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Jetting help


Mod Banshee

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Temp, elevation...type of premix and oil ratio?

 

Are you looking at the insulator nose or doing a proper plug chop?

 

http://www.dfn.com/benkaren/plugchop.html

 

I run 150 mains in my 4 mil cub, which has drag port timings out of the box...

 

Don't be surprised if you go down to a 142, 145 or so on that build, but I wouldn't read the plug at the tip, you need to do the chop.

 

How does it run, by the way?

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Try new plugs, try new caps on the end of the spark plug leads.

 

Your jetting is close enough to get it to run....and probably run well.

I'm going to assume since you have 35's ALL of the old Tors stuff is removed and properly disconnected....including the thumb throttle and parking brake TORS junk.

 

You can ohm out the stator and coil...no way to check a CDI that I know of...

When you put it back together, what did you set the flywheel air gap at for the pickup?

Book calls for .020...try .015.

 

If the electrical checks out...time for a leak down test.

 

When I first built my motor, I tried every jet in the stock carb from 380 down to 220s. Every needle position on two different needles....and it was rich no MATTER what...

 

Ended up being the base and deck of the cylinder weren't sealed....

 

I'd honestly say at 150 mains, it MIGHT be rich...but good enough to run without backfiring and popping. Check electrical first, then leak down test it....

 

If you need a leak down tester, you can build your own...or spend a couple bucks more and buy a kit already made and ready to go. Bob @ RB racing sells a good one.

 

PM him here at machwon...or call him @ (517) 388-3662.

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