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Author Topic: RM250A NEED MORE BOTTOM END  (Read 1724 times)

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Offline PRITCH39

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RM250A NEED MORE BOTTOM END
« on: October 18, 2010, 09:53:57 pm »
Hi all,

I have an RM250A, I was wondering if any one knows if there are other model/heavier fly wheels that will go on this to help with the lack of bottom end pull. The motor is fresh and jetted well. any suggestions appreciated.


Brian 
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Offline Lozza

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Re: RM250A NEED MORE BOTTOM END
« Reply #1 on: October 18, 2010, 10:05:24 pm »
more compression
better pipe
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TM BILL

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Re: RM250A NEED MORE BOTTOM END
« Reply #2 on: October 19, 2010, 05:44:18 am »
Put a B motor in it  :)
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Offline Ktm181

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Re: RM250A NEED MORE BOTTOM END
« Reply #3 on: October 19, 2010, 08:38:33 am »

Add 1 inch to header pipe (25-30mm), worked on mine.

Kt
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Offline pmc57

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Re: RM250A NEED MORE BOTTOM END
« Reply #4 on: October 19, 2010, 07:03:09 pm »
My 250A's got more pull than a 15 year old boy, if you're in the powerband that is. Under that I agree it's like floggin a dead horse.
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Offline PRITCH39

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Re: RM250A NEED MORE BOTTOM END
« Reply #5 on: October 19, 2010, 07:52:01 pm »
Hi all,

I agree it has a great power band but pulling out of a stop corner is painfull. I am not exactly a light weight at 120kg but it is unlikely i will be losing 40kg anytime soon ;D, so I am looking for a cheap fix if there is one. The bike gates hard and often will holeshot even with my weight.I have ordered a set of boyesen reeds maybe this will help, or maybe I should try a smaller front sprocket but didnt really want to change mid and top end. I think I may be asking to much.


thanks for the replies


Brian
« Last Edit: October 19, 2010, 08:09:36 pm by PRITCH39 »
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DR

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Re: RM250A NEED MORE BOTTOM END
« Reply #6 on: October 19, 2010, 08:41:12 pm »
Brian, just remember, if all else fails, an RM370 will slot straight in thereby eliminating all of the lack of grunt issues ;D
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Offline BAHNZY

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Re: RM250A NEED MORE BOTTOM END
« Reply #7 on: October 19, 2010, 08:53:19 pm »
Ive a RM250C with Circle F pipe & muffler & standard porting running .40 over.
I had a similar issue and dropped back to a PE carburettor and the thing hauls off the bottom and through the middle. Sure the top end has dropped off a little but not enough that concerns me. In fact the bike is beyond my needs for outright power and i'm close to 120 kg geared up.
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Rod (BAHNZY) Bahn
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