Best gearbox to replace hoot

[bdial]

I have an HS 4 stroke with the "new" single chain hoot. I keep burning up clutches. I would like to replace the hoot with a good gearbox...durability is more important than price. I understand that my motor has a short shaft and that limits my possibilities. I've researched the forums and haven't really found a good answer to my question. Don't mind being contacted by vendors if there is an answer to my problem.

 

[The_Aleman]

Burning up clutches? What ratio is the gearbox and what sprockets are you using?

 

[bdial]

The gearbox is the single chain hoot (new hoot) and I'm told it's 3:1 or 4:1. Rear sprocket is 44T (Grubee GT1 bicycle). I think I'm burning up the clutches because I don't run the motor wide open. I live in a small village and use the bike for cruises around town and to the post office, etc. I think the centrifugal clutch never fully engages.

 

[The_Aleman]

You got it. If you have a 4:1, the clutch won't fully engage until roughly 13MPH. If you have 3:1, then 17MPH.
You could use a larger rear sprocket or of course, a different gearbox.

I'd recommend a 5:1 4G.

 

[bdial]

Good information. Thank you.

 

[bdial]

Aleman:

I'm having difficulty finding a vendor who sells the Grubee 4g alone, i.e., without the complete kit. Any recommendations?

 

[The_Aleman]

I would try calling the good people at bicycle-engines.com and asking them. 1-800-514-8435. They sell the "Honda" 4G by itself, I'd imagine they'd also sell the regular 4G that you need.

 

[bdial]

No joy at Bicycle-Engines.com. I'll keep plugging away at it.

Bill

 

[The_Aleman]

Sorry I can't help with the HS 4G. It seems no one is carrying the gearbox by itself anymore.

 

[scotto-]

I agree with Aleman, the 4G would be the best choice imho and would further bug bicycle-engines.com a bit more as they used to sell them stand alone not too long ago. I've had no probs with them and would recommend you give them another try.....it's worth a try, good luck.