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Search: Posts Made By: jkv45
Forum: 1986 - 2007 Ninja 250R Tech Talk July 28th, 2022, 01:03 PM
Replies: 26
Views: 375
Posted By jkv45
I would say no. It pulls cleanly, revs fine...

I would say no.

It pulls cleanly, revs fine at high RPMs, and the plugs look good - so I wouldn't change the jetting.

Did it do the same before changing the plugs? There are lots of...
Forum: 1986 - 2007 Ninja 250R Tech Talk July 28th, 2022, 07:41 AM
Replies: 26
Views: 375
Posted By jkv45
Does it sound like it's backfiring? If you...

Does it sound like it's backfiring?

If you hold the throttle steady, at say 3000 RPMs when sitting in the garage, can you get it to do the same?

Have you adjusted the valves?

A compression...
Forum: 1986 - 2007 Ninja 250R Tech Talk July 27th, 2022, 06:29 AM
Replies: 26
Views: 375
Posted By jkv45
Hmmm....it sounds like it accelerates and idles...

Hmmm....it sounds like it accelerates and idles well.

Hard to pick out the odd noise, which sounds like wind noise mostly.

Just to clarify - the sound happens during steady throttle while...
Forum: 1986 - 2007 Ninja 250R Tech Talk July 26th, 2022, 01:07 PM
Replies: 26
Views: 375
Posted By jkv45
So the problem is when holding a consistent...

So the problem is when holding a consistent throttle position and RPM only?

If it ran the same before and after carb work, it could mean you didn't correct the problem when you were in the carbs....
Forum: 1986 - 2007 Ninja 250R Tech Talk July 26th, 2022, 06:29 AM
Replies: 26
Views: 375
Posted By jkv45
Try taking it out for a quick spin with the air...

Try taking it out for a quick spin with the air filter out and see how it runs.

It may run odd down low, but see if the top-end issue changes.

Over-oiling the air filter will cause odd...
Forum: 2008 - 2012 Ninja 250R Tech Talk July 18th, 2022, 07:25 AM
Replies: 2
Views: 119
Posted By jkv45
Danno pretty much has it covered. Doing carbs...

Danno pretty much has it covered. Doing carbs right isn't quick or easy.

Many times, hanging RPMs means a vacuum leak -but it can also be just a lean condition due to improper adjustments or...
Forum: 2008 - 2012 Ninja 250R Tech Talk July 5th, 2022, 06:51 AM
Replies: 12
Views: 164
Posted By jkv45
I would suspect the carb/jetting then. It...

I would suspect the carb/jetting then.

It should run close to 100 MPH indicated, given the time.

Because you said it revs higher when you back-off the throttle from wide open, it tells me it's...
Forum: 2008 - 2012 Ninja 250R Tech Talk July 4th, 2022, 01:40 PM
Replies: 12
Views: 164
Posted By jkv45
Are they aftermarket jets? Many kits contain...

Are they aftermarket jets? Many kits contain parts that are not 100% correct - even though they look right.

105 Kehin jets should be good with an airbox. Stock 38 Pilots are fine. Basic idle...
Forum: 1986 - 2007 Ninja 250R Tech Talk June 1st, 2022, 12:45 PM
Replies: 2
Views: 143
Posted By jkv45
If you are confident it's not a vacuum leak, I...

If you are confident it's not a vacuum leak, I would say something is hanging-up in one of the carbs.

There may be something that was not reassembled correctly.

See if you can determine if...
Forum: 1986 - 2007 Ninja 250R Tech Talk May 24th, 2022, 12:55 PM
Replies: 7
Views: 177
Posted By jkv45
This section on Ninja250.org will help -...

This section on Ninja250.org will help - https://faq.ninja250.org/wiki/Ninja250_Howto
Forum: 2008 - 2012 Ninja 250R Tech Talk May 18th, 2022, 06:45 AM
Replies: 7
Views: 185
Posted By jkv45
Are the needle jets protruding up into the...

Are the needle jets protruding up into the venturi?
Forum: General Motorcycling Discussion May 12th, 2022, 06:52 AM
Replies: 5
Views: 329
Posted By jkv45
Sta-Bil makes a couple additives to treat ethanol...

Sta-Bil makes a couple additives to treat ethanol gas if that's all you can get.

I believe it's Sta-Bil 360 and Sta-Bil Marine.
Forum: General Motorcycling Discussion May 11th, 2022, 06:53 AM
Replies: 5
Views: 329
Posted By jkv45
Use whatever is the lowest octane gas you can get...

Use whatever is the lowest octane gas you can get without ethanol.

No need for anything more than 87 for the Ninja, unless you have to go higher to get away from ethanol. Excessive octane reduces...
Forum: Ninjettes At Speed May 2nd, 2022, 10:56 AM
Replies: 132
Views: 5,222
Posted By jkv45
My son is doing most that to his new Ninja 400...

My son is doing most that to his new Ninja 400 race bike to shave some weight. Also new slipper clutch, Ohlins cartridges and shock, ECU flash, and on and on...

Hey Danno - are you going to be...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 28th, 2022, 06:26 AM
Replies: 17
Views: 347
Posted By jkv45
That's strange, because there's not that much...

That's strange, because there's not that much that would stop fuel flow between that point and the float valves.

Seems like the float valves would have to be stuck, or there is a significant...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 27th, 2022, 06:21 AM
Replies: 17
Views: 347
Posted By jkv45
Have you looked for a plugged in-line fuel...

Have you looked for a plugged in-line fuel filter?

https://faq.ninja250.org/wiki/How_do_I_install_a_fuel_filter%3F

https://faq.ninja250.org/wiki/File:Dirty_inline_filter.jpg
...
Forum: 2008 - 2012 Ninja 250R Tech Talk April 27th, 2022, 06:15 AM
Replies: 9
Views: 306
Posted By jkv45
Sta-Bil has a couple products that are designed...

Sta-Bil has a couple products that are designed to protect the fuel system from damage from ethanol fuel -

https://www.goldeagle.com/product/sta-bil-360-protection/
...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 26th, 2022, 11:34 AM
Replies: 8
Views: 235
Posted By jkv45
Sounds like you got it figured out, but as noted...

Sounds like you got it figured out, but as noted above - clean the entire caliper and clean/lube the sliding pins when you put in new pads.

Another thing that can make a rotor drag is rear wheel...
Forum: 2008 - 2012 Ninja 250R Tech Talk April 26th, 2022, 11:29 AM
Replies: 9
Views: 306
Posted By jkv45
I run ethanol-free in all my cycles, and add...

I run ethanol-free in all my cycles, and add Sta-Bil before storage.

Draining the float bowls, when and if you can, is a good idea if it's going to sit a while.

I've had ethanol-free gas with...
Forum: Ninjettes At Speed April 20th, 2022, 05:16 PM
Replies: 8
Views: 368
Posted By jkv45
Friend's RC is on its second engine with under...

Friend's RC is on its second engine with under 4000 mi. He's done some upgrades in the off season, so we'll see it any issues arise.

Oldest son just bought a Ninja 400 for the track. He's had it...
Forum: 2008 - 2012 Ninja 250R Tech Talk March 25th, 2022, 09:58 AM
Replies: 5
Views: 289
Posted By jkv45
Using a cheap carb kit off of ebay or amazon is...

Using a cheap carb kit off of ebay or amazon is rolling the dice.

Installing anything but OEM jets, and other significant parts, is asking for trouble.
Forum: 1986 - 2007 Ninja 250R Tech Talk March 25th, 2022, 06:19 AM
Replies: 7
Views: 352
Posted By jkv45
Unlike engine oil, air filter oil has a tackiness...

Unlike engine oil, air filter oil has a tackiness to it that traps dirt.

Adding oil to the filter (in a bag) and trying to squeeze it out usually leaves way too much, can block airflow, and will...
Forum: 1986 - 2007 Ninja 250R Tech Talk March 24th, 2022, 06:07 AM
Replies: 7
Views: 309
Posted By jkv45
Carbs need complete disassembly, deep cleaning,...

Carbs need complete disassembly, deep cleaning, rebuilding, and adjusting.

Save yourself the aggravation and send them to ducatiman.

Without proper cleaning, you are going to be fiddling with...
Forum: 1986 - 2007 Ninja 250R Tech Talk March 15th, 2022, 06:31 AM
Replies: 7
Views: 352
Posted By jkv45
I'm not aware of any differences in the air...

I'm not aware of any differences in the air filter from '99 to '06. The change was made in '08.

I like Uni Filters, and Twin Air as well.

You will need some air filter oil also. I like the...
Forum: 2008 - 2012 Ninja 250R Tech Talk March 7th, 2022, 07:45 AM
Replies: 53
Views: 1,290
Posted By jkv45
Carbs.

Carbs.
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