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Thoughts on the difference in a 132 and a 132.5 main jet for my CRF230?
Had it almost perfect with a 120 main and the stock pipe after I opened the airbox and removed the baffle. Now I need to move up again after installing a Pro Circuit exhaust. Looks like alot of people with 230's and aftermarket exhaust systems are using 132 mains but I was unable to find one and ordered a 132.5.

I never knew they made main jets in decemil sizes?
But either way .5 difference should not be any issue at all.
Are you sure it's 132.5? Just seems odd they would make those.....

yep, says right on it 132.5
Gonna have to keep experimenting though, took most of the bog away from 3/4 to full but still have some right before full throttle.

Socrates wrote:yep, says right on it 132.5
Gonna have to keep experimenting though, took most of the bog away from 3/4 to full but still have some right before full throttle.

Is it bog ? Or are you hitting the limiter???

Pretty sure its a bog, noticable decrease in power and sound. I think it is related to the jet. The 120 I had in there before I put on the T4 exhaust was a hex head and sat much lower that the current 132.5
The 132.5 is much much shorter in length than the 120 I took out.

Socrates wrote:Pretty sure its a bog, noticable decrease in power and sound. I think it is related to the jet. The 120 I had in there before I put on the T4 exhaust was a hex head and sat much lower that the current 132.5
The 132.5 is much much shorter in length than the 120 I took out.

You've got the wrong main in there... They should be the same length.

Should be this part #132 Main Jet 99113-GHB-1320

Should look like this except a 132 on it.

If it looks like this its for a Mikuni Carb not a Keihin Carb. They use half sizes.

Thanks ~,

Yep, Dealer ordered me the wrong one for my carb, even though I told him twice which one it was. I am ordering the correct one from Bikebandit today, see if that fixes my problem.

Well.. Changed out the main to the correct 132, now the bog is almost gone but it's still there. Seems like there is a large power loss as well at the top end of each gear. Revs up and then slight decrease in sound/power - then it just stays there.

I had no problems with the stock pipe, this only surfaced after the Pro Circuit was installed. I know the aftermarket pipes are much less restricitive but this is driving me crazy. Do you think I need to look at clip positions maybe changing those? I am running the power up needle.

Seems like there is a large power loss as well at the top end of each gear. Revs up and then slight decrease in sound/power - then it just stays there

No, that's hitting the rev limiter bud, no doubt about it.
That pipe you've got is working !
Here's one thing you may want to try, Rick Seiman, the infamous "Super Hunky" has a 230 and did this : He put on a 14 or 15 (you can try both)CS sprocket with a stock rear and the bike then has a first and second gear that works great, instead of just being a granny gear. You still have plenty of bottom end, but each gear winds out a lot longer for more speed in each gearbefore you hit the rev limiter.
I was skeptical until we tried it, the 14 did the job for my buds 230 ,and we won't be changing it back, a huge difference.
If it sounds funny, just TRY it, CS sprockets are cheap, you'll be surprised.
Rick Sieman did an awesome Project CRF230f series, here's a link to part of it. Check it out, it's really well done :
http://dirtbike.off-road.com/dirtbike/a ... ?id=380752
Here's a quote from it, so you get the basic idea :

Inexperienced riders panic out and think they need a creepy-crawly low gear when they go slow. All this does is make the bike harder to ride. The power comes on in a big burst and the rider finds himself fighting the sudden lurches. To further the problem, as the bike suffers from uncontrollable bursts of power, the rider uses the clutch and usually forward motion becomes erratic at best, and often results in stopping, or stalling.

Doug