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them numbers sound wrong. aint that close to what a stock jug is ? cpi will work alot better if your ports are higher. Hi again. No, a stock jug is 180 exhaust and 122 transfers if i remember right. Here is the values from fransisco who wrote earlier in this thread, and his porting is slightly more...

what i ment is how long the ports are open in degrees after he raised them per EG instructions. i use degree wheel so that measuring crap is foreign language to me Hello! After what i have read that would give 186-187 deggrees on exhaust port and 125 degrees on transfers. maybe not the Exact number...

Thank you guys for all good info. After some thinking i will start with my PC-pipe and maybe shorten it a bit later about 2 inches. I talked to a tuner here and he said : Try the PC pipe first as it will give you a easy controllable bike, and if you want more top end shorten it to about 115cm tuning...

the cpi is not the way to go if you're trying to roll smoothly into the power Hello Roostius. I understand that it gives a hit on higher revs, but was thinking that it maybe would be smoother on powerdilivery out of corners where i use lower revs, but maybe it,s better to use a more moderate pipe. ...

The pipe cost me 307 euros, with shipping. You can buy it in http://www.cpiracing.com/store/index.php?act=viewCat&catId=10 . Roostius_Maximus did some testing with this exhaust comparing to the old FMF Fatty (some people says that it´s better than ProCircuit) and he found an improvement of 6 hp...

Back when I was ice racing in Canada a few years ago. We often had "soft" ice and it was a 1/4 mile oval with fairly tight corners. We found that too much power would result in excessive wheel spin when exiting the corners and because of this I was often able to pull on the 500s while on ...

Hello Fransisco! Thank you very much for your very detailed reply. It is very helpful. I have just ported my exhaust and raised it 3mm, and i am about to raise my transfer ports 1,5mm, so i will not be too far from your values i guess. I also use a PWK 41,5mm with a JD kit, power reeds and coolhead ...

hello guys! Johnny from sweden here. I have a 500 of course=). My bika has a regular portjob done to the intake side and the transition ports. I also have a Coolhead, PWK 41,5mm, ProCircuit exhaust and Power reeds. As i only use it for the street in the summer and for iceracing in the winter i would...