What type of clutch is this?

J

justin871

New Member
I recently purchased a Huasheng 49cc kit, was looking at getting the Gru-bee 4G 80t transmission, will it fit?

I've never seen this type of clutch before. If you google "Wacker RM75 clutch" you can find it online.
 

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Howdy Justin, welcome!

I don't have one to measure but am sure some one will chime in.

I like it, though. Lots of contact.

Am sure someone will chime in and enlighten us both.
 
Hopefully you got the 4g intended for a tapered shaft instead of a straight shaft. I like how much surface area that clutch covers. Do you know the engagement rpm for it?
 
Yes I did, it mated up perfectly. The clutch seems to engage around 2850rpm based on feel and fully locks up around 3400rpm. These are just first impressions and I will update after a few more rides. The clutch material seems a bit soft but the surface area is impressive.
 
It's engaging more around the 3000 rpm mark, with lockup at ~3450 rpm. This is just an estimation after my ride today. With my gearing (19.56:1) with 29 inch wheel the lockup is 15mph, so I try to stay above that figure during rides.
 
CrazyDan said:
Glad you understand how to keep your clutch alive longer. Had to explain to many folks why their clutch was lasting only 2 weeks max because they like to cruise at low speeds below lockup...
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Thanks for the info, now I know why my 49 cc 4 stroke clutch only lasted a month, can these clutches be rebuilt with heavier springs? I have been trying to find a better clutch because I don't ride very fast through town because there are too many people cutting me off and turning in front of me, other than that I cruise wot. B:)
 
My advice to get your clutch to engage at lower speeds is to get a larger rear sprocket. Will increase acceleration but lower your top speed. Odds are you are running the poorly geared cheap kits with the 3:1 transfer case. I would suggest a 56 tooth rear sprocket minimum if thats the case.
 
CrazyDan said:
My advice to get your clutch to engage at lower speeds is to get a larger rear sprocket. Will increase acceleration but lower your top speed. Odds are you are running the poorly geared cheap kits with the 3:1 transfer case. I would suggest a 56 tooth rear sprocket minimum if thats the case.
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My clutch engages on first take off,I noticed the spring side faces inward on the shaft,the long shaft,not the tapered one,is this right?
 
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