CaveMike put cylinder in mail today. Cylinder go away as 250, but coming back as 295, long smooth powerband. CaveMike drop off bottom end for be bead blasted, look pretty. Him going rebuild with new bottom end, complete wr 1-5. CaveMike order 39.5mm carb kit from carb parts warehouse. Wr295 coming. Be afraid.

CaveMike, on 08 June 2012 - 08:50 PM, said:

Soon CaveMike throw many big rocks long way

Good for CaveMike.  CaveMike be manly man with big, bad, angry YZ!

I wonder if Eric charged Caveman in Angora goats, or beaver pelts?   I cannot wait for  a review.

CaveMike forced pay with shiny rocks, just like everyone else.

Caveman Mike like 295....him go faster than saber tooth tiger with wr gear. Him need give feedback on bigger carb.

I got mine together last week and got to take on a little 45 minute ride in some single track near my house, very smooth powerband, tons of low end, and still has overrev.

I too am thinking about a carb upgrade due to the increased bore...any recommendations out there, I know there is a company called "RB"? I think, and they put in a divider and taper bore the carb.  
I need to look into what you mentioned and see what the deal is with that one..

Do you have a link to the carb?? My search is not turning up what I want..

Edited by DIESEL Power ATK, 09 June 2012 - 08:44 AM.

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

i'm building mine just like that at the moment too, hope to be done in a couple weeks, can't wait.......................

CaveMike order completely new carb from carb parts warehouse. Instead of try freshen up 8 year old carb, him get new one for 229. Old one work okay, but CaveMike feel brand new motor deserving of brand new carb. CaveMike still considering rb mods, just not need get carb bored.

mtdirtbag, on 09 June 2012 - 01:13 PM, said:

Thanks, thats the one, I also looked on carb warehouse.com like mentioned in the 1st post but not sure what I am looking for, a 39.5 mm "kit"? I imagine this is an entirely new carb since machining would need to take place in order to enlarge, not to mention tapering it...

I would imagine sending it to RB would be a more cost effective way to go if you have the time.

Just checking options since I want my new setup to work properly and I do feel that it would really benefit the top end power since the carb was only meant to keep up with the demands of a 250, now with an extra few cc's, it just needs a little more and it should work out great.  I only have about 1 hour on my EG  ported big bore head so far and it feels really good and has a ton of low end power (I also added an 11oz flyweight), I havent been able to use the WR gears (only 3-5 since I have a recluse clutch) since all I got to ride was tight slick single track...better than nothing!

Any more info on the carb warehouse.com 39.5 mm upgrade would be great.

Your going to love your new bike, will be a completely different animal!  I know I do.

CaveMike, on 09 June 2012 - 03:52 PM, said:

Haha, you posted as I was writing..

So the new one is a 39.5 mm? So then you would just have RB do all the other stuff besides the bore if I understand correctly.

Gonna have some sweet man-jewelry, shiny carb....I love when stuff looks new, just makes you happy inside.

had rb do my carb and its nice work.
just want to feel the power now !

CaveMike find out about 39.5mm carb from Eric Gorr. Carb parts warehouse have them back ordered for 7-10 days now. Eric Gorr say carb add 3 hp on top, help extend powerband. CaveMike want talk to other people about what "low speed circuit modifications" be, and how good divider plate be.

So if you have time you can have your own carb bored out to 39.5 by RB?  Other than being new a bored carb should do the same thing right?  I have mine ported mid-top so I'm thinking the extra air at the top would be even ore beneficial.

i have be thinking about the rb designs mods. how do the mods affect jetting? oh and good luck with the build cave mike!! your gonna love it.

CaveMike, on 09 June 2012 - 07:57 PM, said:

As I understand it, the divider plate really helps simplify jetting by separating -- so to speak -- the circuits. The divider plate mod is real popular with the case-reed CRs 'cuz they can be a pain to get the jetting sorted.

Is EG putting sleeves in these as rumored, or still just boring and plating?

FRECNDY, on 11 June 2012 - 08:16 PM, said:

boring and plating. he also mods the coolant jackets. not really sure why you would want a sleeve in this day in age?

CaveMike buy 2008 ktm 300xcw on Sunday too. Him going have fun do comparison. 300xcw be plated, yz going just be for racing.