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Post by 2TDave on May 11, 2015 20:59:44 GMT -5
The 103 is going to need taller gears. Got the stock 10.13:1. I'm thinking in the 8:1 range.
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Post by niz76 on May 11, 2015 21:04:55 GMT -5
Oh no!We'll be reading of a high speed chase of a dude on a scooter that the cops couldnt catch..Better be ready to file off the S/N's and do a quick repaint!! Haha I got the grinder and spray paint ready!!
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Post by moofus02 on May 11, 2015 21:05:24 GMT -5
Longcase might be tricky in that range.
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Post by 2TDave on May 11, 2015 21:09:50 GMT -5
That's what I'm afraid of.
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Post by niz76 on May 11, 2015 21:12:43 GMT -5
So far todays efforts have been a dud. I got a little sidetracked on the tune as when I had the clutch bell on the shaft re-checking this final drive ratio (it is 8 3/4 to 1) the Polini bell literally fell apart in my hand! Seriously! The center where the female splines are just cracked and fell right out of the center of the bell! So I tried using a stock clutch bell with the Polini clutch and it slipped pretty bad at takeoff- the Polini bell is smaller than stock. I then put a stock clutch and bell in- the one from my stolen Baccio scoot- that has 1.5k yellow clutch springs and a red 2k contra. Now it slips reeaalllly bad- revs to 8k at takeoff then I have to feather it back down to 6k until everything grips and then throttle back up again. I still have yet to get over 7500-8k while driving full speed and I'm at least 10 mph slower than the 11:1 gears hmmm. I wanted to just change the gears only and see what happened but now this clutch is throwing a wrench into things. grr....
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Post by moofus02 on May 11, 2015 21:16:01 GMT -5
Niz that's the same kind of crap that happens to Brent in the middle of a series of test runs. You're in good company
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Post by moofus02 on May 11, 2015 21:26:23 GMT -5
That's what I'm afraid of. May take a full set of gears p&s to get it done
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Post by niz76 on May 11, 2015 21:32:33 GMT -5
That's what I'm afraid of. May take a full set of gears p&s to get it done I don't remember reading of anyone running taller than the 10.13:1 gears longcase. Would this be uncharted territory??
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Post by moofus02 on May 11, 2015 21:38:46 GMT -5
I've got 9.25 for a Zuma depending on the stock secondary i use i could get that into the 8s but Zuma isn't like the clone motors
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Post by 90GTVert on May 11, 2015 21:48:57 GMT -5
Crappy turn of events because now we don't know if it's the load of trying to get those long gears moving or your clutch has issues. On the bright side, if the bell came apart that easy I'm glad it did it at hand rotation speeds and not spun up to whatever RPM it may turn.
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Post by niz76 on Jun 13, 2015 20:23:58 GMT -5
Yah- can't believe the Polini bell just came apart like that while I was checking the final drive ratio. Didn't even have the clutch and pulley on there- just the bell- slowly turning it by hand! My scoot is ripping pretty good right now but still slipping like crazy with this stock clutch assy installed. I just kinda ease into it at takeoff then let it rip after I get rolling a bit... I shaved my cylinder head. Updates to come!
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Post by niz76 on Aug 2, 2015 22:25:57 GMT -5
Ok fellas after talking about doing this forever, I'm finally digging in and going to change my durations on this cylinder! Still not 100% what the game plan is here but we'll know soon enough eh? I put my engine up on the operating table and decided to just confirm and see what my durations are as-is. Pretty mild at 180 exhaust, 122 transfer. I made a quick "how-to" vid showing how to find durations using the free printable degree wheel 90GTVert posted!
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Post by 'O'Verse on Aug 2, 2015 23:25:38 GMT -5
Just bought a flywheel puller after watching your video.
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Post by niz76 on Aug 3, 2015 0:08:49 GMT -5
Just bought a flywheel puller after watching your video. Sweet! Got something juicy planned?
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Post by niz76 on Aug 3, 2015 0:25:28 GMT -5
So here's how much I'll need to raise the exhaust port to get 190 degrees. Kinda hard to see, but it's the slight horizontal scratch above the exhaust port. I didn't measure but looks to be a few mm's.... Digging in to her now! Chips are flying! Here's the finished product! 190 degrees of exhaust duration! Now, for the transfers I plan to make the adjustment on the piston itself. I just don't see any way for me to get in there and do the work from inside the cylinder so I marked everything out on the piston... I only need to remove about 1mm or less to get the 130 degrees of transfer duration I'm looking for. Kinda sucks because I have the circlips in real nice with loctite and I trust them 100%. Maybe I can leave the piston intact and just make the adjustment slowly and carefully with a hand file? Hmm...
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