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LIRUSS
 Post subject: rd 400 main jet help
PostPosted: Thu Apr 12, 2012 9:11 am 

Joined: Mon Jan 16, 2012 11:49 am
Posts: 208
Location: L.ong I.sland NY
what main jet is recommended for a 76 rd400 with dg pipes ? is the stock size 140 ?
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evansje1
 Post subject: Re: rd 400 main jet help
PostPosted: Thu Apr 12, 2012 9:09 pm 
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Joined: Wed Jun 08, 2011 10:10 pm
Posts: 1503
Location: Heber Springs, Arkansas
I can't tell you what size but I can tell you it will not be the stock main jet size. It also depends on if you are running stock air box or a Y boot, stock carbs or larger carbs, and stock or modified porting. Jump on this forum http://www.2strokeworld.com/forum/index.php and give the complete set up and I bet you will get some pointers. My Daytona is running chambers, Yboot, VM30's and I am running 230's on the mains.

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1973 RD350, 1979 RD400F, 1984 RZ350, 2014 Suzuki Vstrom 1000
CHRIS AND JEFF ARE THE MEN
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LIRUSS
 Post subject: Re: rd 400 main jet help
PostPosted: Thu Apr 12, 2012 11:46 pm 

Joined: Mon Jan 16, 2012 11:49 am
Posts: 208
Location: L.ong I.sland NY
im running stock carbs, stock air box & boots with a uni foam filter & dg pipes, currently running 150 mains but it runs like crap ! thanks for the link
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evansje1
 Post subject: Re: rd 400 main jet help
PostPosted: Fri Apr 13, 2012 5:46 am 
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Joined: Wed Jun 08, 2011 10:10 pm
Posts: 1503
Location: Heber Springs, Arkansas
Russ, The main jet is only going to make it run like crap at the wider throttle openings 3/4 to full. You sure it is not the needle height or something else?

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1973 RD350, 1979 RD400F, 1984 RZ350, 2014 Suzuki Vstrom 1000
CHRIS AND JEFF ARE THE MEN
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LIRUSS
 Post subject: Re: rd 400 main jet help
PostPosted: Fri Apr 13, 2012 8:49 am 

Joined: Mon Jan 16, 2012 11:49 am
Posts: 208
Location: L.ong I.sland NY
you might be on to something ! dam , i wish i had more time for tinkering & road testing
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Ja-Moo
 Post subject: Re: rd 400 main jet help
PostPosted: Fri Apr 13, 2012 2:30 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Mark and Dave will fix you up at the Gap......

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........
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evansje1
 Post subject: Re: rd 400 main jet help
PostPosted: Fri Apr 13, 2012 5:03 pm 
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Joined: Wed Jun 08, 2011 10:10 pm
Posts: 1503
Location: Heber Springs, Arkansas
Ja-Moo wrote:
Mark and Dave will fix you up at the Gap......


Dats what you need to do and I'll supervise! :D

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1973 RD350, 1979 RD400F, 1984 RZ350, 2014 Suzuki Vstrom 1000
CHRIS AND JEFF ARE THE MEN
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