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Forum: General Motorcycling Discussion February 20th, 2024, 08:04 AM
Replies: 2
Views: 1,253
Posted By jkv45
My buddies and I watch the entire series (Moto3,...

My buddies and I watch the entire series (Moto3, 2, GP) weekly, and disagree on how Marquez will start the season.

I think he will immediately be in the hunt, but my buddies think he's...
Forum: 1986 - 2007 Ninja 250R Tech Talk December 21st, 2023, 07:34 AM
Replies: 1
Views: 684
Posted By jkv45
Welcome! Yes - you are on the right track. ...

Welcome!

Yes - you are on the right track.

Most will agree that the engine runs best with an original airbox.

In addition, it's very possible you may need to remove and clean the carbs,...
Forum: 2008 - 2012 Ninja 250R Tech Talk November 13th, 2023, 07:58 AM
Replies: 18
Views: 2,018
Posted By jkv45
I would put a gauge on the line to check fuel...

I would put a gauge on the line to check fuel pressure.

More than any other part I've heard of, aftermarket fuel pumps tend to be bad, mostly because they do not provide adequate fuel pressure to...
Forum: 2018+ Ninja 400 General Discussion October 19th, 2023, 11:26 AM
Replies: 5
Views: 7,593
Posted By jkv45
It looked encouraging - until you look at the...

It looked encouraging - until you look at the frame.

The frame looks like a standard Ninja 400 frame. Welded-on tail section too.

Pass...
Forum: Ninjettes At Speed September 25th, 2023, 07:16 PM
Replies: 12
Views: 8,766
Posted By jkv45
What tracks are you running, Danno?

What tracks are you running, Danno?
Forum: New Members July 5th, 2023, 08:51 AM
Replies: 17
Views: 939
Posted By jkv45
I'd say go back to the stock airbox and use the...

I'd say go back to the stock airbox and use the data Danno provided to get your jetting optimized.

Know that the jet numbers on Dynojet kits are proprietary, and do not match factory Kehin...
Forum: The Ex-Ninjetters Lair November 23rd, 2022, 02:00 PM
Replies: 10
Views: 1,560
Posted By jkv45
Don't go Danno! I've never personally had a...

Don't go Danno!

I've never personally had a Ninja 250 (my sons have), and they haven't kicked me out yet.

Have you thought about running a Supermoto?

Son in SoCal just bought a '22 Husky in...
Forum: 1986 - 2007 Ninja 250R Tech Talk October 6th, 2022, 04:02 PM
Replies: 3
Views: 563
Posted By jkv45
Sounds like a restriction in the fuel system to...

Sounds like a restriction in the fuel system to me.

Petcock screens in the tank, petcock, filter at the inlet of the carbs, are a few places where there could be debris restricting flow.

When...
Forum: 2008 - 2012 Ninja 250R Tech Talk October 6th, 2022, 08:55 AM
Replies: 8
Views: 764
Posted By jkv45
Not sure what the cause/answer is here. I...

Not sure what the cause/answer is here.

I would change the oil, using 10W-40, and fill no more than halfway up the sightglass.

Clean the airbox well, and keep an eye on it.

Oil does work its...
Forum: 2008 - 2012 Ninja 250R Tech Talk October 5th, 2022, 07:57 AM
Replies: 8
Views: 764
Posted By jkv45
I would expect that gas has made its way into the...

I would expect that gas has made its way into the oil if it's still pumping into the airbox.

They do normally blow some oil into the airbox, especially with extended high RPM running, but it...
Forum: 1986 - 2007 Ninja 250R Tech Talk August 16th, 2022, 06:30 AM
Replies: 19
Views: 763
Posted By jkv45
Make sure you check this.

Make sure you check this.
Forum: 2008 - 2012 Ninja 250R Tech Talk August 16th, 2022, 06:28 AM
Replies: 43
Views: 2,183
Posted By jkv45
Oy! That's a project! You have a pretty...

Oy! That's a project!

You have a pretty good list going.

As Danno noted - I'd start with the engine.

Oil/filter, air filter, coolant, probably new battery, drain fuel and floatbowls,...
Forum: 1986 - 2007 Ninja 250R Tech Talk August 15th, 2022, 11:41 AM
Replies: 19
Views: 763
Posted By jkv45
It's odd that it just ran fine not long ago. ...

It's odd that it just ran fine not long ago.

Checking the valves is a good idea, though unusual, it's possible a rocker popped off or there's something unusual going on under the cover...

If...
Forum: 1986 - 2007 Ninja 250R Tech Talk August 15th, 2022, 06:13 AM
Replies: 19
Views: 763
Posted By jkv45
Hmmm...you have covered a lot of the possible...

Hmmm...you have covered a lot of the possible issues.

After a starting attempt, have you looked at the plugs to see if they are wet or dry?

Are you charging between attempts?

How old is the...
Forum: 1986 - 2007 Ninja 250R Tech Talk August 15th, 2022, 06:08 AM
Replies: 5
Views: 531
Posted By jkv45
As you stated - check for a vacuum leak. ...

As you stated - check for a vacuum leak.

Have you made fine adjustments to the idle mixture?

Have the carbs been synced recently?

I would do those things before pulling the carbs.
Forum: 1986 - 2007 Ninja 250R Tech Talk July 28th, 2022, 01:03 PM
Replies: 26
Views: 1,750
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: 1,750
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: 1,750
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: 1,750
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: 1,750
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: 522
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: 702
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: 702
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: 361
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: 403
Posted By jkv45
This section on Ninja250.org will help -...

This section on Ninja250.org will help - https://faq.ninja250.org/wiki/Ninja250_Howto
Showing results 1 to 25 of 1000

 
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