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Forum: 2008 - 2012 Ninja 250R Tech Talk Today, 05:43 AM
Replies: 12
Views: 180
Posted By Triple Jim
A compression test will answer that.

A compression test will answer that.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 14th, 2024, 03:41 PM
Replies: 10
Views: 334
Posted By Triple Jim
Starting cold without the enrichers could mean...

Starting cold without the enrichers could mean the idle screws are set a little too rich.

I'm not sure what you mean about compression, but if the compression is within spec, at least the valves...
Forum: 2008 - 2012 Ninja 250R Tech Talk April 13th, 2024, 11:26 AM
Replies: 12
Views: 180
Posted By Triple Jim
I don't think a gunky piston crown is the source...

I don't think a gunky piston crown is the source of your trouble.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 13th, 2024, 11:25 AM
Replies: 12
Views: 220
Posted By Triple Jim
If you have the stock center stand, it lifts the...

If you have the stock center stand, it lifts the rear wheel off the ground. Once on the center stand, a jack carefully placed to lift the front of the engine, with a block of wood to protect the...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 12th, 2024, 07:18 PM
Replies: 8
Views: 169
Posted By Triple Jim
Coolant level doesn't drop when it circulates. ...

Coolant level doesn't drop when it circulates. It drops a little when the engine is cold, and rises when it's hot. You won't get far if it's not circulating.

Unexplained stalling is sometimes...
Forum: 2008 - 2012 Ninja 250R Tech Talk April 12th, 2024, 08:46 AM
Replies: 12
Views: 180
Posted By Triple Jim
Here's some information about the passages in the...

Here's some information about the passages in the carbs: https://n4mwd.blogspot.com/2013/10/secret-ninja-250-carburetor-passages.html

Or PM ducatiman and ask about his service. He's expert in...
Forum: 2008 - 2012 Ninja 250R Tech Talk April 12th, 2024, 05:25 AM
Replies: 12
Views: 180
Posted By Triple Jim
Hello Bryce, welcome! You mentioned...

Hello Bryce, welcome!

You mentioned "throttle bodies", but I assume this is a US bike with two carburetors, correct?

Don't use starter fluid. The delicate diaphragms in the carbs can be...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 10th, 2024, 02:46 PM
Replies: 8
Views: 169
Posted By Triple Jim
That's fine. You could try shifting to neutral...

That's fine. You could try shifting to neutral instead and see if there's any difference. If the clutch is not fully releasing, the drag could stall the engine if it's in first gear and you stop.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 10th, 2024, 02:11 PM
Replies: 8
Views: 169
Posted By Triple Jim
As long as it rises a little it's probably...

As long as it rises a little it's probably working, but if you let it idle in your driveway for a while, it should eventually rise noticeably.



At this point I can't tell you why that happened....
Forum: 1986 - 2007 Ninja 250R Tech Talk April 10th, 2024, 01:15 PM
Replies: 12
Views: 220
Posted By Triple Jim
Welcome to the board, Will! Fluctuating idle...

Welcome to the board, Will!

Fluctuating idle speed could indicate misadjusted or dirty carbs, or out of adjustment valves. If you don't know when the valves were last adjusted, it would be worth...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 10th, 2024, 01:09 PM
Replies: 8
Views: 169
Posted By Triple Jim
Exactly when did the engine stop running? Was it...

Exactly when did the engine stop running? Was it it when you first pulled in the clutch lever, or when you let it back out? The problem could be related to the safety switches. Are you sure the...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 8th, 2024, 01:12 PM
Replies: 12
Views: 245
Posted By Triple Jim
I wonder if they were stock coils that gave you...

I wonder if they were stock coils that gave you trouble. I don't hear about coil failures here.
Forum: 2008 - 2012 Ninja 250R Tech Talk April 8th, 2024, 05:30 AM
Replies: 1
Views: 105
Posted By Triple Jim
This kind of thing happens everywhere... some...

This kind of thing happens everywhere... some places worse than others. That's why I almost never let someone else do work on my vehicles.
Forum: 2008 - 2012 Ninja 250R Tech Talk April 7th, 2024, 05:51 PM
Replies: 1
Views: 71
Posted By Triple Jim
Left coil: black wire top, red wire bottom ...

Left coil: black wire top, red wire bottom
Right coil: green wire top, red wire bottom

Assuming it's the same as my pregen, that is.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 7th, 2024, 02:44 PM
Replies: 7
Views: 219
Posted By Triple Jim
Check the flow through the petcock during...

Check the flow through the petcock during cranking.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 6th, 2024, 07:17 PM
Replies: 1
Views: 83
Posted By Triple Jim
I could be something as simple as a clogged fuel...

I could be something as simple as a clogged fuel filter or tank vent.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 6th, 2024, 03:44 PM
Replies: 12
Views: 245
Posted By Triple Jim
Sorry, I had a brain fart! You're right. I'll...

Sorry, I had a brain fart! You're right. I'll fix the post for future searchers. I had tube amplifier output transformers on my mind. :)

I was the one who posted the manual supplement for you.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 6th, 2024, 02:17 PM
Replies: 12
Views: 245
Posted By Triple Jim
Edit: deleted wrong information!

Edit: deleted wrong information!
Forum: 1986 - 2007 Ninja 250R Tech Talk April 6th, 2024, 02:16 PM
Replies: 10
Views: 334
Posted By Triple Jim
it seems like the problem could be valves or...

it seems like the problem could be valves or clogged pilot circuits in your carbs.

https://n4mwd.blogspot.com/2013/10/secret-ninja-250-carburetor-passages.html
Forum: 1986 - 2007 Ninja 250R Tech Talk April 6th, 2024, 02:13 PM
Replies: 2
Views: 67
Posted By Triple Jim
The problem happens if one of the carbs develops...

The problem happens if one of the carbs develops a leaking float valve. Then the engine's crankcase can fill up with gasoline, causing you lots of grief. It could even pour gasoline onto your...
Forum: 1986 - 2007 Ninja 250R Tech Talk April 5th, 2024, 07:32 PM
Replies: 12
Views: 245
Posted By Triple Jim
I'm asking what the battery voltage is during...

I'm asking what the battery voltage is during cranking. That can tell us if your weak spark is due to low voltage.
Forum: 2008 - 2012 Ninja 250R Tech Talk April 5th, 2024, 07:31 PM
Replies: 6
Views: 283
Posted By Triple Jim
Most aren't like that, as far as I know. Mine...

Most aren't like that, as far as I know. Mine has required only basic maintenance.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 5th, 2024, 01:52 PM
Replies: 12
Views: 245
Posted By Triple Jim
What is the battery voltage while you're...

What is the battery voltage while you're cranking? My guess is it's dropping a lot under load.
Forum: 1986 - 2007 Ninja 250R Tech Talk April 5th, 2024, 01:51 PM
Replies: 5
Views: 317
Posted By Triple Jim
Bad coil, or wrong gap?

Bad coil, or wrong gap?
Forum: 1986 - 2007 Ninja 250R Tech Talk April 4th, 2024, 04:10 PM
Replies: 7
Views: 219
Posted By Triple Jim
Welcome to the board, John! A compression...

Welcome to the board, John!

A compression test will tell you if the valves are all closing properly. When these engines have been run a lot without a valve adjustment, the valve lash will go to...
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