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04-28-2013, 12:13 PM
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#1 |
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Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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vanguard tuning
Just got a 18hp vanguard put in my cart with the heads cut thiner head gaskets isky valve springs billet retainers billet pushrods ported and polished heads and switched to a 2bbl andiI'm trying to tune it with the old check the spark plug burn trick at full throttle runs pretty good and at quarter. Throttle runs well but in the middle it stumbles I checked the plugs at wot and there very white so I know its lean but any advise is apriciated
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04-28-2013, 12:24 PM
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#2 |
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Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: vanguard tuning
Do you have a video of it running at idle, then working the throttle to a higher range? That would help out with the diagnosis. It would be good to actually see your setup.
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04-28-2013, 01:26 PM
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#3 |
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Gone Wild
Join Date: Sep 2012
Location: bikini state
Posts: 2,715
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Re: vanguard tuning
id drill the jets in .015 thousand increments till the plug reads dark brown..thats what ive been doing..with 13hp honda.
the first time was a big diffrence with just .015 now im building it a lil bit better and will prob go another .015 as i read they are better a lil rich than lean  |
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04-28-2013, 03:26 PM
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#4 |
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Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: vanguard tuning
That's what I figured start opening the main jets
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04-28-2013, 03:36 PM
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#5 |
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Raised by coyotes
 Join Date: Nov 2008
Location: Central Texas
Posts: 5,658
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Re: vanguard tuning
It is not uncommon to have a mid range stumble in these motors, they're not designed for it, just wide open, idle or off. I agree you need to open up the jets a little.
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04-28-2013, 03:39 PM
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#6 |
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Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: vanguard tuning
If it is not stumbling at WOT, just running lean, the midrange stumble is likely caused by the low-side jets being too small.
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04-28-2013, 04:04 PM
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#7 |
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Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: vanguard tuning
Low side jets being the ones that feed the carb after the butterflys correct and main jets being Tue ones that pull right out of the bowl of the carb correct
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04-28-2013, 04:05 PM
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#8 |
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Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: vanguard tuning
If that's the case they all need to be larger ?
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04-28-2013, 04:09 PM
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#9 |
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Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: vanguard tuning
That is correct. Be absolutely sure that the carb passages and jets are clear of any debris before opening the jets. The low side jets are used for transition from idle to higher rpm. If you open the throttle all the way from an idle, does the motor fall on it's face? And if you ease into the throttle from idle, is it easier to get it to rev?
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04-28-2013, 04:14 PM
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#10 |
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Gone Wild
Join Date: Nov 2009
Location: mi
Posts: 766
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Re: vanguard tuning
The carb is spotless clean ultrasonic then with a fine tooth comb on rev up you can punch it no lag doesn't lay down or anythin just at w.o.t whene u back off to half throttle it stumbles like its going to quit but never does and the plugs are as white as it gets
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