Thinking of upgrading HS 4 transmission





Joined
May 21, 2014
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#24
Bakeno mentioned something about an internal idle tensioner. Be great to see how that was done.

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I'm going to take a guess it involves some DIY fabrication, high density polyethylene rubbing blocks and a spring or tensioning device You'll have to disassemble the gearbox and probably do some drilling and fitting. I'd get rid of the grease that Bike berry packs into the case, seal the edge gasket with Hypalon, install a fill hole/ plug and run ATF. Grease shouldn't be used in a chainbox that turns at high speeds.
 



Joined
May 14, 2016
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#27
Ok guys, just got the 4G dual chain trans. Only problem now is....the RPM is just way too high.... over 6,ooo RPM in fact.

What could it be ? Carb adjustment ? Worn clutch pads ? What ??
 

KCvale

Motorized Bicycle Vendor
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#28
Ok guys, just got the 4G dual chain trans. ??
There no such thing as a chain drive 4G, the 4G is a single toothed belt pulley that is made by Skyhawk, that 2 chain gasbike gearbox I call a Hoot is just junk.
What exact engine and transfer case are running again?
 


Joined
May 14, 2016
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#30
Check your idle speed!
Made the carb and idle speed adjustment, but the engine can still only do 18 mph...at 6500 RPM...which sucks. Perhaps the dual chain trans would work with a shifter. Anyway, I went back to the old single chain trans, and a far more sensible ride going 25 mph at 4400 RPM.

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CrazyDan

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#32
Sure you can JS the 2-chain drive to the right and use the bikes gears, but that doesn't help the fact that hoot won't hold up long.
The dual chain has bearings for the shafts to ride in the cover, the single chain is the super crappy one commonly referred to as the hoot. Either one you gotta deal with chain stretch, but the true hoot wears out and the output shaft gets major play.
 

KCvale

Motorized Bicycle Vendor
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#33
The dual chain has bearings for the shafts to ride in the cover, the single chain is the super crappy one commonly referred to as the hoot. Either one you gotta deal with chain stretch, but the true hoot wears out and the output shaft gets major play.
I think I got like 5 HS 142F-1G engines from gasbike years back, they came with that crappy hoot with 2 nonadjustable chains but the deal was a great price on the engines.
The bikes got Grubee 4G's ;-}
 


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