2019 tt250 supermoto issues.

_freakazoid_ · 03-01-2021, 12:54 PM

Hello all.

I recently did a supermoto wheel swap on my tt250. I looks great and performs great! I do have a problem. The 4.5 inch wide rim is so wide that I'm having clearance issues on my chain. I spaced out the rear sprocket and I have JUST enough clearance to ride but the chain does touch the tire occasionally just from normal chain bounce.
My questions are:

Does anyone make an offset front sprocket for our bikes?
If not what other brands would be compatible?

Also, I found a honda monkey offset sprocket that looks right in pictures but it's for a 420 chain, would that be a problem?

TheChairman · 03-01-2021, 02:30 PM

You should be able to call CSC about this, if it's the kit they sell.

mtiberio · 03-01-2021, 06:09 PM

stock chain is very poor quality. Mine was wagging side to side a bunch. Replaced with quality chain. Problem solved.

RedCrowRides · 03-01-2021, 08:27 PM

^What mtiberio said.

Megadan · 03-02-2021, 03:24 AM

It's a bit of a pain to tighten the bolts down, but you can flip the front sprocket so that it sits on the outside of the retaining ring groove. That will move the front sprocket outward roughly 1 sprocket width plus the little bit of the retainer width. Might not be a rocket science solution, but why use a scalpel when a hammer can do the job? Should help with alignment with the spaced out rear sprocket at least.

I had to do this with my first Hawk because the chain alignment was always off because the groove was machined too far inboard on the countershaft. After doing so it was much much better aligned.

_freakazoid_ · 03-04-2021, 11:45 AM

Megadan...

You're a genius!

Also, I went ahead and ordered the Honda monkey sprocket but its coming all the way from Japan so it'll be a while. I'll keep everyone posted.

Megadan · 03-04-2021, 02:17 PM

In order to use a 420 front sprocket you will also need a 420 chain. 428 chain and 420 sprockets don't really work together

_freakazoid_ · 03-05-2021, 12:07 PM

Upon thinking about you suggestion I decided to modify your idea. I bought another standard front sprocket. And my idea is as follows:

Cut OLD sprocket so size and shape are approximately that of the retainer clip. Drill out the threaded holes on the NEW sprocket so the bolts can pass through. Install cut sprocket first then retainer clip and then the outer sprocket the chain will ride on. After bolting everything together I still have plenty of contact with the splines of the output shaft and I now have moved my sprocket our 3/8" giving me the clearance I was looking for.

Megadan · 03-05-2021, 03:13 PM

Quote:

Originally Posted by _freakazoid_

Upon thinking about you suggestion I decided to modify your idea. I bought another standard front sprocket. And my idea is as follows:

Cut OLD sprocket so size and shape are approximately that of the retainer clip. Drill out the threaded holes on the NEW sprocket so the bolts can pass through. Install cut sprocket first then retainer clip and then the outer sprocket the chain will ride on. After bolting everything together I still have plenty of contact with the splines of the output shaft and I now have moved my sprocket our 3/8" giving me the clearance I was looking for.

That is actually a similar idea tp what I had when I was running a flipped sprocket. Basically make the retainer a sandwich plate. This makes sprocket removal/install a bit easier, and you are also doubling the spline contact area, which should have some benefits as well.

_freakazoid_ · 03-12-2021, 07:24 PM

I wanted to let you know the plan for the sprocket spacing worked perfectly. The metal on the sprocket was WAY harder then i was expecting. I broke one cobalt bit and over heated another just drilling out the threaded holes and used up an entire cutting wheel trimming it down. But it all went together easily after that and now the chain is straight and doesn't touch the tire!

I got to ride it about 30 miles today. MAN it corners SO much better now it's like a totally different bike!

Anyway, thanks for the input, it helped a lot!

03-01-2021, 12:54 PM	#1
_freakazoid_ Join Date: Jan 2020 Location: Lake Co. California. Posts: 14	2019 tt250 supermoto issues. Hello all. I recently did a supermoto wheel swap on my tt250. I looks great and performs great! I do have a problem. The 4.5 inch wide rim is so wide that I'm having clearance issues on my chain. I spaced out the rear sprocket and I have JUST enough clearance to ride but the chain does touch the tire occasionally just from normal chain bounce. My questions are: Does anyone make an offset front sprocket for our bikes? If not what other brands would be compatible? Also, I found a honda monkey offset sprocket that looks right in pictures but it's for a 420 chain, would that be a problem?
	0

03-01-2021, 06:09 PM	#3
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	stock chain is very poor quality. Mine was wagging side to side a bunch. Replaced with quality chain. Problem solved. __________________ 4 time WERA SuperVintage Roadracing National Champion, SCTA Land Speed Record Holder, 3rd AMA Motorcycle GP of Miami
	1

03-01-2021, 08:27 PM	#4
RedCrowRides Join Date: Jun 2018 Location: Florida Posts: 759	^What mtiberio said. __________________ 2001 Mustang GT 2004 Sportster 2018 VADER 2020 Orion RXB250L
	0

03-02-2021, 03:24 AM	#5
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,991	It's a bit of a pain to tighten the bolts down, but you can flip the front sprocket so that it sits on the outside of the retaining ring groove. That will move the front sprocket outward roughly 1 sprocket width plus the little bit of the retainer width. Might not be a rocket science solution, but why use a scalpel when a hammer can do the job? Should help with alignment with the spaced out rear sprocket at least. I had to do this with my first Hawk because the chain alignment was always off because the groove was machined too far inboard on the countershaft. After doing so it was much much better aligned. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	1

03-04-2021, 02:17 PM	#7
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,991	In order to use a 420 front sprocket you will also need a 420 chain. 428 chain and 420 sprockets don't really work together __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

03-01-2021, 02:30 PM	#2
TheChairman Join Date: May 2020 Location: Philadelphia Posts: 115	You should be able to call CSC about this, if it's the kit they sell.
	0

03-04-2021, 11:45 AM	#6
_freakazoid_ Join Date: Jan 2020 Location: Lake Co. California. Posts: 14	Megadan... You're a genius! Also, I went ahead and ordered the Honda monkey sprocket but its coming all the way from Japan so it'll be a while. I'll keep everyone posted.
	0

03-05-2021, 12:07 PM	#8
_freakazoid_ Join Date: Jan 2020 Location: Lake Co. California. Posts: 14	Upon thinking about you suggestion I decided to modify your idea. I bought another standard front sprocket. And my idea is as follows: Cut OLD sprocket so size and shape are approximately that of the retainer clip. Drill out the threaded holes on the NEW sprocket so the bolts can pass through. Install cut sprocket first then retainer clip and then the outer sprocket the chain will ride on. After bolting everything together I still have plenty of contact with the splines of the output shaft and I now have moved my sprocket our 3/8" giving me the clearance I was looking for.
	0

03-12-2021, 07:24 PM	#10
_freakazoid_ Join Date: Jan 2020 Location: Lake Co. California. Posts: 14	I wanted to let you know the plan for the sprocket spacing worked perfectly. The metal on the sprocket was WAY harder then i was expecting. I broke one cobalt bit and over heated another just drilling out the threaded holes and used up an entire cutting wheel trimming it down. But it all went together easily after that and now the chain is straight and doesn't touch the tire! I got to ride it about 30 miles today. MAN it corners SO much better now it's like a totally different bike! Anyway, thanks for the input, it helped a lot!
	1