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UpGeared Aero

Posted: Mon Nov 09, 2009 5:55 pm
by Wheelman-111
AeroRob axt:
or should i do it all at once since the taller gear would keep revs down for break in?
Actually you'd think it so, but it ain't. Remember the Variator? Once the clutch engages, you tune the variator to hold optimal RPM regardless of the gears installed back there. If anything, you may find that increasing RPM allows the engine to deal better with the tall final drive. I was running a stiff spring and 5.5s IIRC.

I think it might be better overall to break it in with stock gears first, and GO EASY on the throttle above 35MPH.

Re: Aero performance question..

Posted: Mon Nov 09, 2009 11:39 pm
by aerorob
ok. so ill keep 9 grams in it for break in and stock gears. should i run a premix in addition to my oil injection?
and also, after i break it in would i be able to just use stock oil injection, or would i need to always premix?
one more Q...malossi or polini for the BBK? i plan on using it with the tall malosi gears.

Re: Aero performance question..

Posted: Tue Nov 10, 2009 12:01 am
by Wheelman-111
Greetings:

You'll have to decide for yourself, but what I did was add 60:1 premix to the tank and retained the pump. I have since concluded that the ratio needs to be closer to 75:1, but more oil is certainly safer than less, especially for break-in. THe pump supplies adequate oil for a 50cc demand. When the engine starts inhaling 65cc per stroke, you must find a way to supply at least a bit more oil. See the Dr. Spock thread.

I felt my Malossi build was stronger than the Contessa Polini, but the Malossi had extensive case porting I did. It also had an O-ringed cylinder head thanks to Scooterwerx's great skills. It actually began without a base gasket - just lapped the cylinder to the case and used Permatex copper. However that combined with the gasketless head was too much compression for a daily rider. It's the only time the starter struggled to turn it over - about 175 PSI measured cold. I reinstalled the base gasket later on; that's one nice thing about an o-ringed head - permits disassembly without having to chase down a head gasket every time.

The Polini looked like high quality, and it was an easy bolt-on job. I could have matched the case ports on it too, but it was my first assembly and, well... I knew even less than I know now. Both survived my tuning "skills" very well :oops: . I think you'll be happy with either one. BTW I have a leftover 47mm gasket for either bore kit if you need.

Re: Aero performance question..

Posted: Tue Nov 10, 2009 9:21 am
by aerorob
holy smokes 175 cold compression... i think i might go with polini because i have bought from daywot before and he might combine shipping on a couple other things ill need at the time
thanks!

Re: Aero performance question..

Posted: Wed Nov 11, 2009 1:51 pm
by aerorob
Random question i hope someone knows,
as for kickstart levers, will any honda splined kickstart lever fit on the splined shaft? the kit im looking at doesnt come with a lever, so i am looking on ebay and found a nice lever that is advertised to fit on honda pit bikes. would the splines match up?
thanks!

Find A Rhyme for Spline

Posted: Wed Nov 11, 2009 2:39 pm
by Wheelman-111
Greetings:

Interesting question. Honda-san's very frugal and likes one-size-fits-all whenever possible.

I actually just called my Deepinnaharta Honda Dealer to axt Crusty, the Senior Parts Dude. We agreed it's 86.29% certain that the splines & shaft diameters are universal for any 50-175cc Honda of any vintage. However the shape of the kickstart lever will vary. You need to be sure the kicker you get won't foul the side panels or belt cover somehow. Also, since most motorcycles kick on the right, the pedal may fold the wrong way for Ergonomically Correct Kickage.

Otherwise go for it. :nervous:

Re: Aero performance question..

Posted: Wed Nov 11, 2009 2:47 pm
by aerorob
thanks for the help!