Added reply in a thread Seized oil filler cap 2/24/2021 3:50 PM

If the standard heat/ penetrating oil methods aren’t working try taking a torx bit or a triple square that will catch the rounded hole on a hand impact driver and give that a couple taps while turning... if that doesn’t work I’d pull the side cover and ... more »

Added reply in a thread Testing ignition pulse output- KTM 250 SXF 1/31/2021 9:07 AM

Like I mentioned above you need to measure actual peak voltage coming from the stator... a low reading could indicated a bad stator, or a rotor/ flywheel that’s become weak (which is rare)... you can also measure output voltage from the pulse coil but ... more »

Added reply in a thread Testing ignition pulse output- KTM 250 SXF 1/31/2021 7:07 AM

You need to measure peak voltage coming from the stator... they sell adapters as most digital multimeters measure the RMS of an AC signal... If you’re semi electrically savvy you can make your own adapter fairly cheap... As far as the pulse/pickup coil ... more »

Added reply in a thread Fresh build, initial start OK, now nothing. *PICS UPDATE* 1/30/2021 6:18 AM

That doesn’t look like typical break in marks to me... that looks like foreign material or a partial seizure...

Added reply in a thread Best way to clean a cylinder head 1/28/2021 5:33 PM

I’ll second the ultrasonic cleaner... have one absolutely love it... it makes cleaning the carbon off combustion chambers and valves super easy...

Added reply in a thread Broken off bolt techniques 1/28/2021 10:14 AM

Vice grips... sometimes you can catch the edge with a sharp chisel and a hammer and tap it out... if all else fails left handed drill bit and an easy out...

Added reply in a thread High Compression Piston 1/22/2021 1:58 PM

Depends how much of a compression change... a timing or fuel mixture change may be necessary to prevent detonation...

Added reply in a thread 2014 YZF 450 Bogging/Stalling/Cutting out fault 1/20/2021 3:17 PM

If it’s mechanically sound I’d Make sure the injector is clean and the fuel pump is operating at the correct pressure (sounds like a possible fuel pump failure to me or plugged pickup screen/filter)... If they are then it’s possibly a Dirty intake air ... more »

Added reply in a thread What's in your track day tool box? 1/20/2021 10:04 AM

JIS screwdrivers are an absolute must if you work on motorcycles! Or any Japanese product for that matter... Buy a set... you will no longer have to worry about rounding screw heads on float bowls, reservoir caps, side covers etc... The Phillips and

... more »
Added reply in a thread Rmz250 fi 2010 1/12/2021 4:36 PM

If everything mechanically checks out I’d see if the ECM has any stored codes the procedure is outlined here...in my experience about 85-90% of hot starting issues are attributed to valve sealing or valve clearance

... more »
Added reply in a thread Yz250f valve question 1/10/2021 5:59 PM

Based off the use of hotcam shims and the shim thickness it would be safe to say it’s been shimmed prior and It’s very possible whoever shimmed the valves prior may have shimmed them incorrectly... You have plenty of room left to shim them and bring ... more »

Added reply in a thread Yz250f valve question 1/9/2021 6:20 PM

You need to pull the buckets and check the actual shim size not just the clearance.

Added reply in a thread Yz250f valve question 1/9/2021 5:20 AM

How thin are your shims?

Added reply in a thread Yz250f valve question 1/8/2021 7:37 PM

Yes, valves tend to tighten over time as the seat and valve wear... On many of the bikes I’ve seen the intake valves tend to lose clearance faster than the exhaust, but this is more than likely caused by poor air filter maintenance...

Added reply in a thread Yz250f valve question 1/8/2021 7:21 PM

All the way with a minuscule amount of drag...

Added reply in a thread CR 125 New sleeve but potential piston slap ? 1/8/2021 9:49 AM

This makes more sense I was wondering how a piston that far off even ran... .25mm or .0098” is still too loose!

Added reply in a thread CR 125 New sleeve but potential piston slap ? 1/5/2021 7:27 AM

you’re correct quick math gone wrong... let me correct that...

Added reply in a thread Header heat treating 1/4/2021 7:49 AM

I believe they’re stainless and stainless will “blue” no problem with a little bit of heat from a small map torch... or even an oxy acetylene...

Added reply in a thread Best website for OEM parts? 1/4/2021 7:45 AM

🤙

Added reply in a thread 00 CR250 just bought blown up . please help 1/3/2021 5:36 PM

More expensive/better options: replace the cases or have it machined to accept a slightly larger O.D. Bearing... cheaper options (if you’re trying to save money) Bearing retaining compound or stake/ knurl the bearing bore...