350 cc big bore kit for KLX250, Ready to ship!! - Page 2

Bake · 01-02-2009, 08:49 PM

Yeah, we went for a 110 mile ride...which started out as a 60 mile test ride, but then I got us plumb lost while in the boondocks of the Flint Hills, headed clear out the opposite way from where we wanted to be going, and I had to beg a farmer kid for gas for the 3 of us, and we about froze our behinds off, but yeah, we rode 110 miles on the new 351 kits.

Big country out there. Perfect for a test ride.

Chrisbarnes1 · 01-03-2009, 12:12 AM

Seeing all the goodies being made available, and in particular the pumper carb, I thought I would share my difficulties with the dreaded CV carb.

My son recently bought a mid 90s KLX---and the bottom line was that we could never get the carburation right--it got so bad that we suspected ECU, valves etc--but all these checked out ok. I also couldn't find anything really wrong with the CV carb apart from a bit of slide wear. In desperation I unbolted the slide carb off my new Honda CRF230 and tried it on the KLX. It fired straight up, ticked over smoothly and revved cleanly with no adjustments. Money is always tight so I settled for a pumper carb off a mid 80s Honda CB250RS (a single cylinder 4 valve motor of about the same power as the KLX). Good old e-bay got a carb for $40 in good condition. The big issue was the throttle quadrant being on the LHS making throttle cable runs difficult (solved by going to single cable and making our own abutment bracket). The Honda carb also has a cable choke--so now we have easy handlebar operation ( a cheap car cable assy did the job for $6). I had to heat the tank and create a slight depression in it to clear the top of the carb--but apart from that it was fairly straightforward. Starting is now a first kick afair, it idles reliably, accelerates VERY well and seems to require a slightly leaner needle position than the Honda for smooth part throttle operation--no jet changes so far. I'm still at a loss as to why the CV carb was so bad--and would really like the pumper carb on offer (with the the throttle quadrant in the right place!)---but nevertheless the old pumper carb from the Honda is working well--and responds to adjustments!

Regards, CB

Quote:

Originally Posted by Gadget Boy

I got my pumper carb and braided lines this week.. top quality and service!

Bill & Jo Ann Blue · 01-05-2009, 07:16 PM

Haven't got a price on the kit yet hopefully tomorrow spent some time on the phone with the vendors today to finalize the prices of the sleeve, piston & gaskets.
Something came up today didn't run the bike on the dyno will see when we can schedule another try.

Bill & Jo Ann Blue · 01-07-2009, 08:15 PM

I now have a price for the 351 kit.
$498.50 + $14.95 Insurance + $6.50 Shipping = $519.95 if shipped in the U.S.A.
The price is subject to change depending on vendor increases beyond my control.
Hopefully parts wil be ordered in a couple of weeks.

mi_dualsporter · 01-08-2009, 06:12 AM

Quote:

Originally Posted by Bill & Jo Ann Blue

I now have a price for the 351 kit.
$498.50 + $14.95 Insurance + $6.50 Shipping = $519.95 if shipped in the U.S.A.
The price is subject to change depending on vendor increases beyond my control.
Hopefully parts wil be ordered in a couple of weeks.

This is great news! Hopefully I'll have the cash by spring for the 351 kit!

Kawidad · 01-08-2009, 02:43 PM

Good job!

Bill & Jo Ann Blue · 01-10-2009, 08:20 PM

Well, I finally got to put my bike with the 351 kit on the dyno this afternoon.
Baker will post a copy of the dyno chart after this post.
The maximum horsepower came to 26.55 at 7,100 RPM; maximum torque came to 21.11 at 5,800 RPM. This was with the following equipment in place:
Stock KLX 250 header, Super Trapp slip-on muffler w/5 discs, Mikuni pumper flat slide TM33/34 carb. Kenda K270 5.10-18 rear tire. Stock gearing & 6th gear run.
Pilot jet 40, main jet 140, air box lid on, KDX 200 snorkle, air box backfire screen removed, crankcase vent modified.
Stock valves, ports cleaned, 351 c.c. piston 12.5:1 compression on regular pump gas, no detonation or ping.
As a note, I changed the stock header to a Power Bomb header for another run on the dyno, but actually lost 1/10th horsepower.

Bake · 01-10-2009, 08:31 PM

TheGreatDane · 01-12-2009, 05:45 PM

GREAT news about the 351 kit!
Any overheating issues with this setup?
Do you know when you might have the first kit ready for retail?

TheGreatDane · 01-12-2009, 05:51 PM

I'm also looking to buy the carb and the 351cc kit when avaioable.
Please advise.

Karsten@Keystonebenefitconsultants.com

Quote:

Originally Posted by Bill & Jo Ann Blue

Hello All,
I finally got a vendor to work with me on the T-Handle adjuster screw. The cost will be $14.95 ea. + shipping and they will be here next Fiday. If you want to purchase one of these T-Handle adjuster screws, you can contact me at my e-mail address or PM. I have ordered 12 for now, if more are needed, they'll be available. This makes adjusting the air screw a breese
Bill

Mknpwr · 01-13-2009, 10:15 AM

let me know when you have them ready!

Bake · 01-24-2009, 08:17 PM

Bill helped me install my 350 kit today. My bike is #3, last of the development engines.

It really is a pretty easy job to do. You don't have to remove the radiators to do it. It took us about 2 1/2 hours without rushing.

PM Bill for the kits, they will be available in a few weeks.

She started right up. I'll be putting it through the first heat cycles this weekend.

GB · 01-27-2009, 07:12 AM

Quote:

Originally Posted by TheGreatDane

I'm also looking to buy the carb and the 351cc kit when avaioable.
Please advise.

Karsten@Keystonebenefitconsultants.com

I've moved this post from the big KLX250S thread in Thumpers, so Bill can spot it. You may also wish to contact him directly.

Bake · 02-01-2009, 03:18 PM

I have my 350 kit installed, and so far I've ridden 85 miles on it, breaking it in gradually. I am using the stock carb and the stock pipe. The generally agreed upon easy mods, the Dynojet needle, a different pilot and a different main jet. No screen and the KDX snorkle.

Off road, where I'm using 4K-6K rpm, it's a beast. No, it's not a Husky 650, but compared to the stock engine, it's a different motorcycle entirely.

My engine is a test bed for several configurations, in the interest of helping people.

TrailCruiser · 02-02-2009, 01:57 PM

Quote:

Originally Posted by Bill & Jo Ann Blue

The maximum horsepower came to 26.55 at 7,100 RPM; maximum torque came to 21.11 at 5,800 RPM.
As a note, I changed the stock header to a Power Bomb header for another run on the dyno, but actually lost 1/10th horsepower.

I'm surprised the HP peaked at only 7,100 rpm. Where does the stock 250 peak by comparison?

Is anyone surprised that the larger header actually lost HP?

01-02-2009, 08:49 PM	#16
Bake adventurer Joined: May 2005 Oddometer: 10,489	Yeah, we went for a 110 mile ride...which started out as a 60 mile test ride, but then I got us plumb lost while in the boondocks of the Flint Hills, headed clear out the opposite way from where we wanted to be going, and I had to beg a farmer kid for gas for the 3 of us, and we about froze our behinds off, but yeah, we rode 110 miles on the new 351 kits. Big country out there. Perfect for a test ride. Bake screwed with this post 01-02-2009 at 08:58 PM

01-08-2009, 02:43 PM	#21
Kawidad Beastly Adventurer Joined: Jul 2005 Location: Central Coast, Cal Oddometer: 3,821	Good job! __________________ "Deeply flawed people make deeply flawed decisions."

01-12-2009, 05:45 PM	#24
TheGreatDane The Vining Joined: Mar 2008 Location: MC Valhalla Oddometer: 3	351cc GREAT news about the 351 kit! Any overheating issues with this setup? Do you know when you might have the first kit ready for retail?

01-13-2009, 10:15 AM	#26
Mknpwr Have you seen my bike? Joined: May 2005 Location: Planning my next ride... Oddometer: 519	I'm interested as well let me know when you have them ready! __________________ Trust, but verify...

01-24-2009, 08:17 PM	#27
Bake adventurer Joined: May 2005 Oddometer: 10,489	Bill helped me install my 350 kit today. My bike is #3, last of the development engines. It really is a pretty easy job to do. You don't have to remove the radiators to do it. It took us about 2 1/2 hours without rushing. PM Bill for the kits, they will be available in a few weeks. She started right up. I'll be putting it through the first heat cycles this weekend. Bake screwed with this post 02-01-2009 at 10:20 PM

01-05-2009, 07:16 PM	#18
Bill & Jo Ann Blue ^OP Adventurer Joined: Nov 2005 Location: Wichita, Kansas Oddometer: 30	Haven't got a price on the kit yet hopefully tomorrow spent some time on the phone with the vendors today to finalize the prices of the sleeve, piston & gaskets. Something came up today didn't run the bike on the dyno will see when we can schedule another try.

01-07-2009, 08:15 PM	#19
Bill & Jo Ann Blue ^OP Adventurer Joined: Nov 2005 Location: Wichita, Kansas Oddometer: 30	I now have a price for the 351 kit. $498.50 + $14.95 Insurance + $6.50 Shipping = $519.95 if shipped in the U.S.A. The price is subject to change depending on vendor increases beyond my control. Hopefully parts wil be ordered in a couple of weeks.

01-10-2009, 08:20 PM	#22
Bill & Jo Ann Blue ^OP Adventurer Joined: Nov 2005 Location: Wichita, Kansas Oddometer: 30	Well, I finally got to put my bike with the 351 kit on the dyno this afternoon. Baker will post a copy of the dyno chart after this post. The maximum horsepower came to 26.55 at 7,100 RPM; maximum torque came to 21.11 at 5,800 RPM. This was with the following equipment in place: Stock KLX 250 header, Super Trapp slip-on muffler w/5 discs, Mikuni pumper flat slide TM33/34 carb. Kenda K270 5.10-18 rear tire. Stock gearing & 6th gear run. Pilot jet 40, main jet 140, air box lid on, KDX 200 snorkle, air box backfire screen removed, crankcase vent modified. Stock valves, ports cleaned, 351 c.c. piston 12.5:1 compression on regular pump gas, no detonation or ping. As a note, I changed the stock header to a Power Bomb header for another run on the dyno, but actually lost 1/10th horsepower.

01-10-2009, 08:31 PM	#23
Bake adventurer Joined: May 2005 Oddometer: 10,489

02-01-2009, 03:18 PM	#29
Bake adventurer Joined: May 2005 Oddometer: 10,489	I have my 350 kit installed, and so far I've ridden 85 miles on it, breaking it in gradually. I am using the stock carb and the stock pipe. The generally agreed upon easy mods, the Dynojet needle, a different pilot and a different main jet. No screen and the KDX snorkle. Off road, where I'm using 4K-6K rpm, it's a beast. No, it's not a Husky 650, but compared to the stock engine, it's a different motorcycle entirely. My engine is a test bed for several configurations, in the interest of helping people. Bake screwed with this post 02-01-2009 at 10:17 PM

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