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520 chain on a 250
Posted: Thu Jul 19, 2012 6:32 pm
by geomoto
Someone told me that there is a easy way to convert a 250 motor from 428 to 520 chain. They said is a countershaft sprocket off a "Honda Motocross bike" that has the exact same spline and "may have to shorten it a little". Has anyone done this, know what he is talking about? Using on a flat track bike w/Duc motor so sprockets for the Q/C rear wheel are easy to get. The 428 chain has held up but looks kinda spindly for the hole shots we try to do. Most of my competition is running a heavier chain.
I see here on the Bevel Heaven shopping there is a "530" sprocket for the 250. What the heck is 530, I thought it went from 428 to 520 on motorcycles. Some bikes have 530?
Re: 520 chain on a 250
Posted: Fri Jul 20, 2012 2:30 am
by Steve Foster
George,
You might find these useful:
http://www.gizmology.net/sprockets.htm,
http://www.dimensionsinfo.com/motorcycle-chain-sizes/
My 750 GT has 530 chain/sprockets and to the best of my knowledge most, if not all, of the bevel twins did.
Steve.
Re: 520 chain on a 250
Posted: Sat Jul 21, 2012 4:47 pm
by Kickaha
geomoto wrote: Most of my competition is running a heavier chain.
Doesn't mean that they need it, a good quality 428 should be easily enough, I've seen them used on 40 -50 hp bikes and 70-80 hp 250 Superkarts
520 chain gets used on 180 hp bikes with no problems I would have thought it was overkill
Re: 520 chain on a 250
Posted: Mon Jul 23, 2012 10:08 pm
by BevHevSteve
the DID 428 Exclusive Racing NZ gold and black chain I have listed on my site will more than do right on your bike, there is no reason to go larger which will add weight and friction.. >:|!!!
Re: 520 chain on a 250
Posted: Thu Jul 26, 2012 3:48 pm
by geomoto
Thanks for the input guy's. Probaly stick with the 428 and replace it every couple years. Steve, this bike (flat track frame) carries a lot of chain. Can't remember the link count but never found it "boxed". Last one I got from A&A Racing they cut off a spool.
Re: 520 chain on a 250
Posted: Thu Jul 26, 2012 4:46 pm
by BevHevSteve
i can get a 140 pin for you for if you need more than 120 pin that I have in stock, it is +7 or 10 bucks or so over the 120, I would need to look it up exactly if need be - count PINS on your existing chain so you know what you need and give me a call so we can get what you need sorted. Takes 1-2 days to get your chain in, rear sprockets depending on type are from a week to 3 weeks [bare aluminum, titan hard annodize, polished]. Front sprockets I keep in stock. THANK YOU