Valve issue

SpYd3r05 · July 14th, 2010, 08:56 PM

I got to my bike yesterday would not start even tho it was getting gas air and spark... so i pull apart my valve cover.... Sure enough one of the pistons intake valves were way to small a gap (ie could not get any feeler gauge in it... after attempting adjusting i can not get either one to get a gap that is correct... (.005 inch) I couldn't even get it to 0.3... any ideas?
I attempted searching couldn't find anything related...

nate-bama · July 14th, 2010, 10:08 PM

///?

SpYd3r05 · July 14th, 2010, 10:16 PM

Basically after letting the adjustment screw all the way out (seemingly)(it does stop at a certain point right?) it would not it get loose enough for it to get in spec with a big enough gap.

kkim · July 15th, 2010, 12:30 AM

are you sure you have the cams positioned correctly?

SpYd3r05 · July 15th, 2010, 08:21 AM

I re adjusted position several times checking and double checking..

kkim · July 15th, 2010, 10:28 AM

so the cams are like in this procedure?

http://faq.ninja250.org/wiki/What_is...lve_Adjustment

SpYd3r05 · July 15th, 2010, 03:02 PM

Yea... i have done valves before it is just like the wiki

kkim · July 15th, 2010, 03:21 PM

Sorry, I've never done a valve adjustment on a pregen, but have done many on other cars and bikes... is the adjuster threaded so it should be able to back out completely or is there some sort of stop that prevents it from being adjusted fully "out" other than the lock nut?

SpYd3r05 · July 15th, 2010, 03:45 PM

it seems as if there is a stop point...

SpYd3r05 · July 16th, 2010, 11:21 PM

Update it seems as if it is at end of life possibly.... The valves can not be adjusted any further..... I play have 9000 miles on it which completely sucks

nate-bama · July 17th, 2010, 12:05 PM

leave your feeler gauge in, as you run your screw down and tighten the jam nut up, do it enough that the gauges pop out with effort(can't let that set screw turn). Now carefully hold your set screw and apply proper tourqe

SpYd3r05 · July 17th, 2010, 01:42 PM

It wont go into spec even with the locking nut still loose...

kkim · July 17th, 2010, 01:46 PM

Quote:

Originally Posted by SpYd3r05

it seems as if there is a stop point...

is this true with the other adjusters as well?

SpYd3r05 · July 17th, 2010, 01:54 PM

The only adjuster afaik is the adjustment screw.... which basically from what ive seen on diagrams is a upside down bolt with a screw head on the tail side....

kkim · July 17th, 2010, 02:06 PM

mmm... okay. sounds like you might need to replace the adjuster?

curious as to why this is happening though. 2 ways that I can think of... the adjuster is worn where it contacts the cam lobe or the valve has been pounded into the seat area of the cylinder and is sticking up farther than it is supposed to.

have you tried backing out another adjuster to see how much adjustment leeway/gap you can get with a "good" adjuster?

SpYd3r05 · July 17th, 2010, 04:02 PM

I have not swithed the adjusters. There are two intakes on the same piston that do the same thing... almost at the same distance... the other two are still perfectly set from the last adjustment...

kkim · July 17th, 2010, 06:47 PM

sorry if I wasn't clear (I seldom am... ask my wife

)

I was asking, on the other adjusters, if you back them out as far as you can, what's the max clearance with them?

SpYd3r05 · July 17th, 2010, 07:28 PM

No worries im the same way.... im not sure off hand.... it'll be monday before i can check... im having to replace water pump in the cage between twelve hour work shifts,

longhorn · August 12th, 2010, 04:27 PM

Were it the exhaust valves one could surmise that the valves/valve seats were burnt, so allowing the valve stems to rise up and consume all available adjustment space; I would have thought it unlikely that the intake valves would go first. At 9,000 miles any of the above seems very unlikely unless you run wot and way lean or someone did a previous adjustment and left far too small a gap.

July 14th, 2010, 08:56 PM	#1
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	Valve issue I got to my bike yesterday would not start even tho it was getting gas air and spark... so i pull apart my valve cover.... Sure enough one of the pistons intake valves were way to small a gap (ie could not get any feeler gauge in it... after attempting adjusting i can not get either one to get a gap that is correct... (.005 inch) I couldn't even get it to 0.3... any ideas? I attempted searching couldn't find anything related... __________________________________________________ JOIN US In the Picture Game

July 14th, 2010, 10:08 PM	#2
nate-bama North Alabama Mtn. ryder Name: Nate Location: Alabama Join Date: May 2009 Motorcycle(s): 2006 Posts: 537	///? __________________________________________________ QTRltrPWR

July 14th, 2010, 10:16 PM	#3
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	Basically after letting the adjustment screw all the way out (seemingly)(it does stop at a certain point right?) it would not it get loose enough for it to get in spec with a big enough gap. __________________________________________________ JOIN US In the Picture Game

July 15th, 2010, 08:21 AM	#5
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	I re adjusted position several times checking and double checking.. __________________________________________________ JOIN US In the Picture Game

July 15th, 2010, 03:02 PM	#7
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	Yea... i have done valves before it is just like the wiki __________________________________________________ JOIN US In the Picture Game

July 15th, 2010, 12:30 AM	#4
kkim Join Date: Nov 2008 Posts: Too much.	are you sure you have the cams positioned correctly?

July 15th, 2010, 10:28 AM	#6
kkim Join Date: Nov 2008 Posts: Too much.	so the cams are like in this procedure? http://faq.ninja250.org/wiki/What_is...lve_Adjustment

July 15th, 2010, 03:21 PM	#8
kkim Join Date: Nov 2008 Posts: Too much.	Sorry, I've never done a valve adjustment on a pregen, but have done many on other cars and bikes... is the adjuster threaded so it should be able to back out completely or is there some sort of stop that prevents it from being adjusted fully "out" other than the lock nut?

July 15th, 2010, 03:45 PM	#9
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	it seems as if there is a stop point... __________________________________________________ JOIN US In the Picture Game

July 16th, 2010, 11:21 PM	#10
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	Update it seems as if it is at end of life possibly.... The valves can not be adjusted any further..... I play have 9000 miles on it which completely sucks __________________________________________________ JOIN US In the Picture Game

July 17th, 2010, 12:05 PM	#11
nate-bama North Alabama Mtn. ryder Name: Nate Location: Alabama Join Date: May 2009 Motorcycle(s): 2006 Posts: 537	leave your feeler gauge in, as you run your screw down and tighten the jam nut up, do it enough that the gauges pop out with effort(can't let that set screw turn). Now carefully hold your set screw and apply proper tourqe __________________________________________________ QTRltrPWR

July 17th, 2010, 01:42 PM	#12
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	It wont go into spec even with the locking nut still loose... __________________________________________________ JOIN US In the Picture Game

July 17th, 2010, 01:54 PM	#14
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	The only adjuster afaik is the adjustment screw.... which basically from what ive seen on diagrams is a upside down bolt with a screw head on the tail side.... __________________________________________________ JOIN US In the Picture Game

July 17th, 2010, 02:06 PM	#15
kkim Join Date: Nov 2008 Posts: Too much.	mmm... okay. sounds like you might need to replace the adjuster? curious as to why this is happening though. 2 ways that I can think of... the adjuster is worn where it contacts the cam lobe or the valve has been pounded into the seat area of the cylinder and is sticking up farther than it is supposed to. have you tried backing out another adjuster to see how much adjustment leeway/gap you can get with a "good" adjuster?

July 17th, 2010, 04:02 PM	#16
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	I have not swithed the adjusters. There are two intakes on the same piston that do the same thing... almost at the same distance... the other two are still perfectly set from the last adjustment... __________________________________________________ JOIN US In the Picture Game

July 17th, 2010, 06:47 PM	#17
kkim Join Date: Nov 2008 Posts: Too much.	sorry if I wasn't clear (I seldom am... ask my wife ) I was asking, on the other adjusters, if you back them out as far as you can, what's the max clearance with them?

July 17th, 2010, 07:28 PM	#18
SpYd3r05 ninjette.org member Name: Matt Location: Middle GA Join Date: May 2010 Motorcycle(s): 2003 Ninja 250 Posts: 184	No worries im the same way.... im not sure off hand.... it'll be monday before i can check... im having to replace water pump in the cage between twelve hour work shifts, __________________________________________________ JOIN US In the Picture Game

August 12th, 2010, 04:27 PM	#19
longhorn ninjette.org member Name: Nick Location: Tucson Join Date: May 2010 Motorcycle(s): 2009 Ninja 250R Posts: 20	Were it the exhaust valves one could surmise that the valves/valve seats were burnt, so allowing the valve stems to rise up and consume all available adjustment space; I would have thought it unlikely that the intake valves would go first. At 9,000 miles any of the above seems very unlikely unless you run wot and way lean or someone did a previous adjustment and left far too small a gap.

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