GTS OWNERS CLUB

AUTO-ANDY · Posted: Sun Jun 29, 2008 5:26 pm Post subject: my set up needs some help

can u help?
this is my set for my gt 125.
210 polini
upgear kit
polini variator and belt
malossi digibox
leovince exhaust.
it struggles to get up to 60mph and when going up hills even worse it dont feel much different than when it was standard 125 can you please advice me what to do next dont no if the exhaust is stopping it or rollers and clutch springs need doing. the rollers that are in it are the polini ones that come with variator.
so can you please help????????????????

and do i need to disconnect the battery then put it back on so the digibox works?
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Rhoodman · Posted: Sun Jun 29, 2008 5:54 pm Post subject:

Andy, what changes have you made to the carb mate?
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AUTO-ANDY · Posted: Sun Jun 29, 2008 5:59 pm Post subject:

none
no-one every mention the carb
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Rhoodman · Posted: Sun Jun 29, 2008 6:10 pm Post subject:

That's your problem then pal. It's like sticking a 180 kit on a PX125 and not changing the main jet.

There's only enough fuel being put in to get the bike upto 60. You need a larger main jet. Someone else on here may be able to tell you what size that is.

It might help using a free flowing air filter too.
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Craig E · Posted: Sun Jun 29, 2008 6:37 pm Post subject:

it not carb you dont need to upjet
its down to rollers you want to run about 11 gram rollers

this is my setup

polini 210
polini gear up
pm pipe
pm clutch bell
polini belt
std carb std jets with airbox
and i blocked the sas valve in the flywheel cover to richen the mixture up a bit

you only need a open filter with the malossi 34mm carb kit

this does 80 on std rollersi am putting a polini variator on tomorrow with 11 gram rollers as recomended by pm tuning should be good for 90ish mph
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POGUE MAHONE SC
Black GT 125
RUNNER 125 SOON TO BE REALLY FAST

AUTO-ANDY · Posted: Sun Jun 29, 2008 6:49 pm Post subject:

cheers craig let me no how u get on with polini variator
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Rhoodman · Posted: Sun Jun 29, 2008 6:51 pm Post subject:

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

Yeah it will need a upjet to some degree, its had a 68% increase in bore capacity, its impossible for the standard main jet to fuel a 125cc engine correct, and then also fuel a 210cc engine the same... it wont need much, maybe 5%-10%

Upjet and try slightly lighter rollers.... then maybe slightly stiffer clutch springs, but do the upjet and rollers too. Wink

AUTO-ANDY · Posted: Sun Jun 29, 2008 7:17 pm Post subject:

cheers thomas do u sell all the bits i need in ur shop?
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Craig E · Posted: Sun Jun 29, 2008 7:17 pm Post subject:

the majority shouldn't have to but every bike is diffrent
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POGUE MAHONE SC
Black GT 125
RUNNER 125 SOON TO BE REALLY FAST

CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

Blocking the SAS wont make much difference to fueling of the engine, its more related to weaking off the exhaust gases after the burning process to meet euro emissions...

... but anyway back to the point.... i would seriously get it jetted a little, its gonna be lean, and wont be helping power at all... your best to get it done on a dyno if possible, but if not basic setting up on the road will do.

AUTO-ANDY · Posted: Sun Jun 29, 2008 7:39 pm Post subject:

cheers for all your help
wot size jet should i go for? wot is standard
wot colour springs are they same as two stroke clutch springs and will 11gm rollers be good?
and last thing where can i buy all this stuff?
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AUTO-ANDY · Posted: Sun Jun 29, 2008 8:28 pm Post subject:

i think the person who owned the scooter b4 me down jetted because he put pipe on.
so wot size jet should i now put in?
and wot clutch springs
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CheekyThomas · Guvernor Joined: 18 May 2007 Posts: 1374

Its impossible to say what size jets it needs, theres no golden number... the engine needs as much fuel as it needs, its a complete variable Wink

When i derestrict bikes and upjet them, i can do one and need a 60 jet, but the next will need a 68, even though both are the same make,model and age...

If you dont get it done a rolling road, so they can see what it needs, you have to take a educated guess from how it rides, go too big so it doesnt do damage, and then work down with a selection of jets until its perfect...

Until its jetted right clutch springs should be ignored, you need the engine to be running right before you worry about gearing changes...

AUTO-ANDY · Posted: Wed Jul 02, 2008 7:26 am Post subject:

i need to buy some jets and the carb got jetted very low by previous owner so need standard size and maybe one up? anyone no where i can get one
soon as ?

craig how did u get on with the polini variator and did u use the rollers in the variator?
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