Building my stock stroke/wildcard ported trail motor

[brandoz28]

Dialed it in today (well technically yesterday). not sure why these OKO carbs get such a bad rep for being hard to tune? I haven't checked the needle yet, but it feels awesome everywhere. Running a 168 main, 52 pilot, the air screw is about 1 turn out. I may try a 55 pilot to see if it likes that any better. still the stock needle, in the middle clip. It was low/mid 30's today. I'm thinking that I'll run about a 162 during the summer when it's warmer out.

thread with a couple pics of the bike all together after ripping it around and a couple of the plug chop.
http://www.blasterforum.com/pics-vids-9/tnt-wildcard-porting-head-mod-46071/

 

[turbowrenchhead]

I read through your posts. I'm trying to dial in my built blaster and having a hard time doing it due to inexperience with 2 strokes. I have run a 48 pilot and 160 main on a 35 pwk and its multipoint seized on me 4 times total.

 

[brandoz28]

I read through your posts. I'm trying to dial in my built blaster and having a hard time doing it due to inexperience with 2 strokes. I have run a 48 pilot and 160 main on a 35 pwk and its multipoint seized on me 4 times total.

What throttle position is it seizing at? Forged piston or cast? Adequate piston to wall clearance? Compression? What temperature was it? Having that many means you likely have an air leak, have way too lean of jetting, piston to wall is too tight, or you're just not warming it up enough. Forged pistons are notorious for cold seizing if they aren't warmed enough.

I would up that pilot jet to start, especially if its cold out where you're at.

 

[turbowrenchhead]

Its a 68mm wiseco. Clearance is at .004. Compression is suppose to be 160 psi. It was 18 degrees out the last time. It was running for a 1/2 hour at mild use before I started getting on it. I made about 10 laps on an ice oval trying to catch a warrior. I never got over 1/2 throttle and it seized when coming up to a corner and letting off from 1/2 throttle. Anything over 1/2 throttle is levels off, no more power increase. I have pulled the motor since last time and went through several suggestions. Case resealed with yamaha bond, new crank seals, rehoned cylinder, new rings, cleaned up piston and leaktested. Change the plug cap, old one was out of spec by 300 ohms. When to a a B9ES plug was running a BR8ES. Had a unifilter clamped directly to the carb. Now its on the end of a 6" pvc pipe. Got a 6.0 slide with a CEL needle set in the middle. I was running a 48 pilot and a 160 main for the 3 multi point seizers on those jets. The 3 seizers were during last october durning 50 degree weather and the piston to cylinder clearance was at .002 then. But the same jets.
I'm headed out the garage in a few minutes to see if I can dial in the pilot per procedure.

 

[brandoz28]

Go up on the pilot, and raise the needle. I would go ahead and bump that main a hair while you're in there. Also verify your float level.

 

[turbowrenchhead]

I have a 52 pilot and a 165 main and I dropped the clip on the needle to the richest setting. I did a plug chop at 30 degrees and it started to look like the color I need. I've got a richer needle coming and a few more main jets. I read a couple of articles that the member's posted on jetting and that helped a lot. I now have a good understanding of what I need to do. I had no idea before hand. It was trail and error before with much error. lol.

 

[brandoz28]

I have a 52 pilot and a 165 main and I dropped the clip on the needle to the richest setting. I did a plug chop at 30 degrees and it started to look like the color I need. I've got a richer needle coming and a few more main jets. I read a couple of articles that the member's posted on jetting and that helped a lot. I now have a good understanding of what I need to do. I had no idea before hand. It was trail and error before with much error. lol.

glad you're getting it figured out, and sorry that you had to break so much stuff to get there!