Posts
63
Joined
2/5/2023
Location
USA
Was planning on one more cold snap here in NC before I did a complete overhaul on my tc. Unfortunately I broke some ribs at a local indoor ax track, so I'll be starting a little early. Here's what we're starting with.
Got it stripped to the frame and cases split.
Not planning on doing anything crazy, as I want to keep it reliable. Currently have a Keihin 38 carb with v force reeds, and a pro circuit 304 muffler.
Very similar to what i did last year ,
go with a 300cc Kit ,Full FMF, Vforce 4 and Powdercoat the Frame in black
This year i Upgrade to a Keihin PWK 38
what you are planing for the Frame Colour ?
Dang, that looks good!!
I'm going to do black frame, and I think gray plastics.
What pegs are you running?
I run that Apico Pegs
How do you like the Keihin compared to the Mikuni?
installed the Keihin few weeks ago but had Not the Chance to ride it
The Shop
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Ten times better. But I also didn't take the time to do all the mods to the mikuni. I could never get the pilot jet perfect on the original carb.
Got a little more done this weekend. Cleaned the swingarm and replaced all the bearings.
Also got the expansion chamber cleaned up.
Tried almost every mod on the Mikuni and re-jet up and down never get it Right
the old Keihin on my 30 year Old Vintage KTM runs way better than the Mikuni ever did , cant wait to test the PWK on the TC 300
OP
what are you running for jetting in the keihin?
I'm NECJ 40 pilot and 172 main
only ripped down the road but fear I’m lean....
For the First startup it was way to lean OEM jetting was 155 Main
now i tried a 170 Main ride it up and down the Road still feels to lean , but i‘m waiting on warmer Wheater for set the Carb
I'll check tomorrow evening and get back to you on it. I got the carb from JD jet so it came with multiple options.
Finished putting the graphics on last night.
Also got the new seat cover on, and received the new quick turn throttle in the mail.
Hopefully the throttle helps me get out of the turns a little quicker. The 450s are eating me up on exits.
I'm running the NECJ at third position, 42 pilot and 175 main. I'm at about five hundred feet.
Started reassembling the bottom end, but still waiting on the case gasket. Should also be picking up the crane this weekend from the powder coater.
How many hours on the crank before rebuild? Was it still in spec, or did you rebuild or replace it? How was the trans gears? Much wear?
I’m considering picking up a 110 hour 21tc250, and wondering how the lower end holds up? Thanks!
The bike had forty hours on it, all stock. Everything was in perfect order and in spec. I rebuilt the crank and inspected all the gears and couldn't find anything worn or damaged. I only rebuilt the crank for preventative reasons.
I think if the guy your getting the bike from is a good smooth rider, and he takes care of his stuff, bike should be good.
If he uses the vented air box cover, I'd pull the air filter and check the boot/carb for dirt and or water. I had to go back to running grease around my air filter. That cover let's allot more shit in than you'd think.
Picked the frame up last night. Looking way better than that navy blue they are using.
Also got the pegs back from Metaltek. The owner is really cool and had fast turn around.
One thing I did have a problem with was the shifting forks. The part number on each fork does not match the number online. Trying to figure out which one went where on the counter shaft was a nightmare. It was hours of trial and error to get it correct.
Also learned the hard way on ultrasonic cleaning a carb. KEEP DIFFERENT METALS OUT OF THE SAME CLEANING BATCH. Ended up tarnishing the carb body, and took twice as long as should've recleaning everything.
Making progress!
What did the metaltek pegs run you?
Pit Row
$150
First Ride yesterday startet with 175# Main and 42 Pilot Jet at 15 degrees (59F) but was a little lean on Long uphill .
Go up to 185# Main and runs Great best Mod i did. the last years the Keihin Conversion on the Husquarna
What needle?
thanks!
Got her all finished up!
Then catastrophy!
Seized it going down the first straight away. Bike was warmed up, and seemed to be running good on break in.
Wore the piston on both sides like this towards exhaust. It also wore a little at the ring gap. I'm sure it's something stupid I did, but can't seem to figure it out.
Total bummer, I love my TC and I'm gutted for you.
Check this out, might help with diagnosis.
https://www.twostroketuning.com/two-stroke-piston-troubleshooting/
Thanks for that info! Looks like an air leak seize. It's gotta be from one of the seals in the bottom end. Also ring gap could've also been part of it.
Did you check ring gap?
No, like a true idiot I got impatient and was trying to get it ready for the weekend. I think the wear at the ring gap was secondary. The damage towards the exhaust port was much more substantial.
What's would you guys do?
Prices are so much higher now to get the cylinder replated, plus all the parts. I can almost save money and get a 300 kit.
Go with the 300cc Kit it’s not that much stronger than the 250 but much easier to ride.
Think it’s about 1000$ for the complete 300 Kit
Did you already found the cause of the Damage?
Have you Check the Piston to Cylinder clearance , think should be almost the same like on the 300 with 0,06mm
I haven't found the definitive answer but I know I missed the o ring that goes between the right side main bearing and the seal. The bike did seem to be smoking more of a lighter color on break in. Which I've recently learned could be blown head gasket or burning transmission oil. The wear marks on the piston make me think the later, as well as the missing o ring.
I checked the distance on initial rebuild. Everything was good there.
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