Hawk Sproket gearing for steeper hills - Page 2

Alpha Reign · 04-11-2019, 03:48 PM

Quote:

Originally Posted by Audihuff

does anybody run stock chain and rear 50t sprocket, and only upgrade front sprocket to a 17t?

That is very common. I did that for a while until I got enough money for a 40t rear and an O-ring chain.

Audihuff · 04-11-2019, 05:14 PM

Quote:

Originally Posted by Alpha Reign

That is very common. I did that for a while until I got enough money for a 40t rear and an O-ring chain.

Thanks Alpha! Did you need to grind/ mod the cover to the front sprocket? I plan on doing this swap in about 45 min afyer work.

Ariel Red Hunter · 04-11-2019, 06:00 PM

Quote:

Originally Posted by Audihuff

Thanks Alpha! Did you need to grind/ mod the cover to the front sprocket? I plan on doing this swap in about 45 min afyer work.

No. It JUST fits over the 17 tooth sprocket...ARH

elkhunter338 · 04-11-2019, 11:17 PM

It's not a Hawk, but I am running the tt-250. Dad has a 16T/69 combo 428 chain (got the 69 rear from PBI sprockets) It's a good hill climber, Dad said 40 mph @ 7,000. I rode the bike only up a few hills and a fairly steep hill I used 2nd, for going real slow in rocky terrain 1st is perfect.

I am running a 15T/50 (stock rear sprocket) 428. I think mine is geared too tall. At 5,000 rpms, 1st = 12 mph; 2nd = ?; 3rd = 24 mph; 4th = 30 mph; 5th=36 mph;; at 6,000 rpms 5th=43 mph.

I ordered a 13T front sprocket and it should be here Friday. I can post new numbers if you like.

IMO again the engineers messed up the manual transmission gearing. Needed a lower 1st gear and little more rpm split between the gears. only 6mph split between gears is not enough split, when the engine will turn 8,000rpm.

elkhunter338 · 04-11-2019, 11:22 PM

https://www.gearingcommander.com/?fb...YaaFztoiLooj7I

this has the tt250 not sure how the transmission gearing is between the hawk vs. tt250. This might help you decide. I have checked this calculator and it's very close to my rear world gearing on my tt-250

Megadan · 04-12-2019, 12:39 AM

Quote:

Originally Posted by elkhunter338

this has the tt250 not sure how the transmission gearing is between the hawk vs. tt250. This might help you decide.

They are essentially identical in terms of transmission ratios.

HighMountianHawk · 04-12-2019, 07:08 AM

Thank you very much for all your advice, I appreciate it, I will do those things suggested

Ariel Red Hunter · 04-12-2019, 10:00 AM

Quote:

Originally Posted by Audihuff

does anybody run stock chain and rear 50t sprocket, and only upgrade front sprocket to a 17t?

I reccomend cleaning the chain completely in a kerosene bath, and then re-lubing it. I've used warm Gulf canning wax mixed with colloidial graphite for 60 years, but use whatever you like. That will give your stock chain every opportunity to give you good service...ARH

timcosby · 04-12-2019, 03:08 PM

Quote:

Originally Posted by Audihuff

Thanks Alpha! Did you need to grind/ mod the cover to the front sprocket? I plan on doing this swap in about 45 min afyer work.

the cover has one and only one position that it will fit over the chain. you have to find that one spot and bingo it slides right on. a lot of folks give up and start grinding but its not necessary

elkhunter338 · 04-12-2019, 11:45 PM

the 13T fits on the engine shaft, but won't fit with the chain. The chain hits the engine.
Right now the smallest sprocket that will fit the tt-250 is 15T. Maybe that is why CSC only sells 15/16/17T front sprockets.

I might order a 14T to try, not sure. then I could go 14/56 combo. without buying a custom rear sprocket.

Sochin · 04-13-2019, 12:05 AM

I use 17 front and stock 50 still here in the Rocky Mountains for all of my riding. I ride some steep stuff and it works just fine.....I still do 60-65 top speed.

HighMountianHawk · 04-14-2019, 08:26 PM

Quote:

Originally Posted by Sochin

I use 17 front and stock 50 still here in the Rocky Mountains for all of my riding. I ride some steep stuff and it works just fine.....I still do 60-65 top speed.

That's good to know and good to hear. did you modify your carburetor? And if so what did you do? B

NzBrakelathes · 04-14-2019, 09:14 PM

Quote:

Originally Posted by HighMountianHawk

That's good to know and good to hear. did you modify your carburetor? And if so what did you do? B

https://www.ebay.com/itm/303077495104

Hope this helps - will solve a few things with this kit

Sochin · 04-14-2019, 11:13 PM

Yeah NZ's kit will get you a GOOD start. You can use the stock carb as it comes, Nz's kit comes with all jet necessary. I bought a Mikuni VM26, jetting in my signature.

04-13-2019, 12:05 AM	#26
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	I use 17 front and stock 50 still here in the Rocky Mountains for all of my riding. I ride some steep stuff and it works just fine.....I still do 60-65 top speed. __________________ 1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT
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04-14-2019, 11:13 PM	#29
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	Yeah NZ's kit will get you a GOOD start. You can use the stock carb as it comes, Nz's kit comes with all jet necessary. I bought a Mikuni VM26, jetting in my signature. __________________ 1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT
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04-11-2019, 11:17 PM	#19
elkhunter338 Join Date: Dec 2018 Location: Oregon Posts: 81	It's not a Hawk, but I am running the tt-250. Dad has a 16T/69 combo 428 chain (got the 69 rear from PBI sprockets) It's a good hill climber, Dad said 40 mph @ 7,000. I rode the bike only up a few hills and a fairly steep hill I used 2nd, for going real slow in rocky terrain 1st is perfect. I am running a 15T/50 (stock rear sprocket) 428. I think mine is geared too tall. At 5,000 rpms, 1st = 12 mph; 2nd = ?; 3rd = 24 mph; 4th = 30 mph; 5th=36 mph;; at 6,000 rpms 5th=43 mph. I ordered a 13T front sprocket and it should be here Friday. I can post new numbers if you like. IMO again the engineers messed up the manual transmission gearing. Needed a lower 1st gear and little more rpm split between the gears. only 6mph split between gears is not enough split, when the engine will turn 8,000rpm.
	0

04-11-2019, 11:22 PM	#20
elkhunter338 Join Date: Dec 2018 Location: Oregon Posts: 81	https://www.gearingcommander.com/?fb...YaaFztoiLooj7I this has the tt250 not sure how the transmission gearing is between the hawk vs. tt250. This might help you decide. I have checked this calculator and it's very close to my rear world gearing on my tt-250
	0

04-12-2019, 07:08 AM	#22
HighMountianHawk Join Date: Oct 2018 Posts: 59	Thank you very much for all your advice, I appreciate it, I will do those things suggested
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04-12-2019, 11:45 PM	#25
elkhunter338 Join Date: Dec 2018 Location: Oregon Posts: 81	the 13T fits on the engine shaft, but won't fit with the chain. The chain hits the engine. Right now the smallest sprocket that will fit the tt-250 is 15T. Maybe that is why CSC only sells 15/16/17T front sprockets. I might order a 14T to try, not sure. then I could go 14/56 combo. without buying a custom rear sprocket.
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