RB-Designs carb mod or PowerNow?
 

Bike: 2005 DE 250 (12 oz FWW), LTR carb kit and LTR PV extender, FMF pipe and silencer

This summer I'm going to do a top end R&R and send the head to RB-Designs for a squish mod. I'm also considering sending in the carb (even though I have PowerNow on both sides).

I asked Ron that given my PowerNow, would it be worthwhile to ditch them and go with his mods. He kinda blanched at me ditching $100 worth of P-Now (even though the former owner bought it). I feel that the PNow in front makes the throat smaller and the PNow in back is kind of a slop-fest.

Any thoughts on the RB stuff squish and carb ?

Thanks,

Rick

I had RB do the squish on my 04 DE300 and it made the jetting better for
different temps. and more low end also. Before the head mod my bike would
run terrible when it was hot and humid.

Here is the info on the RBD carb mod for the 250/300 Gas Gas...

http://www.rb-designs.com/

I just rec'd my RB modded carb back from Ron, but I have yet to get my bike back together so I can't say if it is any better. What I can say is that Ron is a class act and he was upfront with me. I felt the carb was not right during last race season, and when he tore into it he found the choke was shot and several other gaskets and seals were shot as well. He contacted me and broke down my options and I chose to replace the parts. I just had to send him the additional cash. He also has fully modded carbs available for purchase if you don't want to change your stocker. His turnaround was quick too. I'll report back when I get it up and running and let you guys know what I think. It's just been too cold to work on bikes.

RB designs work is superb.

The head mod is at the top of my list for engine mods. It is the best bang for the buck. It significantly increases low and mid power while improving fuel economy.

The RB designs carb mod is a nice package. It is great for those that just want to install and ride.

The power now in the air filter side of the carb does not do much. Take it out and see how much difference it makes.

If your current jetting is well dialed in with the power now, I would not expect a significant improvment with the RB designs carb mod. If your current jetting does not work well then the RB designs kit will help.

I thought the carb mod added top end? MY new 07 revs like neither the 99 or 02 would, I attribute it to the RB bored carb, It also jets almost flawlessly from sea level to about 3000 feet.

Paul, I'm sure the carb has a lot to do with it, but my '07 250 also revs out higher than either my '00 or '03. I know the pipe and CDI map are different, and I'd bet the porting has been tweaked over the years as well.

That new FMF pipe is very nice. My bike has a SPES pipe on it now. Looks cool with its bare metal and all but does not seem to want to rev like the FMF did. Seem like it hits earlier and sign off earlier as well. When I switch back I will have to try and ride the bike right away to make a better comparison.

I'd like to do the RB designs squish and carb' mod's but there's no one here in the UK doing it and the shipping makes it to expencive.

Any idears?

Thats funny because on my 2002 EC250 I found the FMF did not do well past the huge mid range hit where as the Messico was softer on bottom and mid but had alot more top end.