 retail from malossi. |
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Johnny Alucard
troop
Joined: 17 Sep 2008
Posts: 47
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| Posted: Mon Jan 12, 2009 7:50 pm Post subject: |
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Cheers for the quick reply Cheeky. Is it simply just "taller gearing" straight out of the packet or does it involve trial and error testing (a bit like when setting up a Lambretta gear box)??
Mick |
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CheekyThomas
Guvernor
Joined: 18 May 2007
Posts: 1374
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monty9120
Guvernor
Joined: 15 Nov 2007
Posts: 861
Location: North London
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| Posted: Mon Jan 12, 2009 8:02 pm Post subject: |
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it should show higher speed then that tbh my mates 125vx was nearly as fast as my 200 vxr 130kms roughly
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GILERA NEXUS 500
DANGER HIGH VOLTAGE!!!!!
NORWICH BROADSMEN SC |
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Johnny Alucard
troop
Joined: 17 Sep 2008
Posts: 47
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| Posted: Mon Jan 12, 2009 8:07 pm Post subject: |
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Cheers Cheeky, I'll pass the refs. on to my mate that'll make a happy man in Bordeaux!!
regards,
Mick |
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CheekyThomas
Guvernor
Joined: 18 May 2007
Posts: 1374
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| Posted: Mon Jan 12, 2009 8:07 pm Post subject: |
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| ... standard 200 rollers are 10.3grams. |
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AIRMECH
Inspector
Joined: 05 Jan 2008
Posts: 260
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| Posted: Mon Jan 12, 2009 9:21 pm Post subject: |
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you also need to change the carb or pilot and main jets from the 200 carb 
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