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428 chain hummmmmm

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I'm not going to go changing my chain and sprockets soon. but was wondering how many people are running a 428 on your 230? when my sons 150 needs them i will change it over to a 428. but don't know about the 230. my old TY250 has a 428 on it. I have had it for about 13 years. I have kept good O ring chains on it DID. and i have trail rode it off and on some. they have held up good.

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I'm no expert, I'm not sure what ppl run on 230's..

But if its 520 stock, Id' say a 428 would probably be fine.. Due to the fact 100+ hp sport bikes run 520 chains all the time.. So a 230 at less then 1/5 the power should be fine on a 428 I'm guessing

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I went with the 428 setup for a while and then went back to the 520. You are very limited when it comes to sprockets with the 428 chain and it has a lot of side to side play when compared to a 520 chain. That and it seemed to stretch rather quickly.

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A 428H chain (H = heavy duty) weighs less then a standard 520 chain, and is exactly the same strength rating. There are more teeth on a 428 sprocket. You measure sprockets with different pitch by the outside diameter, not the number of teeth. So with more teeth, you have more of the chain riding on the sprocket, the sprocket will last longer. So a properly maintained 428H set up will last longer then a 520 standard.

As for power to the ground because of less rotating mass, I didn’t notice a bit of difference. The only thing I did notice with the 428 conversion was better engine braking. If more HP is getting to the ground, it would only be noticeable on a dyno.

Sprocket Specialists has every available 428 size you could want to put on a CRF150F or CRF230F. It may take them a week or so to make one, but they will make one for you.

Back in the late 70’s I raced a RM125 for five years on the same 428H chain and sprockets. Back then the 125’s came with 428 chains. Sold the bike and I’m sure it still had a couple good years left in it. A 125 two stroke cranks out way more power then a 150/230 four stroke. So if I could make a 428H last that long on a higher HP bike, you should have no problem making it work on a four stroke play bike. I have a Sprocket Specialists 428 conversion on a 2003 CRF150F that I installed shortly after buying the bike. For four years the bike was raced in Flattrack, and for the past two years it’s been raced in MX. The 428 chain and sprockets that I installed in 2003 are still on it, and are just now starting to show some wear. Granted, I clean and lube the chain AFTER EVERY RACE. But if you take care of your equipment, it will take care of you.

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