 ? on changing front sprocket on speedmaster
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Joined: Jun 2009
Posts: 2
Complete Newb
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OP
Complete Newb
Joined: Jun 2009
Posts: 2 |
I want to put a bigger sprocket on the front to drop rpm's on the top end. Anyone found a good combo yet? How many teeth and will stock chain work?
'04 Speedmaster, Bub slash cuts w/baffels knocked out, 13.5 in. apes, low profile seat, rear lowering kit from boogieman. No front fender, and I bobbed the rear fender.
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Re: ? on changing front sprocket on speedmaster
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Joined: Aug 2007
Posts: 10,711 Likes: 4
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,711 Likes: 4 |
18 or 19 tooth, you can get from fasteddysports.com or newspeedmaster.com
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: ? on changing front sprocket on speedmaster
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Joined: Jul 2007
Posts: 234
Adjunct
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Adjunct
Joined: Jul 2007
Posts: 234 |
19t, stock chain works fine, 30min to 1hr mod. Really easy. No longer looking for sixth gear and still OK off the line.
Adventure before Dementia...
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Re: ? on changing front sprocket on speedmaster
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Joined: Apr 2007
Posts: 3,057 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,057 Likes: 8 |
What year is your Speedmaster. The early models had 16 tooth front sprocket. The later models went to an 18 tooth (I think).
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: ? on changing front sprocket on speedmaster
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Joined: Jan 2005
Posts: 2,240
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,240 |
I've had the 16t (stock sprocket), the 18t, and currently the 17t. Chain will work, no problem with any of them.
You adapt to what you have. I liked the 16t for the first 8-10k miles (I can't remember), then the 18t made it a whole new motorcycle, and then I put the TRIUMPH America chain and sprocket kit (with the 17t front sprocket)on, and I'm just as happy with it. I even think seriously about going back to the 16t next chain/sprocket change....I liked it when I had it, and the bike runs so good over 5k rpm I think it would be fun to be able to run the higher rev range on the highway more than I can now.
You can't go wrong.
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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Re: ? on changing front sprocket on speedmaster
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Joined: Jun 2009
Posts: 2
Complete Newb
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OP
Complete Newb
Joined: Jun 2009
Posts: 2 |
Mine is an'04 SM. As you know it turns about 4000 rpm at 60mph. How much will my rpms drop going from a 16 tooth to a 19 tooth?
'04 Speedmaster, Bub slash cuts w/baffels knocked out, 13.5 in. apes, low profile seat, rear lowering kit from boogieman. No front fender, and I bobbed the rear fender.
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Re: ? on changing front sprocket on speedmaster
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Joined: Aug 2007
Posts: 10,711 Likes: 4
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,711 Likes: 4 |
Quote:
Mine is an'04 SM. As you know it turns about 4000 rpm at 60mph. How much will my rpms drop going from a 16 tooth to a 19 tooth?
I have a 17 tooth on mine, and I am sitting at 4000 rpm's at 70 mph.
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: ? on changing front sprocket on speedmaster
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Joined: Jul 2007
Posts: 96
Member
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Member
Joined: Jul 2007
Posts: 96 |
Quote:
Mine is an'04 SM. As you know it turns about 4000 rpm at 60mph. How much will my rpms drop going from a 16 tooth to a 19 tooth?
4000 rpm x 16t = 64000 divided by 19t = 3368 rpm @ 60mph.
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Re: ? on changing front sprocket on speedmaster
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Joined: May 2008
Posts: 247
Adjunct
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Adjunct
Joined: May 2008
Posts: 247 |
You'll drop aprox. 200 rpm's per tooth in high gear I run a 19't and think it would pull an even higher gear with no problem. I'm up to 51 MPG!
Chip Sciarra "07" America, N.C.Switch Blade windshield, Moto Lights, Tri. Off Road pipes
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Re: ? on changing front sprocket on speedmaster
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
I have an 18T sprocket and do close to 75 at 4000 rpm.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: ? on changing front sprocket on speedmaster
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Quote:
I have an 18T sprocket and do close to 75 at 4000 rpm.
+1 
that's just peachy for cruising the slab...
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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