mods for 01 250f

J

jreghs50

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Jan 2, 2003

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• Jun 28, 2003

• #1

i just bought an 01 250f that had 2hours on itand i was wondering what the best cheapest mods are for the bike thanks.

 

Senior KX Rider

Super Power AssClown

Nov 9, 1999

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• Jun 28, 2003

• #2

post in one forum only

 

Rich Rohrich

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• Jun 28, 2003

• #3

1) Learn how to adjust the suspension for the conditions
2) Learn how to adjust the jetting for the fuel you are running and the weather/riding conditions
3) Learn how to adjust the valves and change the piston and rings
4) Run a fuel that will vaporize at high engine speeds like the oxygenated fuels from Phillips, VP and Nutec
5) Keep fresh tires on it

 

Last edited: Jun 28, 2003

JWW

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• Jun 28, 2003

• #4

Rich... Are you able to be a little more specific on the fuel? Im kind of a heavy guy for my 250F. If mixing a little higher octane fuel with my pump 91 would help I would be all over it.

Thanks

 

Rich Rohrich

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• Jun 28, 2003

• #5

Good choices (in no particular order) would be :

Phillips B35 now called Track Tech 101 (good price/performance balance)
VP Ultimate 4, MRX, or MR1
off the top of my head I don't remember the Nutec 4 stroke fuel name (I don't use it)

 

Last edited: Jun 28, 2003

JWW

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• #6

Another quick one for you. After posting earlier I did a net search for Nutec. I found a article at TWMX that sounds impressive. On to my question.... When using these fuels do you need to rejet or make any other adjustments.

I know there have been many threads on high octane fuels. They all end up in technical debates. Im just looking for a down and dirty answer.

 

Rich Rohrich

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• Jun 28, 2003

• #7

Originally posted by RMjeff
When using these fuels do you need to rejet or make any other adjustments.

Click to expand...

Im just looking for a down and dirty answer.

Click to expand...

YES

 

Last edited: Jun 28, 2003

bclapham

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• Jun 28, 2003

• #8

Jeff: i would look around for the VP fuel, ultimate 4 its quite popular around here. the Nutec stuff isnt cheap and its much harder to find.

to add to Rich's answer, the new wave of 4-stroke fuels have what is known as oxygenates- these will make the bike run leaner and so generally, you will have to run richer jets to compensate.

 

JWW

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• Jun 28, 2003

• #9

Thanks guys :thumb:

 

P

Pvt Joker

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• Jun 29, 2003

• #10

This is really great information and couldn't be any more timely for me.

I just picked up a used '02 YZ250F from a Kayaba suspension tuner. He'd been running VP4 (I think) and the thing ran like a rocket. The three times I've ridden it, I've just been adding 91 pump gas to the tank.

Because I only ride 2 or 3 times a month, I don't have a big problem paying a little more for 5 gallons or so per month... Will it really help using the VP ultimate 4? And if so, it ran so well before, I just need to keep an eye on my jetting?

 

bclapham

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• Jun 29, 2003

• #11

Mike: if it was setup for then U4 it might run a bit rich on the pump stuff- maybe ask the guy what he did with the jetting.

if you are going to run the expensive race gas, try and keep it in the drum and buy a smaller 2 gallon plastic fuel jug to transport just enought gas to the ride- its also well worth draining the fuel out after the ride for storage in that smaller container.

 

P

Pvt Joker

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• Jun 30, 2003

• #12

Thanks :thumb: