[slo mo]

thanks

 

[slo mo]

I just installed the JTF1908.15RB sprocket from SO CAL Powersports $18.98 to the door. It fits perfectly, I still do not think a 16 tooth will fit under that wiring guard, but heck who knows somebody will figure out something if they can find a 16 tooth sprocket that is. Pouring rain test drive coming soon. View attachment 49
View attachment 48

What size socket is needed to remove sprocket? Is it left or right hand thread? I appreciate any and all installation information.

 

[Bent Sprocket]

What size socket is needed to remove sprocket? Is it left or right hand thread? I appreciate any and all installation information.

Sorry I cannot remember the size, it was in the 20+mm range right handed threads.

 

[slo mo]

Thank you for the reply My sprocket should arrive Wednesday. I will try to arrive at the original torque spect. and post

 

[RAT400x]

Anyone find sprockets for this fine machine yet? If so, what are the part numbers?

Here's a link to a 15 tooth front sprocket. I have not tried it yet, but another forum (Triumph Rat) said it fits fine.

Amazon.com

 

[slo mo]

Anybody know what the torque spec is on this sprocket? It’s not in the owners manual.

did you need a puller to remove the sprocket? Did you have to split the chain? Could not get the original torque value had to use the rattle gun to remove the nut

 

[Bent Sprocket]

did you need a puller to remove the sprocket? Did you have to split the chain? Could not get the original torque value had to use the rattle gun to remove the nut

I just pulled sprocket off with little pry bar with angle at the tip. It wiggled off after working it back and forth. I lifted the chain off the sprocket, loosen rear wheel push it all the way forward. Leaves plenty of slack to remove off sprocket.

 

[Moto Nonno]

Has anyone tried fitting a 41 tooth rear sprocket on a Speed 400 or Scrambler? That may be the only option for higher gearing on the Speed 400 as the Speed 400 already has the larger 15 tooth counter sprocket that some have upgraded their Scrambler to. It's easy to take the scrambler to a 15 tooth from a 14 tooth stock counter sprocket as the 15 tooth is available and we know it will fit. A 16 tooth looks like it may not fit at all with the internal guard that exists on both bikes. Has anyone tried to fit a 16 tooth counter sprocket?

Ref notes for some head scratchin' and Old Speckled Hen swiggin':

Scrambler stock gearing- 43 tooth rear sprocket, 14 tooth counter sprocket, 140/80 17" tire. (25.82" diameter)

Speed 400 stock gearing- 43 tooth rear sprocket, 15 tooth counter sprocket, 150/60 17" tire. ((24.09" diameter)

Moto Nonno

 

[Silshooter]

Has anyone found a 41 tooth rear sprocket part number or supplier?

 

[Moto Nonno]

Has anyone found a 41 tooth rear sprocket part number or supplier?

Here's the only one I can find that says it's for the Triumph Speed 400. Bad news it's in Australia. But may help with info to find one in USA. I suspect there is one that will work once we figure the mounting dimensions will work/match.

41t Steel Rear Sprocket for 2024 Triumph Speed 400 (rpmmoto.com.au)

Do these dimensions match? More research required. The fun continues.

Moto Nonno

 

[slo mo]

Thanks. I split the chain and used a puller to remove the sprocket. All in all pretty straight forward. Took an hour and a half. I just happened to have a chain breaker and the right master link. Had to buy a 27mm socket. I torqued to 90 ft lbs should be sufficient. As it is 90-95 degrees here. Test ride early tomorrow evening. With the throttle fix and sprocket change should be just about perfect. thanks to all for advice.

 

[LIRider]

Is it necessary to split the chain in order to change the sprocket?
Loosening the rear wheel and chain adjusters isn't enough?

 

[slo mo]

Here's a link to a 15 tooth front sprocket. I have not tried it yet, but another forum (Triumph Rat) said it fits fine.

Amazon.com

With the throttle fix and the 15 tooth sprocket bike is now so much better, I am now happy.

 

[NT_]

Chain splitting is not necessary. You can loosen the rear wheel and turn the chain adjusters in about an inch and it gives enough slack to slip the chain off the rear sprocket. Once this is done, the front comes out easily.

 

[Vector]

Thanks. I split the chain and used a puller to remove the sprocket. All in all pretty straight forward. Took an hour and a half. I just happened to have a chain breaker and the right master link. Had to buy a 27mm socket. I torqued to 90 ft lbs should be sufficient. As it is 90-95 degrees here. Test ride early tomorrow evening. With the throttle fix and sprocket change should be just about perfect. thanks to all for advice.

Can you please list the new RPM’s at various speeds?
Thx

 

[LIRider]

Chain splitting is not necessary. You can loosen the rear wheel and turn the chain adjusters in about an inch and it gives enough slack to slip the chain off the rear sprocket. Once this is done, the front comes out easily.

Thanks for the reply. That's just what I wanted to hear

 

[slo mo]

Can you please list the new RPM’s at various speeds?
Thx

As I wear distance glasses when riding the little RPM indicator is hard to determine. I can only tell you 70mph is a little below 6,000 RPM, 1st gear is much more manageable, 2nd gear is good for rolling start, 3 4 and 5 for everything else 6 for freeway. IMO well worth it.

 

[slo mo]

I would focus on the rear sprocket, drop a couple of teeth you’ll be right where you want to be more than likely. When I see one around 40 tooth I’ll try it.

When I had my sprocket off, the back plate has 3 screws, the holes could be elongated a little to gain clearance. Not much, but just maybe.

 

[Toxigig]

Here's the only one I can find that says it's for the Triumph Speed 400. Bad news it's in Australia. But may help with info to find one in USA. I suspect there is one that will work once we figure the mounting dimensions will work/match.

41t Steel Rear Sprocket for 2024 Triumph Speed 400 (rpmmoto.com.au)

View attachment 167
Do these dimensions match? More research required. The fun continues.

Moto Nonno

I made some measurements and came up with 66 mm ID, 110 mm BC, & M8 clearance.

I went ahead and ordered a 37 tooth rear for my Scrambler 400 from Rebel Gears. It should arrive in the next few days. Looking forward to the change. Hopefully not too much chain contact with the slider on the top of the swing arm.

 

[Toxigig]

I guess the other part is. I don't think that drawing is correct for the Triumph.