chain and sprockets

[crf_150_04]

i'm just about to change my chain and sprockets and im not sure if i should do any changes or just go stock again?

[Crf230 Rider]

What kind of riding do you do?If your hill climing and you want more torque, add some teeth on the rear sprocket or drop a tooth on the front.You could always use some more low end on a 150.If you like the stock gearing, stay with it.

[04CRF150F#319]

Do you want quicker acceleration or higher top speed?

Cheers,

#319

[04CRF150F#319]

add some teeth on the rear sprocket or drop a tooth on the front.

I've read here on TT that a 12T is not recommended for the front.

Rule of thumb-1 tooth on the front=3.5 teeth on the rear.

Cheers,

#319

[Jeffsgirl]

Sidewinder 428 conversion!

[TrikeKid]

I've read here on TT that a 12T is not recommended for the front.

Rule of thumb-1 tooth on the front=3.5 teeth on the rear.

Cheers,

#319

Do you really think 12T's would sell if they ruined things?

[Crf230 Rider]

I'm sure a 12 tooth front sprocket won't acctaully wreck anything, but It would be harder on things.Just because something can wreck stuff doesn't mean it won't sell.Lots of people have the BBR rev box, don't tell me that does any good for your engine.

[xXHondaOwnsXx]

I'm sure a 12 tooth front sprocket won't acctaully wreck anything, but It would be harder on things.Just because something can wreck stuff doesn't mean it won't sell.Lots of people have the BBR rev box, don't tell me that does any good for your engine.

Yeah I agree. I think rev boxes are a waste of money. Your just paying to get that much closer to blowing your engine.

[i heart ridin]

definitly go with trimoly 428 conversion from sidewinder. U WILL LOVE IT! adds 3 hp and u lose alot of weight as well

[04CRF150F#319]

Do you really think 12T's would sell if they ruined things?

When did I say that?

I've read here on TT that a 12T is not recommended for the front.

Cheers,🤣

#319🤣

[ssjTiamat]

The only problem with the 12 tooth sprockets is this. The smaller you get on your countershaft sprocket the more stress you can put on your chain. So it is just something to watch for.

I have plenty of guys who ride with 12's on the crf's. It is all a matter of taste. But when you do run a small countershaft (on any machine) you just need to be aware that the smaller the front sprocket = the more stress on the chain.

And yes.. the TI-MOLY conversion is sweet. And like previous readers have stated.. it is all a matter of taste and riding styles.

[i heart ridin]

ya sorry TI-MOLY lol. the rev box if ridden correctly DOES NOT RUIN UR ENGINE! in fact after i got oone and rode with it for about a year i did a check up on the engine and everything was in tip top shape. now remember i said if ridden correctly. and it wil give u quite a bit more pep out of ur little crf as well.

[CRF150Joe]

you cant gain horsepower by your chain and sprocket horsepower is a measure of power out of the engine....i would get a 50 in the rear thats what im doing leave the front alone and buy a new better quality chain dont bother with the 428 conversion they stretch soo quickly and you have to buy a new sprocket front and rear instead of like 50$ it will cost you like 120$ but whatever its up to you

[bob333]

When did I say that?

Cheers,🤣

#319🤣

up the page a little

[bob333]

i'm just about to change my chain and sprockets and im not sure if i should do any changes or just go stock again?

go with the sidewinder 428 and go a tooth biggger in back

[lilGirl]

I have a 12t on the front because it's way easier to switch it back to the stock 13t when I want to.

If it's a bit harder on the chain/sprocket I can live with that as I'm not riding the bike to death anyway (wish I was though!). I figure, for the cost I've already put into things, if I have to go buy a new sprocket/chain a little sooner I'm not going to worry overly about it.

p.s.- the 12t did make quite a bit of difference.

[ramz]

The only problem with the 12 tooth sprockets is this. The smaller you get on your countershaft sprocket the more stress you can put on your chain. So it is just something to watch for.

I wouldn't say more stress on the chain, but certainly more wear on the chain and sprocket. A chain is uniquely designed to flex around the sprockets, and a smaller sprocket will cause the chain to flex further, but this wouldn't be outside the operating limits. Extra stress from a few degrees more of flex is probably measurable and certainly calculable, but I would guess that it's very small. Think of a chain flexing at a link joint; does it seem like there's more stress if it flexes more? There's little or no resistance to the flex action itself.

As for increased wear, this is caused by the smaller sprocket having more chain-link to sprocket-tooth meshes. If metal rubs metal more often, there's more wear.

I installed a 12t front sprocket (Sprocket Specialists 568) on my CRF230F when I first got it in Nov, 2002. Now, after 8,100 miles, the chain is wore out. Altogether, including the sprockets I'm replacing now, I used three front sprockets and one rear sprocket.

Both the front and rear sprockets are steel, so they should wear at the same rate. The drive ratio between the rear and front is 50:12, about 4 to 1, so the rear should last 4 times longer. That's pretty close to what my wear rate was: 3 to 1.

All in all, I'm quite happy with how long the chain lasted and how well the front sprocket held up (and the rear). I hope the next set performs just as good.

[MXridin841]

for mx riding...what would be the recommended gearing. i dont ride trails, just at the track and i have been interested in the 428 conversion for awhile. thanks.

[honda dog]

ya man side winder is the way to go, 2 hp increese 3 pounds lighter and only about 120 bucks more

[Deverix]

ya man side winder is the way to go, 2 hp increese 3 pounds lighter and only about 120 bucks more

For the record, changing the gearing, including converting the chain/sprocket type or size, has absolutely no effect on "horsepower". You may gain an advantage from reducing unsprung weight via gearing/sprocket/chain changes, but you can only affect horsepower via changes to the engine or related components (jetting, exhaust).

I replaced the stock 48T 520 rear sprocket with a 50T Renthal aluminum sprocket, and swapped out the heavy stock chain for a lighter Renthal Works gold chain. The Renthal sprocket is significantly lighter than stock, the 2T increase gave me more spirited acceleration without noticable loss in top speed, and the whole setup is ABSOLUTELY BEAUTIFUL Made those changes for $100 via Rocky Mountain ATV.