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Makotosun

Sprockets and chains

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Sprockets and chains was created by Rosko

Where can I find the best place to replace my sprockets and chain with a 4.00 for bottom end speed (12/48, 13/52, 14/56, 15/60, 16,64 combinations)
Thanks
11 May 2024 16:37 #1

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Replied by Ht1kid on topic Sprockets and chains

Greetings from Tennessee 

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 We need some more info Make,model,and year etc.
11 May 2024 20:06 #2

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Replied by RT325 on topic Sprockets and chains

Greeting from NZ. So any combo divided by four.
Look forward to hearing more about your bike, model etc.
I'll guess DT1 "because i like DT1's & have one"--a very rough one.
Look forward to your return. Cheers.
ps, this link looks useful & might be good no mater what your bike is.
www.denniskirk.com/sprocket-and-pulley/1...a-dt1-enduro-250.mmy
Last edit: 11 May 2024 22:43 by RT325.
11 May 2024 22:37 #3

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Replied by Rosko on topic Sprockets and chains

Its a 1969 250 dt1b, I have a 15/45 on it at the moment but its to fast for the woods can get the front but harder to find the rear.
12 May 2024 05:19 #4

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Replied by MarkT on topic Sprockets and chains

PBI (located in Oregon), Sprocket Specialists (Utah), and Rebel Gears (Tennessee), are three companies that come to mind that have or will make you almost any sprocket you want.  You may need to call them as gearing changes for 50+ year old bikes might not exist in their current catalog.  I've used all three companies.  Sprocket Specialists seemed to be the most knowledgeable.  All are high quality. 

Yamaha tended to use the same spline and bolt pattern for multiple years/models though this is not always well documented and catalogs for older models are sparse.  JT sprockets catalog has a lot of engineering diagrams that show bolt circles and pilot holes and you might find what you need there.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post: DVM, yamahahaha, Rosko, Bikes4Dan
Last edit: 12 May 2024 06:27 by MarkT.
12 May 2024 06:26 #5

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Replied by RT325 on topic Sprockets and chains

Why change both, just go down on the front to a 13 or 12.
Here's a 12
www.denniskirk.com/jt-sprockets/self-cle...12n2.prd/8099312.sku
12 May 2024 17:06 #6

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