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Pinhead pat
MMT Pro Member
Joined: Mon Aug 13, 2018 2:32 pm
Posts: 105
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 Gutted stock muffler & mikuni carb question I have a 36hp PD with a mikuni 42hsr carb and BPS Q muffler. Both carb and muffler are shot so i bought a new carb and a $40 stock muffler from prodigy. I want to gut the muffler since it seems like that is the way to get best performance on a stock motor with mikuni carb. Can anybody tell me what size jets i will need for the carb? It came with a 97 main jet. My old one had a 97 too but it seemed to run rich, but it was also pretty fucked up so.... Any input is appreciated. Thanks fellas
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| Thu Jun 20, 2019 6:02 pm |
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Will
MMT Elite Member
Joined: Fri Jul 08, 2011 1:54 pm
Posts: 8133
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Re: Gutted stock muffler & mikuni carb question 97? Main jet? Not sure what you have, should be 160's...
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| Thu Jun 20, 2019 7:57 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Gutted stock muffler & mikuni carb question You bought a new mikuni? What was wrong with the old one that warranted you spending another $250+?
And yeah, main jet should be somewhere around the 155-162.5 range for it.
#CFFITR
#GhostBoat
#Whoneedsphysicsihaveamudmotor
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| Thu Jun 20, 2019 10:40 pm |
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bluesky2012
MMT F.E.
Joined: Mon Jul 14, 2014 8:19 am
Posts: 981
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Re: Gutted stock muffler & mikuni carb question
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| Fri Jun 21, 2019 8:20 am |
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banded-mallard
MMT 1000 Club
Joined: Wed Oct 07, 2009 8:18 pm
Posts: 4310
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Re: Gutted stock muffler & mikuni carb question
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| Fri Jun 21, 2019 11:05 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Gutted stock muffler & mikuni carb question It's probably the jet sizes converted to some cross reference thing using common core math. 2+3=lawnmower
#CFFITR
#GhostBoat
#Whoneedsphysicsihaveamudmotor
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| Fri Jun 21, 2019 2:08 pm |
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Pinhead pat
MMT Pro Member
Joined: Mon Aug 13, 2018 2:32 pm
Posts: 105
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Re: Gutted stock muffler & mikuni carb question
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| Fri Jun 21, 2019 3:20 pm |
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Pinhead pat
MMT Pro Member
Joined: Mon Aug 13, 2018 2:32 pm
Posts: 105
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Re: Gutted stock muffler & mikuni carb question I took it to delta for them to tune it up back when i live in morgan city because i kept having to fuck with it (i’m still learning about this stuff and was over it) well they took it apart and said they couldnt even do anything with it i cant remember exactly what they said was wrong but i know it was missin some stuff and apparently somethin was so bad they said i need a new one even after i told them i was absolutely not gonna buy one from them for $500 when i could get it on amazon for 250 (there is a whole kit on there right now for 150) so i went ahead and bought a new one but im not going back to delta
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| Fri Jun 21, 2019 3:24 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: Gutted stock muffler & mikuni carb question I'll give you $10 for the one that cant be fixed.
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| Mon Jun 24, 2019 9:24 am |
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Pinhead pat
MMT Pro Member
Joined: Mon Aug 13, 2018 2:32 pm
Posts: 105
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Re: Gutted stock muffler & mikuni carb question
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| Mon Jun 24, 2019 10:35 am |
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dead animal
MMT 1000 Club
Joined: Fri Jan 16, 2009 3:18 pm
Posts: 1726
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Re: Gutted stock muffler & mikuni carb question maybe you could also just find a stock carb and put on a stock muffler and have a motor you won't have to wrench on. might be an option, might not. i have found stock carbs from guys who bought other carbs for dirt cheap.
good luck!!
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| Mon Jun 24, 2019 6:39 pm |
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JBsuperG
MMT Pro Member
Joined: Wed Mar 21, 2018 2:51 pm
Posts: 263
Location: Michigan
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Re: Gutted stock muffler & mikuni carb question I have a stock carb I would sell. Only has about 2 hours on it.
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| Mon Jun 24, 2019 6:54 pm |
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Pinhead pat
MMT Pro Member
Joined: Mon Aug 13, 2018 2:32 pm
Posts: 105
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Re: Gutted stock muffler & mikuni carb question
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| Mon Jun 24, 2019 7:00 pm |
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