Home

 

Forum

 

Honda

 

	1994 cr250r with 250lbs of compression started by bikefrk24
	June 17th 2009 at 5:30 PM Post #1
	bikefrk24 Starting Member 1 Posts Group: Members Member Since: June 17th 2009
	I have a 1994 cr250r that I just rebuilt and i tried to start it but it was hard to kick so I checked the compression and it has 250lbs of compression. I put a hot rod crank and weisco piston in it I had the cylinder honed and there was .003" between the piston and cylinder. I am trying to figure out why it has so much compression. I am a motorcycle mechanic and have checked the the obvious things but I am also new to the two stroke world so any input would be nice. I was told by a friend that is into two strokes more than me that it was way to high and I can damage my motor if I run it. Rating: 0 Quick Edit Edit Topic
	June 19th 2009 at 12:04 PM  [ Modified June 19th 2009 at 12:05 PM ] Post #2
	MX86 Resident Asshole 565 Posts Group: Moderators Member Since: June 5th 2008 Location: Nashwauk, MN, USA Current Dirtbike: 2006 Yamaha yz250 Race Number: 86 Sponsors: X-Brand, Gravity Worx
	Pick up some 110 Race fuel and run that straight for the first tank. the 2 stroke dirtbikes are known to run a ton of compression. I have a 06 with stock head straight from yamaha running 247 PSI on 3 compression guages, it's nothing new and i'm running 91 pump gas. dunno what it is that makes them run such high compression and not ping, but good design by the companies. also keep in mind that you have a new motor, things are going to be tight until you break it in and get some hours on it. run it on the stand for a few min just idling and then re-check the bolts, let it cool down slightly and check the compression again. Living Life 1 berm at a time. Rating: +1 Quick Edit Full Edit