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post #1 of 9 (permalink) Old 04-10-2014, 01:43 PM Thread Starter
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Size 45 pilots?

Hey all. I have 42 pilots in both carbs, and I'm 4 turns out on the rear cylinder and 3 out on front. Both plugs are showing lean, and I have a subtle quiet pop on deceleration (fixed my crazy pop problem by cleaning out the coasting enricher port and sanding surfaces smooth.)

I haven't seen anyone here use size 45 pilots. I also need to up my 140 mains.

Is there something else I should check before upping the pilots? Float bowls are good, I just checked the levels. I just sync'ed the carbs - I was off by almost a quarter turn!

Pod filters, custom exhaust with baffles, and good fuel flow to carbs. Vent tube is taken care of as well.

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post #2 of 9 (permalink) Old 04-10-2014, 04:16 PM
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Quote:
Originally Posted by crowley1027 View Post
Hey all. I have 42 pilots in both carbs, and I'm 4 turns out on the rear cylinder and 3 out on front. Both plugs are showing lean, and I have a subtle quiet pop on deceleration (fixed my crazy pop problem by cleaning out the coasting enricher port and sanding surfaces smooth.)

I haven't seen anyone here use size 45 pilots. I also need to up my 140 mains.

Is there something else I should check before upping the pilots? Float bowls are good, I just checked the levels. I just sync'ed the carbs - I was off by almost a quarter turn!

Pod filters, custom exhaust with baffles, and good fuel flow to carbs. Vent tube is taken care of as well.

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I didn't make a good user name and I can't change it, so please call me Nate.
Running lean can be caused by sucking in too much air. A couple of options would be to restrict your air filters a little or try turning your air/fuel mixture screws IN, and also check that your carb float is adjusted to the right height to supply adequate fuel.

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post #3 of 9 (permalink) Old 04-10-2014, 04:31 PM
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Man, this post is going to win friends and influence people.

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Originally Posted by crowley1027 View Post
Hey all. I have 42 pilots in both carbs,
So, your m/c makes 22% more power than stock? At the same throttle opening, all in the bottom 1/4 of the throttle?

Without changing the pilot air jet (95), I would not go above a #40. Due to less emulsification, I would expect a 42 to net about the same gas to the cylinder as a 40. I would expect a 45 to net less gas than a 40. Why don't you try and post the results?

Quote:
Originally Posted by crowley1027 View Post
and I'm 4 turns out on the rear cylinder and 3 out on front.
The little fine needle on the end of the pilot air screw is 3 1/2 turns long. That needle is completely out of the orifice at about that point.

Quote:
Originally Posted by crowley1027 View Post
I also need to up my 140 mains.
I would not go above a 140 without changing the main air jet (100). Once again, you can keep raising the jet size until a monster hole in the fuel curve occurs. All of this would be useful info here.

Last edited by wmsonta; 04-10-2014 at 04:47 PM.
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post #4 of 9 (permalink) Old 04-10-2014, 08:10 PM
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I agree with wm.shouldn't need anything higher than 140/40(probably why no one on here runs 45's).are you either coastered or marbled? If not that'll cause some popping

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Last edited by OleDirtyDoc; 04-10-2014 at 08:12 PM.
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post #5 of 9 (permalink) Old 04-10-2014, 08:22 PM
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Been there done that. Ive got 45's and 150's in right now. Its going to 142/42 this weekend. Im showing rich on the plugs, even with open carbs and straight pipes.

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post #6 of 9 (permalink) Old 04-10-2014, 08:31 PM
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Melissa had pods and the screamin eagle mufflers have barely any baffles

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post #7 of 9 (permalink) Old 04-10-2014, 08:48 PM
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With the pressed in air jets, there is not a lot of room to jet. Sadly, they saw fit to under carb the vn (the old kz 750 twin had 38mm mikuni's @ 60 hp). Kawasaki wanted the fast intermediate circuit. I can start the intermediate circuit just above 2k at WFO..
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post #8 of 9 (permalink) Old 04-10-2014, 10:33 PM Thread Starter
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Using cheap Chinese pods with foot socks over them. Will spend more to get the k&n filters soon. I'd bet that air restriction (or lack thereof), is something I've looked over. Will post results then

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post #9 of 9 (permalink) Old 04-11-2014, 11:10 PM
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Being "lean" on the pilot circuit with 42's makes me suspect the pressed in air jets got a little trash in them. With the bowls drained try blowing some air through the little venture tubes in the lower part of the carb intakes and try to blow the trash back into the bowls.

Of course the trash could be sucked back up but worth a try.

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