Operating temp. question

JCCJMM_ · September 17th, 2010, 08:45 AM

I know it's been a while since I have been on here......working 2 jobs and doing ALOT of riding to get there.

I posted this question on ninja250.org and got mixed feedback.

So, here goes: 2007 with just over 12,000 miles. I do all maintenance; valves last adjusted around 6,000 miles (I know its time again) to the polar "loose end" of the spectrum. Carbs never pulled/cleaned, but have run some B12 in the gas recently. Carbs synced once, at around 1000 miles. Bike has not sat for more than 3 days without being ridden since last December.

Issue: Here over the last month or so, the bike wants to stall when coming to a stop at the beginning of the ride. I have tried letting it warm up with the choke.....which helps a bit, but I know better than to let it warm up idling. Once the bike gets up to temp, it runs great at any rpm/speed. Idles fine...no problems when warm.

This morning on the way to my first job, I let it run with choke for about a minute then rode off. At my first stop it died, even with enrichner on. It was difficult to get it restarted and I had to blip the throttle at the first 3 lights I came to. I find it difficult to set the enrichner properly for use until it will idle without it. After about 5 solid minutes of riding, it finally ran/idled fine. No problems with warm starts afterwards either.

What are the possibilities here? It is certainly temperature related.....never hesitates or acts strange after a good 5 min of riding. Motor also sounds normal. Ideas?? Thanks a bunch for any input!

Snake · September 17th, 2010, 08:55 AM

Do a valve job and see if the problem goes away.

kkim · September 17th, 2010, 12:02 PM

Quote:

Originally Posted by Snake

Do a valve job and see if the problem goes away.

I agree. If nothing else, you'll be up to date on your service.

I do believe I've read of this problem before on this forum and the solution was a valve adjustment.

bob706 · September 17th, 2010, 12:27 PM

+1 for valve adjustment. Have you checked the fuel filter?

JCCJMM_ · September 29th, 2010, 10:04 AM

***UPDATE***

Worked on the valves Monday night. 2 exhaust valve clearances (same cylinder) were too tight.

Also, electrodes on plugs were worn. Seemed odd for only 12,000 miles...plugs were clean though.

Adjusted 2 valves, popped in new plugs, changed oil/filter, cleaned air filter and she is riding like new again.

My only question is, was it the valve lash or the plugs that caused the problem???

Thanks again guys.

kkim · September 29th, 2010, 11:59 AM

what plugs are you using/was in there?

JCCJMM_ · September 30th, 2010, 07:39 AM

Old plugs were factory installed, new ones are same brand/model. In addition to the worn electrodes, the old ones had too wide of a gap too.

On another note, my bike is running better than it ever has! I am beginning to wonder if I mis-adjusted the 2 exhaust valves the last time I worked on them. I just never thought that 2 exhaust valves being a bit too tight would cause the bike to run as poorly as it was.

September 17th, 2010, 08:45 AM	#1
JCCJMM_ ninjette.org member Name: John-Michael Location: Texas Join Date: Aug 2008 Motorcycle(s): 2007 EX250 Posts: 133	Operating temp. question I know it's been a while since I have been on here......working 2 jobs and doing ALOT of riding to get there. I posted this question on ninja250.org and got mixed feedback. So, here goes: 2007 with just over 12,000 miles. I do all maintenance; valves last adjusted around 6,000 miles (I know its time again) to the polar "loose end" of the spectrum. Carbs never pulled/cleaned, but have run some B12 in the gas recently. Carbs synced once, at around 1000 miles. Bike has not sat for more than 3 days without being ridden since last December. Issue: Here over the last month or so, the bike wants to stall when coming to a stop at the beginning of the ride. I have tried letting it warm up with the choke.....which helps a bit, but I know better than to let it warm up idling. Once the bike gets up to temp, it runs great at any rpm/speed. Idles fine...no problems when warm. This morning on the way to my first job, I let it run with choke for about a minute then rode off. At my first stop it died, even with enrichner on. It was difficult to get it restarted and I had to blip the throttle at the first 3 lights I came to. I find it difficult to set the enrichner properly for use until it will idle without it. After about 5 solid minutes of riding, it finally ran/idled fine. No problems with warm starts afterwards either. What are the possibilities here? It is certainly temperature related.....never hesitates or acts strange after a good 5 min of riding. Motor also sounds normal. Ideas?? Thanks a bunch for any input!

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September 17th, 2010, 08:55 AM	#2
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	Do a valve job and see if the problem goes away.

September 17th, 2010, 12:27 PM	#4
bob706 ninjette.org certified postwhore Name: Sean Location: Mary Esther, FL Join Date: Jan 2009 Motorcycle(s): 2008 Ninja 250 1998 HD Road King Posts: A lot.	+1 for valve adjustment. Have you checked the fuel filter?

September 29th, 2010, 10:04 AM	#5
JCCJMM_ ninjette.org member Name: John-Michael Location: Texas Join Date: Aug 2008 Motorcycle(s): 2007 EX250 Posts: 133	*UPDATE* Worked on the valves Monday night. 2 exhaust valve clearances (same cylinder) were too tight. Also, electrodes on plugs were worn. Seemed odd for only 12,000 miles...plugs were clean though. Adjusted 2 valves, popped in new plugs, changed oil/filter, cleaned air filter and she is riding like new again. My only question is, was it the valve lash or the plugs that caused the problem??? Thanks again guys.

September 29th, 2010, 11:59 AM	#6
kkim Join Date: Nov 2008 Posts: Too much.	what plugs are you using/was in there?

September 30th, 2010, 07:39 AM	#7
JCCJMM_ ninjette.org member Name: John-Michael Location: Texas Join Date: Aug 2008 Motorcycle(s): 2007 EX250 Posts: 133	Old plugs were factory installed, new ones are same brand/model. In addition to the worn electrodes, the old ones had too wide of a gap too. On another note, my bike is running better than it ever has! I am beginning to wonder if I mis-adjusted the 2 exhaust valves the last time I worked on them. I just never thought that 2 exhaust valves being a bit too tight would cause the bike to run as poorly as it was.