Fabrizi bore questions

[Dio Dawg]

Did they change the old 50mm FAB cylinder ports that was made to run with the ministroke FAB crank with the newer FAB bores? As fas as I know the port windows are the same they just corrected the piston and maybe head, if I'm wrong please correct me. If i'm right...why do I need a port map which i'm not messing with the port heights? SMH.

[LMH]

Smh if you didn't do a port map. What did you just throw it together and hope it worked? If so just say so.

[LMH]

At any rate, you should Always check your port timings when changing stroke. Or risk burning up your piston from bad scavenge and exhaust timing.
Also the "old" stroked cylinders were for 44.6 stroke not 44.1 like you say you're using. Port timings would be off by .5mm both ways if so and waaaaaaaaay off for the stock stroke. But you knew this right since you compared both the old and the new cylinders? Or are you just guessing?
I'm just trying to clarify what you did and did not do so if someone was to follow your build they know it will work for 100% certainty.

[Dio Dawg]

Don't ever assume. I don't expect anyone to follow my build. Every bike is different. In fact I don't want my bike to be like anyone else's bike. All I was trying to say when I started this thread was that the FAB cylinder would work with a mini stroke crank, then here you are with all these port maps and stuff...I was just keeping it simple. And my bike runs great !! But compared to my 72cc corsa w/ a ministroke setup = 76cc a difference in 10cc from my FAB ... the Corsa or even a MHR will put out the same power IMO. Don't get me wrong the FAB is a great bore maybe someone with better tuning skills could say its a Corsa/MHR killer but I honestly say they're very similar. And this is my opinion alone.

[LMH]

I've heard from a lot of people they're killer bores with the mini stroker fabrizi cranks. Wheel an is the first I've heard to use the stock stroke. Sounds like both are equally happy. I'm doing the same build as wheelman.
I'd like to do it with a 44.1 also on the next build.

[Dio Dawg]

Good Luck. And I would love to hear your build.

[Dio Dawg]

Like Ped said on Wheelman's post ... and until someone prove that the FAB can smash the Corsa... I agree that the Corsa, MHR, and FAB are very similar and because the FAB is 3mm bigger in size and cost more , it seems that it doesn't put out that much more being almost 10cc more..it makes the Corsa and a MHR a better buy than the FAB overall.

[sulfuracid]

I personally radar gunned a fabrizzi single ringleader with stock stroke crank in the low 80s mph. In my opion there is no replacement for displacement especially since its a bridged exhaust port it has more potential

[1man8scoots]

Like Ped said on Wheelman's post ... and until someone prove that the FAB can smash the Corsa... I agree that the Corsa, MHR, and FAB are very similar and because the FAB is 3mm bigger in size and cost more , it seems that it doesn't put out that much more being almost 10cc more..it makes the Corsa and a MHR a better buy than the FAB overall.

That guy doesn't show up very often. The fabrizi does indeed smash the corsa and mhr on power. Top speed has been 82.54 mph. I own 2 of them.

[Wheelman-111]

Greetings:

Dio Dawg a troll?! Perish the thought. The Fab is near and dear to me, but he's right; it's certainly stronger in the low end but not all that much faster. Bakaracer has video footage of his SE50 on the track and believable 80+ with the MHR - suitably modified of course.

Now I suppose a highly skilled tuner could in time get the Fab to go even faster - perhaps 1Man will see 90? But it's not yet been reported.

Still another nice thing about the Fab is how relaxed it feels in the lower end compared to the manic Corsa and even the MHR. It makes a lot more off-line and low-end torque (seat-of-bloomers assessment, yes...) without all the screaming drama. And so far I have no reason to believe it's any less reliable. I'd love to have all 3, actually.

[1man8scoots]

Oddly enough I have all 3, i have more than just 3. I don't believe any of them are bad cylinders but I do prefer the fabrizi over them all. Porting will set them apart and the fabrizi has a lot of room to grow. You can put a lot of power out of the fabrizi in stock form, so much that in stock form they will over take a mild ported corsa. The mhr is a very fun cylinder, the corsa won't die, and the fabrizi is a mix of them both but with all of the good. Minus it likes more juice than the 47s.

I don't think with the elite/fabrizi combo will hit 90. With the scorp I have to jet it really fat to maintain over 10k. On the spree I can hit 12k no problem, it will hit 90, but I'm shooting for 100.
I'm returning the ported fabrizi back to stock gears for the sprints and around town until I can get a day at Bonneville tho for top speed. It's not easy to stay at the posted speed limit signs with 6.89:1 gears and a ported fabrizi. Hard enough with the unported with 7.58:1s. Not really meant for riding on the streets as it is.
I think if I ported the fabrizi from you I could reach 85 safely. The spree has pirelli diablo tires rated for highway speeds, elite has metzler me1s. Tires are always the biggest concern.
Needless to say I have a long history with them all but the fabrizi and maybe it's just the honeymoon phase still but I love the fabrizi. Their pipe sucks, but the cylinder rocks.