2011 Jonway YY250T "Serenity" Upgrades By chibs (Read 1,624 times)

[chibs]

Evening all,

Looking to do some upgrades/modifications to Serenity soon and I need some guidance/advise. I've got some new tires coming but I want to upgrade some clutch and variator parts while I'm in there...

Sliders - I want to drop a few grams to improve higher rpms but not sacrifice too much top end. Any advise/info on a good weight to drop to would be much appreciated. I was looking at 18s? (I weighed them the last time I opened her up, I think they were 21g.)

Clutch Springs - I'm still getting low rpm vibrations from the arms not catching the clutch bell good enough (glazing). Would using lower tension springs help the arms engage faster? If so, what's a goos place to get some for a 250cc? I can only seem to find them for 50cc.

Handles/Grips - would like to get something more comfortable, maybe anti-vibration, not sure what size/length to get.

Brakes - about 1500 miles in and they are starting to squeak and get harder to stop. What kind do I need for upgrades? Is there good brand to get?

Thanks all. I appreciate any/all info.

JW

[Bashan]

I've never heard of the strength of the clutch arm spring causing a vibration or glazing because of a particular strength. The theory is that once you reach the RPM spec it engages, end of story. Maybe you've had a defective clutch from the git go? In any event, Here are the 18g sliders from KidNME, and some clutch springs. Tom is the owner and a CVT specialist, I'd call him and discuss your problem with him. You also may want to call Mike at BPNW, Greg at Mainely Scooters, or Dave at Absolutely Scooters. They're all great guys and would love to help you out selecting the right parts including brakes.

[chibs]

Excellent stuff. Thanks Bashan.

Yeah the clutch problem seems to be common with the YY250T. The pads on the arms heat up and get slick, causing them to slip until higher rpms. It's very annoying after a long ride in stop and go traffic.

[Bashan]

I have heard that about the YYs. Oddly, I have a CF Moto Fashion with the vertical engine and the CVT has been flawless. I'm not sure what the difference is on them. I'm coming up on a 1,000 mile service and I need to pull the CVT cover to change the transmission oil (nice huh?). I'll check the clutch out carefully and see if anything jumps out at me. If the belt looks good I won't pop the clutch bell though, I promised the wife I wouldn't tear this scooter all to hell until it needed something done. Rich

[chibs]

Yes but dont they always need "something" done?

Put an email out to Mainley Scooters asking about his Torque Springs/Clutch Springs. Hoping I'll hear back from him soon.

[chibs]

Have another question for the 250-B /YY250T owners. Looking to upgrade the stock windshield to a more sturdy taller one. I've seen posts about a Givi and Cee Bailey replacements but I can't seem to find it available. The wind noise is really bad with the wind going straight into my face shield. Anyone have a preference or know where I can find one?

Thanks.