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hole shot bog problem


jscharphorn

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I have trouble with my hole shot, it just bogs most of the time and the drags are next week and at the moment I will have to bring my 4poke because this thing is not going to cut it.

I am trying to take off in second gear

I have a 421 cub, 33pwk carbs on 110 mix is 32:1 jetting 170 mains 600' elevation.

 sprockets 15/43

22" tires

I have tried a bunch of different gearing and some different jets, needle is currently 2nd from bottom.

any suggestions ?

It seems everything I have tried does not work.

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Compression seems low to not be ported, maybe shees tired. Who cut domes. What needle is in the bike I found d-series needles work the best in Cubs with those carbs . Can you do a plug chop. How do plugs look . Those jets don't alarm me so much

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Motor was completely disassembled and put back together by shawn at proformance prototype after I purchased it used.

I have +10 swinger

110 race gas

New drive line clutch , no lockout

I do not know what needles are in it,  I do not know how to tell .

I did a glug chop last night with 168 mains, to me it looks lean but I am going to have shawn look at it this weekend.

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The needles are marked right near the clip.

The 2 cubs I just tuned both wanted 160 mains. Anything bigger was a big loss in power. Did you check squish?

Bump the timing at least and try again.

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