Added reply in a thread YZ 125 custom engine mods 4/1/2020 7:09 AM

Odd that you have no bottom end power after all you did. I have always found the Keihin to make more torque than the Mikuni. With putty in the intake, it should make a little more torque. a 45 pilot sounds a little lean on a 125 but just a guess. Interesting ... more »

Added reply in a thread 2017 CRF450R vs 2019 KTM 350 SXF 3/31/2020 2:00 PM

I can think of two brands that are "roached" at 35 hrs and they aren't orange or white. These two brands feature fasteners made from coat hanger metal and strip easily. Haha

Added reply in a thread Can i use this as transmission oil? 3/31/2020 12:20 PM

That's good oil and you can mix in a smoker transmission no problem.

Added reply in a thread Power valve oil issue?? 3/30/2020 7:28 PM

Normal. Just clean and inspect everything per the manual. The HPP powervalve system is pretty complex to service and rebuild but not too bad if you follow the steps.

Added reply in a thread 2001 CR250 Help!!!! 3/28/2020 5:11 PM

The powervalve drum on the left side (under the cap on left hand side) should rotate 90 degrees from full closed to full open. There is an "L" and "H" mark on the side of the cylinder. Is your PV not opening or not closing completely?

Added reply in a thread Dumb Carb question 3/27/2020 3:36 PM

The idle circuit on those carbs was set by turning the choke know counterclockwise to increase the idle and clockwise to decrease idle speed. I believe the stock setting is between 18-25 clicks out from fully seated but don't quote me. The trick on those ... more »

Added reply in a thread YZ125 No Impeller? 3/27/2020 3:30 PM

I ran an '01 RM 250 with a plastic impeller that melted off and debonded. The cooling system was basically functioning as a convection cooling system. Haha. I kept wondering why she got hot and puked coolant with no change to jetting or compression. ... more »

Added reply in a thread YZ125 No Impeller? 3/27/2020 1:28 PM

Either someone didn't put the impeller back in or it broke off and degraded. Either way, you need an impeller.

Added reply in a thread That talking wallet thing 3/25/2020 9:22 AM

Damn it! that was my second guess (last gen 125). Awesome bike!

Added reply in a thread That talking wallet thing 3/25/2020 8:01 AM

Newmann!!! Could it be a super low hour '02 CR250?????

Added reply in a thread Good gearing for woods riding on a 350sxf? 3/25/2020 7:04 AM

I'd think 14/51 or 14/52 would be a good starting point. You'll be in 1st a few time and have to pass over neutral which isn't ideal, but 2/3rd will a bit more normal.

Added reply in a thread Piston to cylinder clearance issues 3/21/2020 9:02 AM

I put a vertex "B" piston in a an '02 CR250 "B" cylinder and man, it felt tight. I measured everything and found the piston to be about .0005" larger than the measurement as well. It almost bound up in the cylinder as I test fit it in the cylinder (without) ... more »

Added reply in a thread Yz250 5th gear neutral 3/17/2020 9:07 PM

When I bench shift a YZ 250 motor, I put shift star drum on (make sure the locating pin is alligmed with the groove in the shift star and torque to spec (22ft-lbs) and I do not put the detent spring and arm on yet so I can feel the shiftforks move. You ... more »

Added reply in a thread Yz 125 do I need race fuel? 3/17/2020 7:33 AM

run at least 50:50 race fuel at 10.8cc volume. Look for any signs of detonation and bump up % of race fuel if necessary. Race fuel is expensive but so is melting down a perfectly good top end.

Added reply in a thread 2001 CR250 Help!!!! 3/16/2020 6:50 AM

the powervalve has a massive effect on jetting. It goes with out saying that once you get the PV fully operational, the jetting will change.

Added reply in a thread KTM SXF 250 2020 Bar Bend 3/15/2020 8:45 PM

I have not tested the Fat Bar but most feedback I've seen is that the PT EVO has the most flex/compliance.

Added reply in a thread Fc 450 Cam and rocker arm wear? 3/15/2020 8:43 PM

Your going to need to replace the seat. I would do the intakes as a pair and get new valves. Ouch.

Added reply in a thread KTM SXF 250 2020 Bar Bend 3/15/2020 8:41 PM

Pro Taper Evo "Stock Husqvarna" bend is very close. I measured them against the stock Neken bars on my 350 and they were almost identical.

Added reply in a thread Fc 450 Cam and rocker arm wear? 3/14/2020 5:52 PM

Sweet Jesus! That rocker arm and cam are toasty! My only suspicion would be: -clogged cam/rocker oil jet and lack of lube -overly tight intake valves which basically means the rocker arm was riding on the entire cam lobe and never getting a chance to ... more »

Added reply in a thread Yz250 5th gear neutral 3/14/2020 5:44 PM

I would just insert all shift forks into the case and make sure they all slide freely in both sides of the cases. I wouldn't do anything until you have an issue and the pin won't go into the bosses. My center shift fork got stuck to the left (4th gear) ... more »