07 RMZ250 "new" motor?

[Matt Fisher]

Is the 07 RMZ250 engine based on the same dung pile as the prior years, or is it an all-new design? If it's all-new, has anyone verified that it's a quality piece (or if it's just a piece)?

 

[Chili]

I've been watching several forums and so far haven't seen any negative stuff on the new RMZ engine.

 

[Martin Cole]

Hi - The RMZ 250 does have a new engine and he frame is now aluminium, so it is lighter. We bought one last week, spent a couple of hours running it in, changed the oil and took it to a practice track yesterday.
It really flies and showed it is good as anything else out there. The real test will be when the season starts at the end of January. based on what we've found so far we are expecting to be very competitive. The engine pulls really well and gets out of the gate fast. Handling is vastly improved - so far we're pleased to have made the decision to get one.
MC

 

[DrDuDe]

Its pretty sweet, ive got no complaints about it. Looks good and goes like hell!

 

[Chili]

Its pretty sweet, ive got no complaints about it. Looks good and goes like hell!

Does that mean you've upgraded from the 06 you have listed in your profile to the 07?

 

[DrDuDe]

No, i actually bought a new YZ250F Yamaha! Story is i work for a Suzuki/Yamaha dealer and i had a Suzuki last year, this year i wanted to try a Yamaha so got the white/silver 250F and got black rims, Doug Henry Replica kit on it. I cannot wait to try this bike out! I have tried the new Suzuki though and i thought it was better than the 06.

 

[conn424]

I just ordered me a 07 RM-Z250 the other day, will be here friday, im PUMPED :D, i read ALOT of reviews on my choices

 

[stevena198301]

I like mine. It is an absolutely new design. Not many P/Ns match from the previous years. More compression also. Not a bad bike at all, but 1 thing I don't like is the top-end power drop-off, in the higher RPMs. I hear a FMF pipe can fix it though.

 

[conn424]

is the top end bad enough that it is like you HAVE to get it?

 

[stevena198301]

No. It is all rider preference, I think. I like a long smooth power delivery. It is fine, stock, until you reach those peak RPMs. I doubt I'll get an aftermarket, but I don't need it. I'm slow...

 

[conn424]

lol same.. with me im going from a xr80 to this cuz i can pretty much flat foot the 150/85 so i have to so ima b takin my time for a while

 

[BUTTER]

We had our 2007 RMZ 250 out to several events this year. Overall, the bike has a nice feel both in power and in handling. There was a bog thing when the engine got hot that was cured with the Boyeson Quickshot. In my opinion, a must have for these stock Suzuki FCR carbs running with hot engines. But, there is also a different problem. Stalling coming out of turns (a problem even before the Quickshot retrofit). I'm beginning to wonder about the air intake position on the side panals. It seems the openings may be too far forward. Slidding back on the seat, as when accelerating out of a corner turn before you have a chance to get up on the pegs, seems to cover the air intakes at the same time you are trying to throttle hard. I think this is causing the stall. Yes, there is a small opening on the bottom of the air box to allow moisture to escape, but not nearly enough for proper air flow. It happened to us three times yesterday at a race in PA (contingency...rats!) It is the only time the stalling occurs. We are testing this assumption today by purposely sitting in the back seat position and throttling. We may have to go to an aftermarket air port where you drill a seperate port hole in the side panals and fit in the circular port. Anyone else seeing this?

 

[Chili]

I have serious doubts that your problem is anything related to those vents cut in your numberplates.

 

[BUTTER]

I have serious doubts that your problem is anything related to those vents cut in your numberplates.

Chili... you are correct. We tested that idea and found that very little of those side vents are covered in any of the seating positions one would normally use while riding. We do still think it is an air-flow issue and are having a specialist check it out. It could well be that what it takes is some good ole' fashion clutch feathering around the turn to keep the engine revs up, like was necessary with our 2-stroke RM. We were hoping to get away from that with the 250 4-stroke.

 

[Martin Cole]

Inside infor from one of the UK-based Suzuki teams suggests the air box doesn't let enough air in. They remove the fine mesh that covers the inlet to improve air flow.
On fast tracks we've noticed it does top out early - like its run out of gears. Our next move was going to be higher gearing, but it could be improved breathing will allow a few more rpm.
MC.

 

[Chili]

They remove the fine mesh that covers the inlet to improve air flow.

If you're going to remove your backfire screen I'd recommend getting the special backfire filters http://www.pitposse.com/twairbafiand.html

 

[Martin Cole]

Sounds like a sensible move, I've seen an early CR450 catch fire when the rider tried to start it.
The gauze can stay where it is for the time being!