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Search: Posts Made By: dan151
Forum: 2008 - 2012 Ninja 250R Tech Talk June 22nd, 2023, 02:29 PM
Replies: 61
Views: 2,201
Posted By dan151
Finally located the problem, found the "needle...

Finally located the problem, found the "needle jets" to be missing from both carburetors. It appears the last owner did in fact disassemble the carburetors for cleaning and failed to reinstall the...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 07:45 PM
Replies: 61
Views: 2,201
Posted By dan151
Mixture screws were reset on a fully warmed...

Mixture screws were reset on a fully warmed engine after each change was made to the carburetors in order to achieve the target idle. 2.75 - 3 turns is usually what it takes to reach target idle.
...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 02:56 PM
Replies: 61
Views: 2,201
Posted By dan151
The bike appears to be running rich under 50%...

The bike appears to be running rich under 50% throttle. The plugs are blackened with soot, occasional black soot out of the tailpipe and you can smell the rich mixture in the exhaust fumes.
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 01:52 PM
Replies: 61
Views: 2,201
Posted By dan151
I agree and yes, if you take off with 50%+...

I agree and yes, if you take off with 50%+ throttle its beyond the problem area so the bike accelerates just fine. Same applies for cruising at 50%+ throttle.

What I don't understand is if the...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 01:48 PM
Replies: 61
Views: 2,201
Posted By dan151
Just installed two #4 washers on each needle with...

Just installed two #4 washers on each needle with no improvement to the symptoms. The bike runs noticeable richer than before above 50% throttle which makes sense given the change. The bike ran great...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 11:17 AM
Replies: 61
Views: 2,201
Posted By dan151
Take off at anything less than 50% throttle...

Take off at anything less than 50% throttle results in a bog which recovers most of the time on level ground with slowly increasing throttle input. If on an incline, it will bog down severely and...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 14th, 2023, 11:02 AM
Replies: 61
Views: 2,201
Posted By dan151
Here are the new float levels, set with the carb...

Here are the new float levels, set with the carb leveled and stationary off the bike. Following reinstallation, the symptoms remain unchanged.
Forum: 2008 - 2012 Ninja 250R Tech Talk June 6th, 2023, 07:22 PM
Replies: 61
Views: 2,201
Posted By dan151
Here are the float level test results. Carbs...

Here are the float level test results. Carbs installed, bike secured upright with the engine not running and the petcock on the prime setting. Both floats were set to 17mm during the last disassembly...
Forum: 2008 - 2012 Ninja 250R Tech Talk June 3rd, 2023, 01:54 PM
Replies: 61
Views: 2,201
Posted By dan151
Just installed the #35 pilot and #95 main jets....

Just installed the #35 pilot and #95 main jets. After a warm up, target idle was achieved with 3.5 turns of the mixture screws.

Proceeded on a 10 mile ride with speeds averaging 30-40 mph and rpms...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 31st, 2023, 06:29 AM
Replies: 61
Views: 2,201
Posted By dan151
Thanks Bob, I'm hopeful but not expecting a...

Thanks Bob, I'm hopeful but not expecting a drastic change with the replacement jets given the severity of the rich running condition but it will be a good starting point to continue testing and...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 30th, 2023, 01:38 PM
Replies: 61
Views: 2,201
Posted By dan151
Excellent, thank you for the quick response and...

Excellent, thank you for the quick response and recommendation! I will report back once I have completed the above work.
Forum: 2008 - 2012 Ninja 250R Tech Talk May 30th, 2023, 01:22 PM
Replies: 61
Views: 2,201
Posted By dan151
As suggested, I'm going to try another carburetor...

As suggested, I'm going to try another carburetor cleaning, fluid fuel level check, and step down a size in the pilot and main jet. The stock Keihin CVK30 carbs on this bike have a #38 pilot and #98...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 29th, 2023, 06:29 AM
Replies: 61
Views: 2,201
Posted By dan151
The bike was completely untouched when I bought...

The bike was completely untouched when I bought it, factory paint markings on screws and bolts still. The thought of drilled jets did cross my mind when the carburetors were disassembled. Although I...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 27th, 2023, 02:33 PM
Replies: 61
Views: 2,201
Posted By dan151
The oil level was high when I first got the bike...

The oil level was high when I first got the bike and I had to siphon out about 1/2 of a quart of oil so that it was at the proper level on a warm engine. It did not smell contaminated to me.

I...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 27th, 2023, 11:16 AM
Replies: 61
Views: 2,201
Posted By dan151
Just tried opening the choke slowly as the...

Just tried opening the choke slowly as the symptoms start and it has no effect. The bike bogs down at steady throttle below 3000 rpms and dies out. If you hold engine speed at above 3000 rpms, it...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 27th, 2023, 10:10 AM
Replies: 61
Views: 2,201
Posted By dan151
Only 400 miles on the bike, I received no service...

Only 400 miles on the bike, I received no service history but would gather they are untouched given the low mileage. If I had to guess it probably has the original engine oil as well. I'm guessing it...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 27th, 2023, 08:33 AM
Replies: 61
Views: 2,201
Posted By dan151
Just tried running with the air filter removed...

Just tried running with the air filter removed with the side cover on. No change in symptoms. Bogging, stuttering and light black soot out the tail pipe .

Once it starts bogging it struggles to...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 27th, 2023, 07:51 AM
Replies: 61
Views: 2,201
Posted By dan151
Needle valves and seats are spotless and...

Needle valves and seats are spotless and confirmed functioning properly. No damage to the rubber cone tips. I tested them when the carburetor was off the bike. With very light compressed air, no flow...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 26th, 2023, 05:41 PM
Replies: 61
Views: 2,201
Posted By dan151
Thank you! I just disassembled the carbs and...

Thank you! I just disassembled the carbs and meticulously cleaned them following the diagrams you provided. I reset the float bowls to exactly 17mm and 2.5 turns out on the mixture screws.

I was...
Forum: 2008 - 2012 Ninja 250R Tech Talk May 25th, 2023, 02:36 PM
Replies: 61
Views: 2,201
Posted By dan151
2012 Ninja 250R Bogging/Sputtering On Take Off Running Rich

Hi Folks,
Took a chance and bought a low mileage 100% stock non-running 250r that sat garaged for a number of years. New battery and fresh gas, bike started but died when the choke was closed....
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