2007 kx 85 died and won,t start

tractorman38 · 05-15-2008

my son was driving the 07 kx 85 and he said it was like it ran out of gas checked gas good check compression good put new plug in no go still pulled line off tank lots of gas if i hold it full bore and kick it i get and odd puff only 15 hours on it and ideas lots of spark tried 4 plugs

chase114 · 05-16-2008

Sounds like he stuck the rings, are you sure the compression is good? Pull the exhaust and check out the piston & rings.

tractorman38 · 05-16-2008

Quote:

Originally Posted by chase114

Sounds like he stuck the rings, are you sure the compression is good? Pull the exhaust and check out the piston & rings.

compression was 115 mechanic said should be 120 so looks good

2stroke173 · 05-16-2008

115 is not good compression...i believe the usable range is 120-180 psi! When you checked it did you hold the throttle full open and kick until the indicator will no longer go up?

jandb917 · 05-16-2008

i would check the compression again then I would look at the flywheel and make sure the nut diddnt loosen off and the flywheel spun on the crank making the timing off ( we seem to be having a rash of that happining latley )

griffbones · 05-16-2008

Quote:

Originally Posted by tractorman38

compression was 115 mechanic said should be 120 so looks good

Even 120 is way low! It should start with anything over 100psi, but a good KX85 will have at least 155psi or higher! Most of my little Kawi's have run 160 -170psi

tractorman38 · 05-16-2008

Quote:

Originally Posted by griffbones

Even 120 is way low! It should start with anything over 100psi, but a good KX85 will have at least 155psi or higher! Most of my little Kawi's have run 160 -170psi

i held it full and kicked it compression was 125 checked spark and it has a nice blue constant spark could it be flooding

2stroke173 · 05-16-2008

Quote:

Originally Posted by chase114

Sounds like he stuck the rings, are you sure the compression is good? Pull the exhaust and check out the piston & rings.

I would take this guy's advice Pull the exhaust and check out the piston & rings. You should go ahead and take the reed cage out and look at the piston, cylinder, crank from the intake side too.

Something has gone wrong and you'll need to take the cylinder off and check it out 125 psi isn't good compression...

tractorman38 · 05-16-2008

yeah but 125 should start the bike

2stroke173 · 05-16-2008

Not if the cylinder's damaged...an 07' with 15 hrs and 125 psi somethings wrong and at this point to me you have no choice but to take the cylinder off to inspect the piston, rings, cylinder, crank. Not trying to start the bike to ride it!

tractorman38 · 05-16-2008

i will take it and have it check out i will keep you posted

sesker15 · 05-23-2008

i am having the same problem. When u find out what it is please let me know!!

420longshot · 05-23-2008

i would take the airbox boot off open the throttle up and squirt some fuel in the carb

tractorman38 · 05-25-2008

Quote:

Originally Posted by sesker15

i am having the same problem. When u find out what it is please let me know!!

well the top end was screwed i think my son didn't let it warm up enough 700 dollars needed a new cylinder scored thanks to everyone for the help

stevied645 · 05-26-2008

can it not be replated???

tractorman38 · 05-26-2008

it could be replated but got a new one at the track for 400 replating was 380 so i went new

griffbones · 05-27-2008

Quote:

Originally Posted by tractorman38

it could be replated but got a new one at the track for 400 replating was 380 so i went new

US Chrome charges 179.00 plus shipping and they do really nice work too! Either way, glad to hear that you got it going again.

05-15-2008	#1 (permalink)
tractorman38 Newbie Join Date: May 2008 Posts: 7	2007 kx 85 died and won,t start my son was driving the 07 kx 85 and he said it was like it ran out of gas checked gas good check compression good put new plug in no go still pulled line off tank lots of gas if i hold it full bore and kick it i get and odd puff only 15 hours on it and ideas lots of spark tried 4 plugs

05-16-2008	#2 (permalink)
chase114 Still On The Kickstand BTK Beginner Join Date: Jun 2007 Posts: 42	Sounds like he stuck the rings, are you sure the compression is good? Pull the exhaust and check out the piston & rings. __________________ http://sponsorhouse.loopd.com/Members/cconis/Home.aspx Wiseco SixSixOne Tag Metals Amsoil

05-16-2008	#5 (permalink)
jandb917 pre mix for blood BTK Intermediate Join Date: Jul 2007 Location: kansas Posts: 150	i would check the compression again then I would look at the flywheel and make sure the nut diddnt loosen off and the flywheel spun on the crank making the timing off ( we seem to be having a rash of that happining latley ) __________________ You better watch out ....." IM COMMIN AT YOU LIKE A SPIDER MONKEY "

05-26-2008	#15 (permalink)
stevied645 Wants better weather! BTK Expert Join Date: Nov 2007 Location: Scotland Posts: 705	can it not be replated??? __________________ 1996 KX250 - Renthal FatBars - Boyesen Dual Stage Reeds - FMF Fatty Pipe - DEP Silencer - Excel Rims

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05-16-2008	#4 (permalink)
2stroke173 Bridal Boutique Manager BTK Expert Join Date: Mar 2007 Posts: 346	115 is not good compression...i believe the usable range is 120-180 psi! When you checked it did you hold the throttle full open and kick until the indicator will no longer go up?

05-16-2008	#9 (permalink)
tractorman38 Newbie Join Date: May 2008 Posts: 7	yeah but 125 should start the bike

05-16-2008	#10 (permalink)
2stroke173 Bridal Boutique Manager BTK Expert Join Date: Mar 2007 Posts: 346	Not if the cylinder's damaged...an 07' with 15 hrs and 125 psi somethings wrong and at this point to me you have no choice but to take the cylinder off to inspect the piston, rings, cylinder, crank. Not trying to start the bike to ride it!

05-16-2008	#11 (permalink)
tractorman38 Newbie Join Date: May 2008 Posts: 7	i will take it and have it check out i will keep you posted

05-23-2008	#12 (permalink)
sesker15 Newbie Join Date: May 2008 Posts: 16	i am having the same problem. When u find out what it is please let me know!!

05-23-2008	#13 (permalink)
420longshot Finally Got Into First Gear BTK Beginner Join Date: May 2008 Posts: 73	i would take the airbox boot off open the throttle up and squirt some fuel in the carb

05-26-2008	#16 (permalink)
tractorman38 Newbie Join Date: May 2008 Posts: 7	it could be replated but got a new one at the track for 400 replating was 380 so i went new

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