Added reply in a thread Backfire issue 8/13/2020 11:30 PM

Backfire on decel is normally caused by a lean condition... If there are no air leaks or exhaust leaks and the valves are in good condition ... I would suggest you step the pilot up one size and then re-adjust your fuel mixture screw... If the problem ... more »

Added reply in a thread crf250r hard to kick over after rebuild 8/11/2020 12:26 AM

The orientation of the lobes looks correct... How does it turn over with the head off?

Added reply in a thread crf250r hard to kick over after rebuild 8/10/2020 4:48 PM

Some camshafts have holes in the cam gear that align with corresponding holes in the cam lobes... I believe your cam gear unfortunately does not... The most accurate way to check if the gear has spun would be to degree your camshaft... the easier way ... more »

Added reply in a thread crf250r hard to kick over after rebuild 8/8/2020 8:13 PM

.009” on the exhaust is fine, if not better, than the factory spec of .011”... the fact that you’ve stated it’s starting to turn over easier is an indication to me that something’s incorrect internally (could be something as simple as an incorrectly ... more »

Added reply in a thread 96 cr250 major air leak please advise 7/30/2020 11:24 AM

I would suggest Looking Into a possible leak at the base gasket...

Added reply in a thread 2019 CRF250R Wont Stay Running. 1 Mil Blink 7/29/2020 5:26 PM

New problem sounds more like excessive blow by or crankcase pressure... (the oil you’re seeing is more than likely coming from the breather tube that routes directly to the inlet side of the air box)... It could be as simple as over filling the engine ... more »

Added reply in a thread 99-2002 kx125 parts 7/25/2020 11:54 PM

I have one but I can almost guarantee you there’s a bunch of them on eBay for

Added reply in a thread Piston kx125 7/18/2020 3:47 PM

Measure the bore to make sure it’s still in spec... Then choose a piston based upon your results and recommended piston to wall clearance... By theory it should be a C but that’s not always the case...

Added reply in a thread 2016 yz250f won’t stay running 7/14/2020 12:06 PM

He’s more than likely referring to this tool which just allows you to clean/flush the injector... the only other way I could see a shop cleaning a throttle body is to disassemble it and put it in an ultrasonic

Added reply in a thread Timing conundrum 7/12/2020 6:38 PM

You need a degree wheel and a dial indicator... there’s plenty of articles available on how to degree a camshaft properly... its a great piece of information to learn for anyone building engine... It not only verifies that the cam profile is correct ... more »

Added reply in a thread Timing conundrum 7/12/2020 5:49 PM

what was the reason for rebuild/ teardown? It almost looks as if one of the cam gears have spun slightly notice the cam gear teeth are slightly out of alignment... also does the intake cam not have an alignment dot with the head surface? If all else

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Added reply in a thread 03 cr250 fresh rebuild blowing coolant out of exhaust 7/12/2020 5:10 PM

Warped/cracked head or cylinder... Damaged O-ring or warped cases where coolant passes between them. Was problem existent prior to rebuild?

Added reply in a thread Pinging after piston change. 7/2/2020 11:59 AM

As mentioned above... it would look like minor pit marks around the edge of the piston and/or combustion chamber of the head... Yz’s do tend to rattle at idle... If you’re that worried about it remove the head it’s only way to know without a doubt... ... more »

Added reply in a thread Pinging after piston change. 7/2/2020 11:45 AM

If you’re worried about it... drain the coolant and knock the head back off... 30 mins of work and you’ll have your answer to whether or not it’s detonating...

Added reply in a thread 2003 cr250 forks keep leaking 6/14/2020 3:42 PM

Is the fork tube itself straight/true?

Added reply in a thread Help! Valve gasket or Cylinder Gasket? 6/8/2020 9:41 AM

X2

Added reply in a thread Help! Valve gasket or Cylinder Gasket? 6/8/2020 9:25 AM

Definitely valve cover gasket... easiest thing to remember when chasing a leak “sh*t runs downhill” not up... please don’t use bars leak either if you ever have a small leak or blown head gasket... fix it the correct way...

Added reply in a thread How bad is it? 6/6/2020 4:08 PM

Looks like Casting flash I wouldn’t worry about it

Added reply in a thread Wiseco Clutch Replacement Kickstarter Gear Issue 6/2/2020 10:50 AM

Heat the basket back up in an oven or equivalent... gear should fall out with a light tap... then freeze the gear and heat the basket It will drop right in...

Added reply in a thread 09 kx250f problems after rebuild 6/1/2020 10:19 AM

When I ran into the problem... sometimes the bike would start, sometimes it would just pop and never start... I found it when I got the bike to fire again... I just sat there moving the wiring harness/connectors around until it stalled...