Sprockets and Chain Interference

Painlesstom · 02-19-2019, 11:34 PM

Right off the bat I wanted to put the 17/45 sprocket combo on since all of my riding will be on road. Everything fit fine and it worked great. Ordered an X-Ring chain (DID 428VXX130FB Chain Pro-Street X-Ring) which arrived today, but being a touch wider it hits the engine case right in front of the sprocket.... Didn't want to risk grinding through anything critical, SO I put the stock chain back on and ordered a 16/40 sprocket set. If it's too low I'll put the 15 on. All the reading and videos I've watched about these bikes and all the upgrades, I'm surprised nobody else has run into this issue.

Megadan · 02-19-2019, 11:38 PM

As far as I know, nobody has run into that issue. I ran a 17 front with an EK SROZ chain and it never touched there. The sprocket cover was an obscenely tight fit and I decided to to a little clearance grinding on it, but never on the engine case itself.

NzBrakelathes · 02-20-2019, 02:40 AM

I was looking at sprockets and options today to make kits for sale
Maybe you can check the dimensions and as you see if my pics are correct there are a ton of combinations for the bike with a 428 chain that’s I ring and nice color options too

Let me know if I’m on the right size sprockets etc

Painlesstom · 02-20-2019, 07:19 AM

Well it would appear something has changed. lol The 17t front sprocket and stock chain combo just barely clears that area, so I would say that sprockets larger than that would not work. If using a o-ring or x-ring chain, I wouldn't go past 16t.

**JerryHawk250** · 02-20-2019, 07:27 AM

I'm running a 17 with an o-ring chain with no issues. There where a couple of members a while back that had the same issue you have. The problem they had was the groove cut for the sprocket retainer was cut closer to the engine. there solution was to put the retainer on first and bolted the retainer on from the back side. It was a pain in the rear put worked. But looking at you picture it looks like you won't have long enough shaft to do that. A 15/40 combo will put you at about the same gear ratio as the 17/40. I found the 16/40 worked good as an all around gear ratio. It is good for street and light off road trail riding.

**JerryHawk250** · 02-20-2019, 08:22 AM

I found the thread with the info and it also has a link to another thread with the same issue. http://www.chinariders.net/showthrea...procket+issues

NzBrakelathes · 02-20-2019, 10:04 AM

Quote:

Originally Posted by Painlesstom

Well it would appear something has changed. lol The 17t front sprocket and stock chain combo just barely clears that area, so I would say that sprockets larger than that would not work. If using a o-ring or x-ring chain, I wouldn't go past 16t.

Did you notice the vast possibilities on the rear sprocket?
I mean that’s nearly an endless gear set that could be used assuming I got the right sprocket
I did google and compared to another online but I’d be wanting a sizing from a stock rear sprocket to be sure tho

02-19-2019, 11:38 PM	#2
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,051	As far as I know, nobody has run into that issue. I ran a 17 front with an EK SROZ chain and it never touched there. The sprocket cover was an obscenely tight fit and I decided to to a little clearance grinding on it, but never on the engine case itself. __________________ 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
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02-20-2019, 07:27 AM	#5
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,585	I'm running a 17 with an o-ring chain with no issues. There where a couple of members a while back that had the same issue you have. The problem they had was the groove cut for the sprocket retainer was cut closer to the engine. there solution was to put the retainer on first and bolted the retainer on from the back side. It was a pain in the rear put worked. But looking at you picture it looks like you won't have long enough shaft to do that. A 15/40 combo will put you at about the same gear ratio as the 17/40. I found the 16/40 worked good as an all around gear ratio. It is good for street and light off road trail riding. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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02-20-2019, 08:22 AM	#6
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,585	I found the thread with the info and it also has a link to another thread with the same issue. http://www.chinariders.net/showthrea...procket+issues __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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02-20-2019, 07:19 AM	#4
Painlesstom Join Date: Feb 2019 Location: Ludowici, GA. Posts: 19	Well it would appear something has changed. lol The 17t front sprocket and stock chain combo just barely clears that area, so I would say that sprockets larger than that would not work. If using a o-ring or x-ring chain, I wouldn't go past 16t.
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