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Vinnie
Joined: 29 Nov 2008
Posts: 8
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 Posted: Sat Dec 13, 2008 9:38 pm Post subject: 4 Stroke tuning - what can be done? |
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I'm guessing the majority of people on here have come from trad' 2 stroke scoots. We've probably all tuned em to some degree.
Now we're riding 4 strokes. Whole new technology. What can we do?
We've got after market variators, rollers, pipes. Malossi offered a high lift cam for the GT, haven't heard if it's compatible with the GTS. We've played with larger tyres, adding screens (both to good effect).
What else can we do?
There was something on the net soon after the introdction of the GT200 about a CAD design for a supercharger (or turbo, I can't remember which) for the leader engine but it would've cost thousands to develop.
Oz is a respected tuner of race cars and I've seen him offer to reprofile heads (experimentally).
A mate of mine (Darren English if anyone knows him) who'd love to play with my scoots valves.
So what I'm really asking is what else can we do? Where can we go to learn more? Is there anyone out there with the knowledge already? Oh, and what's it likely to cost?
Not asking too much am I?
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smirnoff
Site Admin
Joined: 14 May 2007
Posts: 1125
Location: On the bouncy castle in my head.
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| Posted: Sun Dec 14, 2008 9:51 am Post subject: Re: 4 Stroke tuning - what can be done? |
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| Vinnie wrote: |
There was something on the net soon after the introdction of the GT200 about a CAD design for a supercharger (or turbo, I can't remember which) for the leader engine but it would've cost thousands to develop.
Oz is a respected tuner of race cars and I've seen him offer to reprofile heads (experimentally).
A mate of mine (Darren English if anyone knows him) who'd love to play with my scoots valves.
So what I'm really asking is what else can we do? Where can we go to learn more? Is there anyone out there with the knowledge already? Oh, and what's it likely to cost?
Not asking too much am I?
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Cam is compatible, as is the malossi valves and valve springs. Re-profiled of gas flowed head is a lot of money for very little gain. Turbo or supercharger would not be straightforward as it is injection and not carb so would need a custom map, bigger injector,throttle body.
The best person to talk to is Russ on scooter scene or Rhoodman on here, Russ's done most of it and considdered lot of other options. At the end of the day there is still the rev limiter to call a halt on it all.
There is a far more cost effective way I can make mine go quicker, and all i've got to do is loose five stone  
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Blackpool Paul
Guvernor
Joined: 28 May 2007
Posts: 531
Location: Blackpool
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| Posted: Sun Dec 14, 2008 10:02 am Post subject: |
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Yep, Im in the same boat, but it didnt stop you making improvements to yours, its just our nature, if Piaggio brought out a rocket booster someone would want Warp drive
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GTS250 its the future!!! A club wi owt a name sc. Bamberbridge. |
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smirnoff
Site Admin
Joined: 14 May 2007
Posts: 1125
Location: On the bouncy castle in my head.
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| Posted: Mon Dec 15, 2008 1:48 pm Post subject: |
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| Blackpool Paul wrote: | | if Piaggio brought out a rocket booster someone would want Warp drive |
Pmsl
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scooterman66
Inspector
Joined: 18 Sep 2008
Posts: 189
Location: looking at girls bottoms
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| Posted: Mon Dec 15, 2008 2:11 pm Post subject: |
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Just be happy with looking cool. Thats what riding a scoot is all about, im getting mid 80 s easily on my gts 300, thats fast enough for me 
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D.C.F.C. Come on u Rams!!!! |
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smirnoff
Site Admin
Joined: 14 May 2007
Posts: 1125
Location: On the bouncy castle in my head.
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| Posted: Mon Dec 15, 2008 11:23 pm Post subject: |
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| scooterman66 wrote: | | Just be happy with looking cool. Thats what riding a scoot is all about, im getting mid 80 s easily on my gts 300, thats fast enough for me |
Top speed of any scooter.....In the words of Robert Smith
http://uk.youtube.com/watch?v=ri8fQ-7eVAY
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scooterman66
Inspector
Joined: 18 Sep 2008
Posts: 189
Location: looking at girls bottoms
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| Posted: Tue Dec 16, 2008 9:05 am Post subject: |
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I reckon the stone roses nicked a few rifts of bob and the lads, cracking tune!!
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kevin..in
Joined: 30 Aug 2008
Posts: 17
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| Posted: Mon Dec 22, 2008 1:56 pm Post subject: |
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any update on this thread?
anyone with any links to 4 stroke leader/quasar tuning/head work? |
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MikeHolland
Inspector
Joined: 26 Jul 2007
Posts: 150
Location: Sydney, Australia
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| Posted: Mon Dec 22, 2008 11:40 pm Post subject: |
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For higher top speed you want a small windscreen and a larger rear tyre. But the windscren will generate a lot more wind noise.
For better acceleration generally you want an aftermarket variator - J.Costa or Polini with Dr.Pulley sliders.
For faster take-off fit stronger clutch springs - I recommend Malossi yellow ones.
An exhaust (PM?) will give a tiny bit more speed and power, but is mainly for looks and noise.
The Malossi camshaft gives a bit more power, and can be fitted quite easily without removing the engine.
I would say the mods that give the most results are the windscreen and J.Costa variator.
Mike
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