98 KX starting problem

used98KX · 02-20-2005

I need some advice, i'm not much a mechanic and don't know what is wrong.

Bike was behaving great for a couple of hours, i was taking it way too easy though due to riding with my kids on their atv. 100 yards from the truck we stopped for a second to talk, the bike died and wouldn't restart. This has happened before because of my slow riding and i fixed it by taking the cylinder head off and cleaning the gunky oil out of the valve so it would move freely. Doing that again did not fix this problem. I put in a new plug and took the carb out and sprayed it clean, after a bit the bike started then died again, i got it restarted later and it ran fine except for when i let off the gas then it died and took 5 mins to get it restarted, then it ran fine until i came to a stop again and the bike died and now won't restart.

I kick and kick and all that happens is it periodically (for lack of a better description) farts out the exhaust. It seems to me like i have some sort of carb issue but i have no idea how they actually work lol, I do have a diagram of the carb so i'll know what you're talking about if you can describe some things to try. Any help would be appreciated.

btw, this is a 125cc

scottc1088 · 02-21-2005

did you clean all the jets in the carb?

used98KX · 02-21-2005

I sprayed it/them with carb cleaner the best i could without actually taking the carb apart.

scottc1088 · 02-21-2005

i would strip it down completely and clean it
also is the spark and compression?

**2WheelFun** · 02-21-2005

Possibly an electrical problem?

QKENUF4U · 02-21-2005

being two stroke have the compression checked. sounds like the top end is gone.
also like stated above, might be worth your time to pull the carb down and clean the jets/internals. also make sure the air filter is clean, make sure the exhaust isnt plugged up somehow, make sure you have spark

used98KX · 02-21-2005

Will do

used98KX · 02-22-2005

I ordered a top end rebuild kit today, we'll see how that does

used98KX · 02-28-2005

Rebuilt the top end today. It's running great. Thanks for the advice!

used98KX · 03-01-2005

She's still running good, starts on first kick, idles properly. I'm ecstatic

02-20-2005	#1 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	98 KX starting problem I need some advice, i'm not much a mechanic and don't know what is wrong. Bike was behaving great for a couple of hours, i was taking it way too easy though due to riding with my kids on their atv. 100 yards from the truck we stopped for a second to talk, the bike died and wouldn't restart. This has happened before because of my slow riding and i fixed it by taking the cylinder head off and cleaning the gunky oil out of the valve so it would move freely. Doing that again did not fix this problem. I put in a new plug and took the carb out and sprayed it clean, after a bit the bike started then died again, i got it restarted later and it ran fine except for when i let off the gas then it died and took 5 mins to get it restarted, then it ran fine until i came to a stop again and the bike died and now won't restart. I kick and kick and all that happens is it periodically (for lack of a better description) farts out the exhaust. It seems to me like i have some sort of carb issue but i have no idea how they actually work lol, I do have a diagram of the carb so i'll know what you're talking about if you can describe some things to try. Any help would be appreciated. btw, this is a 125cc Last edited by used98KX : 02-20-2005 at 04:55 PM.

02-21-2005	#5 (permalink)
2WheelFun the "fun old" guy Extreme Forum Supporter Join Date: Nov 2004 Location: Albion, Washington "Pacific Northwest" Posts: 30,362	Possibly an electrical problem? __________________ *KING KAHUNA* *2007 V2K LT* ****PICS** 2007 Brute Force 650i **PICS** I love the smell of SeaFoam in the morning**

02-21-2005	#2 (permalink)
scottc1088 Still On The Kickstand Join Date: Jan 2005 Posts: 26	did you clean all the jets in the carb?

02-21-2005	#3 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	I sprayed it/them with carb cleaner the best i could without actually taking the carb apart.

02-21-2005	#4 (permalink)
scottc1088 Still On The Kickstand Join Date: Jan 2005 Posts: 26	i would strip it down completely and clean it also is the spark and compression?

02-21-2005	#6 (permalink)
QKENUF4U AZ's Official Mechanic BTK Expert Join Date: Sep 2004 Location: phoenix arizona Posts: 3,646	being two stroke have the compression checked. sounds like the top end is gone. also like stated above, might be worth your time to pull the carb down and clean the jets/internals. also make sure the air filter is clean, make sure the exhaust isnt plugged up somehow, make sure you have spark

02-21-2005	#7 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	Will do

02-22-2005	#8 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	I ordered a top end rebuild kit today, we'll see how that does

02-28-2005	#9 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	Rebuilt the top end today. It's running great. Thanks for the advice!

03-01-2005	#10 (permalink)
used98KX Finally Got Into First Gear BTK Beginner Join Date: Sep 2004 Location: South FL Posts: 54	She's still running good, starts on first kick, idles properly. I'm ecstatic

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