Posts
633
Joined
9/6/2007
Location
Nor-cal, CA
US
Edited Date/Time
3/13/2015 5:49pm
So I'm looking for more power everywhere, but mostly off the bottom to mid. Should I look for the the right person local or wait and do a 265/295. Vet nov
05 RM 250, it's actually running real good right now. But some tracks/ obsticals it just feels like it needs a little more sometimes.
Will some porting do the trick, or should I suck it up and save my $$$ for more seat time, tires, etc. Btw the suspension is revalved and good.
Oem top end
V-3 reeds
PC works pipe and 304 silencer
Oem clutch & WC perch
10oz ffw
JD jet kit (sea level)
165 main
42 pilot
Red taper needle / 3rd clip
Also>> using Sunoco 110 leaded
-- for consistantcy & crispness
927 @ 32-1 (zero smoke & spooge)
I know a vortex ignition would be probably a good option,but I can't locate one.
But would the right port job deliver
05 RM 250, it's actually running real good right now. But some tracks/ obsticals it just feels like it needs a little more sometimes.
Will some porting do the trick, or should I suck it up and save my $$$ for more seat time, tires, etc. Btw the suspension is revalved and good.
Oem top end
V-3 reeds
PC works pipe and 304 silencer
Oem clutch & WC perch
10oz ffw
JD jet kit (sea level)
165 main
42 pilot
Red taper needle / 3rd clip
Also>> using Sunoco 110 leaded
-- for consistantcy & crispness
927 @ 32-1 (zero smoke & spooge)
I know a vortex ignition would be probably a good option,but I can't locate one.
But would the right port job deliver
it really is a good stock engine, with pipe etc. if you port it, it might make more power but not necessarily better.
if you can find some ultimate 4.4 VP race fuel, that will make more power than anything!
I'm hopefully headed to e street next weekend for the Othg race.
I've got an 06 rm 250
Stock porting
FMF fatty and power core
V3
Stock flywheel
sunoco 110 with 927 32:1 as well. She runs crisp, I'd love to swap bike for a lap or two and see what the pipe and flywheel weight are all about.
The Shop
How many hours on the top end?
Optimize your deck height with the appropriate thickness base gasket, then measure the head.
Use those measurements to get your head modded for race gas.
Switch to Renegade SX2 gas, you will have to rejet.
After doing that if you're still looking for more try a Bill's or FMF pipe, get the cases matched and porting touched up.
Head mod, SX2 gas and jetted accordingly will give amazing results.
sst would be no good if he's wanting more bottom end power...
wish we could get race gas as cheap as it is in America!!! costs so much over here we just run on pump fuel
Also make sure to keep your top end fresh.
I ran the PC with the 304 shorty, but the bottom end wasn't there- the factory fatty with the stock silencer worked best with great top end. the 304 shorty would crack at the bracket too.
be careful messing with base gaskets, the engine cases aren't machined totally flat where the cylinder bolts up, and if you aren't careful you can get an air leak.
the single ring wiseco YZ250 GP piston works good.
on the 2005, you can also upgrade by using the carb manifold and reed spacer from a yz250, its shorter and makes the engine noticeably crisper- they did this upgrade on the 2006 models
I always ran jetting 162-165 main with 110 leaded.
and yes, you can run the U4.4 in a smoker, IMO it is the best way to make more power. oxygen and lead, good stuff.
I'm interested in specific in porting/ altering timing which is probably the direction I want to go..... Not interested in a pure built race motor. Just closer to my RMZ 450 out of some the corners/ shorts exits before jumps/ doubles etc!
At Ted, got your text. I'll take it to try it out. Maybe est or Oatfield
At anyone wanting to try it for some laps, come on over a run it.
Top end is less then 10 hrs (guesstimate). And I just added the ffw not to long ago. Smoothe the hit somewhat, but what I was looking for was to clean up the wheel spin and have the suspension settle down on some tracks especially later in the day. Worked!
Slip..... Any suggestions on who
Riding it back to back with the RMZ is almost a curse...(I know I've ridden you're '11 and it's sweet). Knowing that you're going to EStreet, I'd pull that 10oz flywheel weight and try it out on the sand without it.
I used to run a 7oz on my KX250 for offroad and that's all I wanted. Didn't want to smooth it out too much. But for moto? Never messed with a flywheel weight on a stock motor for moto.
- I say adding the ffw helps more w/ smoothing out the busyness of the suspension especially in acceleration bumps because it lessens the wheelspin which helps it hook up better and doesn't jar the "f out your back if you don't happen to sit up right away... IMO
I just threw a new set of chain and sprockets on .... Maybe I'll order a 52 to try at Hangtown & Oatfield
But back to porting... Any pros and cons for specifically the '05?
Paging Digger to the white courtesy phone.... Any input on specifics !!
Pit Row
Cylinder and head mod, 39.5 mm taper bored carb, matched cases and a Vforce.
I did a fair amount of testing (Bills, PC, FMF and DEP) and I feel the Bills pipe is hands down the best (rider preference of course)
You can see in the pic below how far off the cases were when he started grinding on them, something like 3mm if I remember correctly?
I will post a pic of the carb mods too, pretty trick carb setup.
I run a 185 main, JD red needle in the 4th clip and a 45 pilot at sea level. Its hungry.
Last time I checked you're not doing woods riding on the East Coast. I left my '06 gearing stock (49 on back). I've had many people ride it of all abilities with no issue. I wouldn't go anymore than a 50 out back on your '05. A 52 will no doubt get you that un-intended wheel spin you're not looking for in motocross. Supercross? Sure, run the 52. But outdoor loamy/hardpack (and in some cases sand) stay close to stock gearing....less is more my Team Suzuki brother!
Here
Post #6
A lot more changes from 03-08 then I thought !!
@ Ted so your 06 came w/ a 49
I guess Suzuki in 06 misplaced Jody's memo, because my 05 came w/ a 50
They were probably going for more of a mellow-trackable motor set up just like their new 05 RMZ .... Which I drank the koolaide on!
I have also heard about the Bill's pipe to be a great match for the RM's. I have a fatty and a stock pipe. I will have to try the stock again. I did a slide change on the carb and that cleaned up the power delivery.
Best $$$ spent for an extra spare fun/ race bike !!!
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