question about mix ratios for kx 125

brikx125 · 10-14-2008, 05:45 PM

This is my first 2 stroke dirt bike, it is a kx 125 bored to a 155 does any body have tips on mix ratios for this bike.

tigmaster · 10-14-2008, 05:49 PM

What was it ran at before? Has it just been bored? How was the job done? Steel sleeve or sleeve pulled and Nikasil coated?

My general suggestion would be a 40:1 mix with a synthetic oil such as Bel-Ray. But without knowing the questions above, I would also suggest a re-jet.
http://www.mototips.com/how-articles...your-ride.html

brikx125 · 10-14-2008, 06:04 PM

Not shure what it was ratio was be for. Previous owner just had the engine work done I believe its a steel sleeve

wr250f95 · 10-14-2008, 06:17 PM

well, Im going to disagree with tigmaster, run 32:1 with a synthetic, most bike builders recommend this from the factory.
also, Im going to move this to the kawi 2t section

tigmaster · 10-14-2008, 07:38 PM

Ran 40:1 with Yamalube mineral oil for 25 hours with no issues what so ever. Compression was still almost 100% Almost every shop will suggest 50:1 or 40:1. Bel-Ray suggests 50:1 right on their bottles. Girlfriend runs 50:1 in her YZ300 with no issues and that was a sketch bore for sure.

gscx · 10-15-2008, 01:38 PM

is it bored and stroked?

10-14-2008, 05:45 PM	#1 (permalink)
brikx125 C Rider Join Date: Oct 2008 Posts: 2	question about mix ratios for kx 125 This is my first 2 stroke dirt bike, it is a kx 125 bored to a 155 does any body have tips on mix ratios for this bike.

10-14-2008, 05:49 PM	#2 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,492	What was it ran at before? Has it just been bored? How was the job done? Steel sleeve or sleeve pulled and Nikasil coated? My general suggestion would be a 40:1 mix with a synthetic oil such as Bel-Ray. But without knowing the questions above, I would also suggest a re-jet. http://www.mototips.com/how-articles...your-ride.html __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

10-14-2008, 06:17 PM	#4 (permalink)
wr250f95 Super Moderator Join Date: May 2007 Location: New Mexico Posts: 7,657	well, Im going to disagree with tigmaster, run 32:1 with a synthetic, most bike builders recommend this from the factory. also, Im going to move this to the kawi 2t section __________________ "LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!" this, is why I ride.

10-14-2008, 07:38 PM	#5 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,492	Ran 40:1 with Yamalube mineral oil for 25 hours with no issues what so ever. Compression was still almost 100% Almost every shop will suggest 50:1 or 40:1. Bel-Ray suggests 50:1 right on their bottles. Girlfriend runs 50:1 in her YZ300 with no issues and that was a sketch bore for sure. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

10-15-2008, 01:38 PM	#6 (permalink)
gscx Pro Mototips Member Join Date: Aug 2007 Location: bridgeville DE Posts: 2,199	is it bored and stroked? __________________ Sold

10-14-2008, 06:04 PM	#3 (permalink)
brikx125 C Rider Join Date: Oct 2008 Posts: 2	Not shure what it was ratio was be for. Previous owner just had the engine work done I believe its a steel sleeve

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