Corsa Porting

[burnt_toast]

Thinking about eeking more power from my setup, and porting comes to mind. Any of you guys ever done it on a DIO Corsa bore? I've heard they rip pretty good on jog setups.

In detail, what kind of tricks would work best on porting a Corsa?

Does anyone on here perform this as a service or have any good shop recommendations?

[Mini_Stroker305]

1man8scoots is the man to talk to when it comes down to porting. He is currently working on my Mina horizontal mini stroke Evo jog motor and has done multiple elite/dio motors. Man is good !

[1man8scoots]

I'm not giving out any tricks on porting but I will say this. Don't go over 129 on all 5 transfers and stay under 192 for exhaust. Anything over and the case and/or exhaust won't flow enough and you will see rpm but no power. I've gone too far many years ago and it was kind of funny.
If you dont have patience and a steady hand I wouldn't try porting. If you have both then you're in luck! I've done corsas for vespa p200 (still in the works), aprilia, piaggio, derbi, yamaha horizontals, and honda af16/18. If you're going to use a mini stroker the corsa or contessa is the way to go. I did the math and a mini stroked mhr is not realistic but the corsa can be ported just right to match.

[burnt_toast]

very nice. thanks for the info guys!

How does ported Corsa go with stock stroke vs. ministroke? Not sure how far I want to go, but did ministroke once before and didn't care for it too much, but paired with unported of course

[1man8scoots]

I've done a few mini (44.4 & 44.1) stroked ported corsa af16/18. It's the porting that makes the difference more than extra stroke. When porting a stroked always remember if you started with a high timed cylinder it will only go up in timing when stroking and it can get too high fast. I ran one of my ported corsa/mhr vs one of my 44.4 corsa I did for a friend and we're the same weight, he destroyed me from start to finish. I really enjoyed riding his bike also, if you let off the throttle while cruising and get back on it, you won't even feel a lag.
The life expectancy of a mini stroked engine is less than a proper stock stroked engine tho. Porting can increase usable power by a lot or make a lot of power in a shorter area. I always go for the latter. I don't operate my engines at low speed and if I plan on cruising around the city (which I never have time to) I ride my "street ported" bikes. In the end you could ride any style porting anywhere it just depends if you want to sound like you're racing everywhere.

[veedubh20]

Malossi Mo betta. I love jog replica bore.

[1man8scoots]

Malossi is the bottom of the barrel when it comes to bores. Just above tai bores in qc.