sprocket problems!

rav007 · 01-31-2017, 08:22 PM

Hey there, long time lurker first time poster! So it seems my hawk is a little, unique? maybe not and I've just not found the right thread. So I attempted to put on a 17-43 with an O ring chain and was met with utter failure. the 17 sprocket was causing the chain to grind on the INNER housing (engine side) so i dropped it down to a 16 and it was still grinding( pictures attached). I later realized the channel the locking plate goes into is on the inside instead of the outside? is this normal? took me a while to realize it, also having a big chain rubbing on tire issue, even with the 15-43, likely going to go back to 15-50 and see if i can use just the o-ring chain. anyone else seen this? see pictures, i reinstalled the 15 sprocket in the picture btw. thanks for your feedback!

also not sure if it makes any difference but this is the chain i got - 428HV - seems to be fine to me but I'm no chain expert! its 3mm thicker then the stock chain - measuring at 20.6 link end to link end, anyone know what the 428SO is measuring?

https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1

rav007 · 02-01-2017, 08:11 AM

So I slept on it and it struck me I can probably install the retainer first and slide the sprocket on, essentially reversing it and having the gear further out, not ideal but I'm thinking it will still hold on fine, thoughts?

Sport Rider · 02-01-2017, 09:09 AM

I went from a 15 to a 17 tooth using the stock chain. I had to grind off a tab on the inside of the cover for it to fit back properly. that may be part of your problem. kind of a dumb question, but the chain is the same size, right?

2LZ · 02-01-2017, 10:49 AM

Also, o-ring chains are substantially wider than a regular chain. I can't imagine there being issues with just swapping sprockets.

rav007 · 02-01-2017, 11:14 AM

Quote:

Originally Posted by Sport Rider

I went from a 15 to a 17 tooth using the stock chain. I had to grind off a tab on the inside of the cover for it to fit back properly. that may be part of your problem. kind of a dumb question, but the chain is the same size, right?

It's an oring chain so it is wider. Only problem I see is that the tab I would have to grind off is the engine side, not the cover as I've seen with others. Not exactly sure what's on the other side! As far as chain as I understand it's correct and it fits the sprockets just fine, but being oring it is wider.

rav007 · 02-01-2017, 11:14 AM

Quote:

Originally Posted by 2LZ

Also, o-ring chains are substantially wider than a regular chain. I can't imagine there being issues with just swapping sprockets.

Do you see the run mark on the left hand side on the engine cover? That's where it's hitting, not sure if grinding that are is a good idea?

timcosby · 02-01-2017, 10:48 PM

i had no problem with putting the 17 on mine. had to wiggle the cover a little to get it to go back on but it went. i kept the stock chain. shim or a fender washer behind the sprocket might move it out to clear the wider chain.

rav007 · 02-02-2017, 08:43 AM

I don't think you are seeing what I am referring to. Compare the sprocket location in this photo below to the one In my first post. Notice the one in my post the sprocket is to the inside and the one here is on the outside. I'm sure as new hawk owners purchase their 2016 bikes we will see more like this and a simple sprocket change isn't so simple anymore

mtiberio · 02-02-2017, 12:16 PM

clearly the output shaft is different in the two photos you posted. The first picture shows the sprocket mounted much deeper on the shaft (or the shaft is longer). Someone probably makes a dished sprocket.

wilserchinarider · 02-03-2017, 08:40 AM

The different output shafts is puzzling. I think this is more of a chain problem than a sprocket problem?

From what I have read, an o-ring chain isn't really needed on these bikes???

Bill1 · 02-15-2017, 02:09 PM

I just put new 17/45 sprockets on my hawk and a JT standard chain. My chain is rubbing slightly on the inside of the housing (engine side) like the original poster was talking about. My output shaft looks like the one in RAV007's first picture, with all of the shaft still showing.

Anyone have a solution?
I like the new gearing combo too much to switch back.

Ascot500 · 02-15-2017, 02:43 PM

Has anyone looked at the chain's alignment?
If the two sprockets are on different planes, then the output shaft was likely mis-machined and this becomes a warranty issue.
But if the alignment is good, then the output shaft was likely revised to work with the rear wheel combo.

Azhule · 02-15-2017, 02:52 PM

16t front 42t rear (2.63) should be a close enough ratio to the 17t front 45t rear (2.65) setup, the 16t should give you a little more clearance up front if that was your issue

**JerryHawk250** · 02-15-2017, 03:33 PM

You can also go with a 40 tooth on rear and keep the stock 15 on front. Close to the same gear ratio.

Bill1 · 02-15-2017, 10:52 PM

I rode the bike to work tonight, so I'll take the cover off again tomorrow and check to see how badly it scrubbed. There was some runout in the output shaft so hopefully it will not be as bad as I initially thought.

I will probably order a 16T sprocket anyway and maybe another rear in 42T.

01-31-2017, 08:22 PM	#1
rav007 Join Date: Jan 2017 Posts: 13	sprocket problems! Hey there, long time lurker first time poster! So it seems my hawk is a little, unique? maybe not and I've just not found the right thread. So I attempted to put on a 17-43 with an O ring chain and was met with utter failure. the 17 sprocket was causing the chain to grind on the INNER housing (engine side) so i dropped it down to a 16 and it was still grinding( pictures attached). I later realized the channel the locking plate goes into is on the inside instead of the outside? is this normal? took me a while to realize it, also having a big chain rubbing on tire issue, even with the 15-43, likely going to go back to 15-50 and see if i can use just the o-ring chain. anyone else seen this? see pictures, i reinstalled the 15 sprocket in the picture btw. thanks for your feedback! also not sure if it makes any difference but this is the chain i got - 428HV - seems to be fine to me but I'm no chain expert! its 3mm thicker then the stock chain - measuring at 20.6 link end to link end, anyone know what the 428SO is measuring? https://www.amazon.com/gp/product/B0...0?ie=UTF8&th=1 Last edited by rav007; 01-31-2017 at 09:14 PM.
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02-01-2017, 10:49 AM	#4
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,080	Also, o-ring chains are substantially wider than a regular chain. I can't imagine there being issues with just swapping sprockets. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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02-15-2017, 02:09 PM	#11
Bill1 Join Date: Sep 2016 Location: FL Posts: 95	I just put new 17/45 sprockets on my hawk and a JT standard chain. My chain is rubbing slightly on the inside of the housing (engine side) like the original poster was talking about. My output shaft looks like the one in RAV007's first picture, with all of the shaft still showing. Anyone have a solution? I like the new gearing combo too much to switch back. __________________ 2016 RPS Hawk 250, exhaust, Uni Filter, Mikuni VM-26 clone w/ 120 main & 30 pilot, MSR shifter, 17/45 sprockets, JT chain, digital cluster...
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02-15-2017, 02:52 PM	#13
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	16t front 42t rear (2.63) should be a close enough ratio to the 17t front 45t rear (2.65) setup, the 16t should give you a little more clearance up front if that was your issue __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
	1

02-15-2017, 03:33 PM	#14
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,554	You can also go with a 40 tooth on rear and keep the stock 15 on front. Close to the same gear ratio. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 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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02-01-2017, 08:11 AM	#2
rav007 Join Date: Jan 2017 Posts: 13	So I slept on it and it struck me I can probably install the retainer first and slide the sprocket on, essentially reversing it and having the gear further out, not ideal but I'm thinking it will still hold on fine, thoughts?
	0

02-01-2017, 09:09 AM	#3
Sport Rider Join Date: Jan 2016 Location: Mooresville NC Posts: 2,038	I went from a 15 to a 17 tooth using the stock chain. I had to grind off a tab on the inside of the cover for it to fit back properly. that may be part of your problem. kind of a dumb question, but the chain is the same size, right?
	0

02-01-2017, 10:48 PM	#7
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	i had no problem with putting the 17 on mine. had to wiggle the cover a little to get it to go back on but it went. i kept the stock chain. shim or a fender washer behind the sprocket might move it out to clear the wider chain.
	0

02-02-2017, 08:43 AM	#8
rav007 Join Date: Jan 2017 Posts: 13	I don't think you are seeing what I am referring to. Compare the sprocket location in this photo below to the one In my first post. Notice the one in my post the sprocket is to the inside and the one here is on the outside. I'm sure as new hawk owners purchase their 2016 bikes we will see more like this and a simple sprocket change isn't so simple anymore
	0

02-02-2017, 12:16 PM	#9
mtiberio Join Date: Jun 2016 Location: Arlington, VA Posts: 258	clearly the output shaft is different in the two photos you posted. The first picture shows the sprocket mounted much deeper on the shaft (or the shaft is longer). Someone probably makes a dished sprocket.
	0

02-03-2017, 08:40 AM	#10
wilserchinarider Join Date: Jun 2010 Posts: 380	The different output shafts is puzzling. I think this is more of a chain problem than a sprocket problem? From what I have read, an o-ring chain isn't really needed on these bikes???
	0

02-15-2017, 02:43 PM	#12
Ascot500 Join Date: Apr 2007 Posts: 90	Has anyone looked at the chain's alignment? If the two sprockets are on different planes, then the output shaft was likely mis-machined and this becomes a warranty issue. But if the alignment is good, then the output shaft was likely revised to work with the rear wheel combo.
	0

02-15-2017, 10:52 PM	#15
Bill1 Join Date: Sep 2016 Location: FL Posts: 95	I rode the bike to work tonight, so I'll take the cover off again tomorrow and check to see how badly it scrubbed. There was some runout in the output shaft so hopefully it will not be as bad as I initially thought. I will probably order a 16T sprocket anyway and maybe another rear in 42T. __________________ 2016 RPS Hawk 250, exhaust, Uni Filter, Mikuni VM-26 clone w/ 120 main & 30 pilot, MSR shifter, 17/45 sprockets, JT chain, digital cluster...
	0