No bottom end KX 250

duckunter · 08-02-2009

My 2000 KX 250 has no power on the bottom end. I know a two stroke will not have the bottom end power that a four stroke will have but my son's 2001 YZ 250 has much more pull from the very bottom than my KX. He can start in 2nd gear, I am LUCKY to start in 1st gear. Last March (2009) I put a new piston/rings with new Boysen reeds in. The cylinder had a heavy wear ring in it but was not worn through the cylinder coating. (ie cylinder was/is about worn out) Is my no bottom end because I need to redo my cylinder or is it the Boysen reeds wear out real quick? Any advise will be appreciated! (And don't tell me to buy a four stroke

)

lvlasked · 08-03-2009

could well be your cylinder as it you tryed a compression test ?

KAWASAKI_125 · 08-03-2009

Check your reed's and make sure thay are flush, make sure that your carb is properly jetted and clean.

^Tonka · 08-03-2009

Try compresssion test to make sure you have no leaks.
Boysen reeds dont wear out too quickly.
If cylinder is/was worn then it will need to be recoated/sleeved.

nd4speed · 08-03-2009

compression, advanced timing, jetting, and properly adjusted power valves will add to low end. Pipe, size of carb, and porting can add too.

duckunter · 08-10-2009

Thanks for the input. My manual says it should be BTDC (beyond top dead center) when I pulled the side cover off it was sent in front of TDC, which really supprised me! Still need to check compression.

08-02-2009	#1 (permalink)
duckunter Newbie Join Date: Mar 2008 Posts: 13	No bottom end KX 250 My 2000 KX 250 has no power on the bottom end. I know a two stroke will not have the bottom end power that a four stroke will have but my son's 2001 YZ 250 has much more pull from the very bottom than my KX. He can start in 2nd gear, I am LUCKY to start in 1st gear. Last March (2009) I put a new piston/rings with new Boysen reeds in. The cylinder had a heavy wear ring in it but was not worn through the cylinder coating. (ie cylinder was/is about worn out) Is my no bottom end because I need to redo my cylinder or is it the Boysen reeds wear out real quick? Any advise will be appreciated! (And don't tell me to buy a four stroke )

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08-03-2009	#2 (permalink)
lvlasked Still On The Kickstand Join Date: Jul 2009 Posts: 28	could well be your cylinder as it you tryed a compression test ?

08-03-2009	#3 (permalink)
KAWASAKI_125 Newbie Join Date: Aug 2009 Location: South Africa Posts: 21	Check your reed's and make sure thay are flush, make sure that your carb is properly jetted and clean.

08-03-2009	#4 (permalink)
^Tonka Dirt Bike Dad Join Date: Apr 2009 Location: outback australia Posts: 25	Try compresssion test to make sure you have no leaks. Boysen reeds dont wear out too quickly. If cylinder is/was worn then it will need to be recoated/sleeved.

08-03-2009	#5 (permalink)
nd4speed Can't find time to ride BTK Expert Join Date: Dec 2008 Location: MI Posts: 561	compression, advanced timing, jetting, and properly adjusted power valves will add to low end. Pipe, size of carb, and porting can add too.

08-10-2009	#6 (permalink)
duckunter Newbie Join Date: Mar 2008 Posts: 13	Thanks for the input. My manual says it should be BTDC (beyond top dead center) when I pulled the side cover off it was sent in front of TDC, which really supprised me! Still need to check compression.

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