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Post by mauibird on Apr 24, 2015 4:43:56 GMT -5
this is with my old set up, on da flats, no wind, max speed-notice the calories burnt  |
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Post by mauibird on Apr 24, 2015 5:09:16 GMT -5
I've never checked durations before. What would I adjust for? I usually set the piston flush with the transfer ports. Then raise the exhaust port 1-2mm, then check compression and adjust head gaskets to dial in the compression. If I remember correctly on my new, untouched, replica cylinder I had 155psi with the full circle rhq crank (kickstarting it till it maxed out- and the last time I checked after lots of use it is running strong at 135ish ). Where should I be compression wise with this cylinder? This is intended as a street machine, running Ethanol free 91 octane(best pump gas available, where I'm from)
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Post by 2TDave on Apr 24, 2015 6:23:01 GMT -5
There's a good write up in the tech section on checking durations. I use the alternative calculating method explained at the end. 130-132 and 190 is what I was recommended on my 103cc build. Had to do some porting and shaving to get close. It would make me nervous to start opening up a port on an aluminum cylinder. Nickasil chips.
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Post by mauibird on Apr 25, 2015 6:04:52 GMT -5
I asked my scooter guru, and he'll port the cylinder for me. He's done 100's of aluminum bore's and has built most of the fast bikes on the island. I don't think he uses a degree wheel though, but I trust him.
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Post by 2TDave on Apr 25, 2015 6:35:06 GMT -5
Cool. I'm not sure how you'd know how much material to remove without a wheel but I'd be real interested in learning his process for porting an aluminum cylinder. A member told me he used diamond burrs on his but I wasn't comfortable trying it on a new cylinder. Anyone got a junk aluminum cylinder I can practice on?
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Post by mauibird on Apr 26, 2015 3:33:51 GMT -5
It looks like he uses a 1/2 head, carbide with a rounded end. I asked if he turns down the speed, he said he just rips em. Could be a guru secret though or decades of experience. I'll be involved with the porting process. I'll probably find 190 exhaust duration and mark a line for him. Then I'll play with the piston to get transfer durations dialed in.
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Post by 2TDave on Apr 26, 2015 6:05:45 GMT -5
The scooter scene is much larger in Hawaii. I know there are some serious tuners over there.
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Post by mauibird on Apr 26, 2015 23:07:22 GMT -5
I love hawaii = year round riding. No winter/down time to build though.
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Post by 2TDave on Apr 27, 2015 4:02:35 GMT -5
I hear you. Im in South Florida.  |
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Post by mauibird on Apr 28, 2015 4:03:45 GMT -5
new tool in today. Gonna remove that pesky transmission bearing…  |
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Post by mauibird on Apr 28, 2015 5:12:59 GMT -5
Of course…the smallest collet is a hair too big. I'll grind it down to make it work, uggh!
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Post by mauibird on Apr 29, 2015 17:53:59 GMT -5
SMALL VICTORY TODAY!!  BIT THE BULLET AND CUT OFF THE STEERER STOPS  PRESSED OFF THE LOWER/BOTTOM BEARING RACE  NOW I CAN PUT THE OLD HONDA ELITE "E" LOWER/BOTTOM STERING RACE, AND IT ALL SHOULD WORK
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Post by mauibird on Apr 29, 2015 17:57:16 GMT -5
THAT WAS NERVE RACKING!
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Post by mauibird on Apr 29, 2015 18:02:10 GMT -5
I THINK I'M GOING TO ORDER A BRAND NEW LOWER/BOTTOM BEARING RACE INSTEAD OF USING THE OLD ONE OFF THE ELITE FORKS THAT I HAVE. IT WAS TOO HARD TO GET THE LAST ONE OFF. PLUS, I DON'T WANT TO HACK 'EM UP TO GET TO IT. I LIKE HAVING THEM FOR MOCK UP REASONS. SO I WAIT ANOTHER WEEK FOR THE MAIL. THATS HOW MY PROJECTS ALWAYS GO, 1 WEEK AT A TIME.
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Post by 2TDave on Apr 29, 2015 18:54:04 GMT -5
Yep one week or part delivery at a time. Unless customs gets involved. That's when the aggravation begins.
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