Fasted 250 Big Red needs tall gearing.

**Jmoozy27** · 02-04-2015, 11:59 AM

That would make for a cool thread. I would definitely like to see that. Is it expected to have any overheating issue? Possibly an oil cooler installation?

**jeswinehart** · 02-04-2015, 01:02 PM

Why don't you just eliminate the rev limiter Mickey ?

**Mickey Dunlap** · 02-04-2015, 01:35 PM

Originally Posted by Jmoozy27

That would make for a cool thread. I would definitely like to see that. Is it expected to have any overheating issue? Possibly an oil cooler installation?

I built these back in the 90's when we GNCC raced them in the TRX 300's with no problems but I can't remember if I put my cooler on them or not.

**Mickey Dunlap** · 02-04-2015, 01:38 PM

Originally Posted by jeswinehart

Why don't you just eliminate the rev limiter Mickey ?

I hate electrics and I don't know how. I had a guy doing it in my 250x, 300ex and moved the retard up in the 350x, but he didn't claim the money I paid him and the IRS knocked on his door and he got mad at me for him not paying his taxes.

**Flyingw** · 02-04-2015, 04:17 PM

The Rev limiter is programmed in top the EPROM chips that are in the CDI. If somebody had the programmer it would be easy.

**jeswinehart** · 02-04-2015, 06:41 PM

Oh. So I am sure the wire terminal ends differ somehow but couldn't a 85es or 85sx be used instead of the 86/87 cdi ?
Neither of those had a rev limiter or at least my 85es and the 85sx I Used To Own Did Not Have it,,,,

**Mickey Dunlap** · 02-04-2015, 07:13 PM

Most stock motors won't hit the limiter unless you are going down hill. I just remember the Powroll SX wouldn't rev high enough to use the bigger cam. You banged through the gears so quick it wasn't even fun to ride. And the front end wouldn't stay down. That's why I wanted the Big Red being longer.

**Flyingw** · 02-04-2015, 08:10 PM

The CDIs do have rev limiters programmed in to them. Both ES and SX do and as Mickey pointed out, its designed to prevent engine over-speeding with no load on the motor. The 85 ES and SX CDIs had a single round plug. In 86, Honda took the engine kill wires out of that plug and moved them in to a second plug so the 86/87 have a two plug configuration. Honda did that to other models that year the same way.

**jeswinehart** · 02-04-2015, 11:17 PM

I am still sticking with no rev limiter on the earlier model es/sx.
There are some postings pertains to this on here somewhere.
If I recall correctly it was only after sx cranks started breaking limiters was added.
KB has some great info on cheap after market cdi's that are universal fits. I will find that tomorrow and copy\paste.

**Flyingw** · 02-05-2015, 04:14 AM

Ya I'd like to read that.

**petesatc** · 02-05-2015, 05:15 AM

I know how to remove the rev limiter from the CDI if that is the problem???

**jeswinehart** · 02-05-2015, 07:40 AM

Reference to a universal cdi
http://www.3wheelerworld.com/showthr...%2C+mythbusted

Post 5 shows some of the service bulletin.
http://www.3wheelerworld.com/showthr...miter+on+honda

Not that any of this is probably pertaining to Mickeys needs,,,, Pete how is it done ?

**Mickey Dunlap** · 02-05-2015, 09:54 AM

I'm not worried about the crank breaking or anything like that, for one it won't have the big heave clutch hanging of the crank because it will get rid of the auto clutch, it will be a manual clutch. Gets rid of a few pounds off the crank.. This is a sleeper, they won't know what they just go beat by! lol

**TheRealFatShady** · 02-06-2015, 03:57 AM

I think you can change the primary gear and the clutch basket gear from a foreman 450. I remember someone had done it while most used 250x/300ex gear swaps to lower their gearing for mud.

**big specht** · 02-06-2015, 12:49 PM

No auto clutch? How what other cases fit on it

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