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Old 11-15-2011, 07:58 PM   #136
Rob.G
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Originally Posted by MrFurious View Post
Is Bill still in business? I read on another site that he was planning to close up shop at the end of the summer and it appears they shut down the website.
The website went down due to an issue with his ISP and the developer who created it. He has a new one under construction now and it should be up in the near future. He's still in business. I exchanged several emails with him about this last week.

Rob
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Old 11-15-2011, 10:03 PM   #137
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Good to know!
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Old 11-16-2011, 08:43 AM   #138
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Phew

I've been planning to purchase the 351 kit this winter, and was starting to look around to confirm pricing and get the ball rolling... and couldn't find his site anywhere. Definitely getting worried... 3 years on KLX w/5000+ miles now, been planning all along to mod up and really put a motor on this fun bike - and he disappeared.
Whoever gets Bill's new website address, please provide here - thanks!
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Old 11-16-2011, 09:13 AM   #139
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Yes, still going strong. I contacted him this morning here's what he said.

"Hello David,
I have not closed the shop. Still going strong, my web site went down last week because the person that was taking care of it decides he didn't want to mess with it any more. My son & grandson are making a new web site for me, hope to have it up & running by this week end. If you could help spread the word that I am still in busyness & doing well that would be appreciated. Glad you are happy with the 351 kit
Thanks
Bill "

I've been really surprised at the little KLX and how I've really come to like that bike, now that it's a 351cc. Riding in the rugged, rocky hills of the Kiamichi Mountains in S.E. Oklahoma last month the Dunlop GeoMax MX71's have held up quite well. It hasn't chunked off any knobbies like the tires on the other riders bikes. I also took my CR500 for the first time in this area and rode it one day. Man was it a hand full down there. Way more fun riding it on the sand at Little Sahara Oklahoma. It had an older Michelin rear tire and it ate off all the knobs on both out side rows. Riding on sharp rocks up and down steep hills will be a brutal test on any tire. I have 2200 miles on the KLX since Bill's kit and no problems.
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Old 11-18-2011, 07:56 PM   #140
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anyone here has the 351 kit on a Fuel injected KLX250 (or in this case D-tracker X)?
here in Brazil they are imported from thailand and are FI.

I wonder how well/easy to adjust
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Old 11-19-2011, 12:38 AM   #141
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Quote:
Originally Posted by uaza View Post
anyone here has the 351 kit on a Fuel injected KLX250 (or in this case D-tracker X)?
here in Brazil they are imported from thailand and are FI.

I wonder how well/easy to adjust
From what little I've read on Kawasaki Forums you need a JuiceBox or Power Commander with a custom fuel map. Those who have done it (mostly in the Philippines) report that the stock fuel injector seems to be up to the task at stock fuel pressure, so no need to upgrade the injector or pressure regulator.

Here's a link to a thread about a programmable ECU that's available in Thailand.
http://www.kawasakiforums.com/forum/...-klx250-36083/
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Old 01-22-2012, 10:04 AM   #142
danceswithcages
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Any word on Bill's new web address??

I've searched the web and can't come up with any info on where to buy his kit.

I'm seriously considering a KLX250 as my next bike, but only if the 351 kit is still available.
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Old 01-22-2012, 11:19 AM   #143
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http://www.bandbcyclerestoration.com/
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Old 01-22-2012, 11:30 AM   #144
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Thank you!
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Old 04-07-2012, 11:32 PM   #145
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Did you get your 351?

Did you get your 351 kit yet danceswithcages? I am just getting ready to install mine. Looking forward to seeing how this all works out.
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Old 02-16-2013, 03:22 PM   #146
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OK, I read all 10 pages but still have an elementary question. The 22HP shown on the dyno - I am assuming that is at the wheel correct? Cannot be at the crank? I mean, stock bike makes 18 HP so I would hope the 351 kit nets more than 4 HP.

Can anyone please confirm?
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Old 03-24-2013, 03:27 PM   #147
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Originally Posted by xxaarraa View Post
OK, I read all 10 pages but still have an elementary question. The 22HP shown on the dyno - I am assuming that is at the wheel correct? Cannot be at the crank? I mean, stock bike makes 18 HP so I would hope the 351 kit nets more than 4 HP.

Can anyone please confirm?
I see the dyno chart, and I agree that the 22hp seems a little weak. I think the point of the big-bore kit is more low-end torque than high-end power.
I think it's interesting that the 351 makes within 1 ft.-lb. of max torque at 3750 rpm. I also think it's worth noting that the chart is for a bike with the 351 kit, but with stock exhaust and stock carb.

I'd be interested in an incremental series that charted the benefits of the Mikuni carb and an aftermarket or KLX300 exhaust. It'd be nice to see a chart for a stock KLX250, too, but I realize dyno runs aren't free.

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Old 03-25-2013, 05:43 AM   #148
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Quote:
Originally Posted by Stumpy Pete View Post
I see the dyno chart, and I agree that the 22hp seems a little weak. I think the point of the big-bore kit is more low-end torque than high-end power.
I think it's interesting that the 351 makes within 1 ft.-lb. of max torque at 3750 rpm. I also think it's worth noting that the chart is for a bike with the 351 kit, but with stock exhaust and stock carb.

I'd be interested in an incremental series that charted the benefits of the Mikuni carb and an aftermarket or KLX300 exhaust. It'd be nice to see a chart for a stock KLX250, too, but I realize dyno runs aren't free.
I took my bike to Bill Blue and he did my conversion. His 351cc kit/ pumper carburetor, my supplied full FMF Q4 and KLX snorkel. I've put about 4,000 miles on it without any problems. Don't know what the horsepower is but I really enjoy the KLX now. It's my go to fun bike. I did drop one tooth on the front sprocket for more low end, runs comfortable at 55 mph but it will still do 70 mph for short bursts.
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Old 03-25-2013, 08:31 AM   #149
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Originally Posted by xxaarraa View Post
OK, I read all 10 pages but still have an elementary question. The 22HP shown on the dyno - I am assuming that is at the wheel correct? Cannot be at the crank? I mean, stock bike makes 18 HP so I would hope the 351 kit nets more than 4 HP.

Can anyone please confirm?
The short answer is yes, the 351 bore kit alone will get you roughly five hp and five ft-lbs.

Stock: 19.30hp, 13.12 ft-lb


With big-bore kit: 24.58 hp and 18.75 ft-lbs


More power and torque is available with further modifications.

http://www.kawasakiforums.com/forum/...e2/#post482824

I like that much of the gain is available between 4000 and 5000 rpms. I haven't done any of this yet, but I'm thinking about starting with the piston and cylinder and possibly doing the pumper carb later.
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Old 05-14-2014, 07:58 AM   #150
corvettechris
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We just finished a 351 upgrade on our KLX250.

Here is our experience and recommendations for anyone contemplating this upgrade.

We are at 4,500 feet so our jetting and power issues I bet are different than most. When we're riding the mountains at 5000+ feet, the stock KLX just wasn't doing it. Often struggling to maintain 55 mph on uphills. That is with a light rider even and with the dynotjet jet kit. So we decided it was time for MORE POWER CAPTAIN!

We started with the Bill Blue 351 kit. I've done several car and motorcycle rebuilds, and had already adjusted the vales on the KLX, so it only took me an hour to disassemble the bike. Putting it back together took me about 4 hours.

I changed the jetting up two main jet sizes as Bill suggested. It wasn't enough. But we were already a bit lean due to the elevation. Right now we're running a 128 (which is now a bit rich, I'll get to that later). We rode 100 miles to break it in a couple of days later. We could tell that it had quite a bit more power and we gained 10 mph top speed, with the only change being the 351 and jetting. I felt that the bike was still overly plugged up with the stock exhaust, so we ordered the FMF Q4.

We received the Q4 and did the install in 10 minutes. What a huge change. Now the bike has a heck of a lot more power everywhere through the range. And now, with stock gearing it makes 90mph!

Now, with the new pipe, its a bit rich and needs leaned out a little bit, but it is running great. I am not of the opinion that the carb itself needs to be changed. My best friend has been semi-professionally drag racing bikes for years and he agrees that the carb should be fine.

Overall, this upgrade cost about $1,000 which is a lot, but doing it in stages made it more palatable.

A friend of ours has the same KLX and I was telling him yesterday, I think the way I would recommend it now to anyone considering the upgrade is, buy the Q4 (with a quiet core) first, then see how the power is, then if you need more, do the 351 upgrade.

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