MudmotorTalk.com
http://mudmotortalk.com/mmt_v2/

Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowler
http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=69610		 Page 1 of 1
Author:  JCR2013 [ Mon Jan 23, 2017 12:40 pm ]
Post subject:  Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowler
Having a hard time getting my Mikuni dialed in. I have a "pop" that occurs when running just above idle. Also, no matter what size pilot jet i run, my air mixture screw setting will not change. Just 3/4 turn out from bottom.

Anyone out there with a similar set-up have this issue?

HSR 42 Mikuni
30 Pilot Jet
160 Main Jet
97 Jet Needle on 3rd clip position
Author:  cb5331 [ Mon Jan 23, 2017 2:10 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Pilot sounds too big, main sounds too small. Don't remember the needle sizes, but what comes in them works for most, middle clip, one up or one down..

22.5 or 25 pilot works for us

165 or 167.5 i'd guess on the main
Author:  JCR2013 [ Mon Jan 23, 2017 2:19 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
OK... I tried the 27.5 and then 30 pilot jet per the following from the tuning manual...

1. If the best idle is achieved with the air
screw less than one turn out, the pilot jet
is too small and should be exchanged for
a larger one.

Since that didn't help I guess I will put the 25 back in and try other options.
Author:  Will C [ Mon Jan 23, 2017 2:34 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Have you tried tightening the gap on acc pump? Also valves adjusted and good leakdown
Author:  JCR2013 [ Mon Jan 23, 2017 3:31 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
I have the acc pump gap set to a little bit smaller than a credit Card. Valve lash is good. I have not checked leak down. But my top end and idle and everything else seems good.
Author:  Will C [ Mon Jan 23, 2017 6:25 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Does is feel like a "lean cough" u got a video?
Author:  Russ [ Mon Jan 23, 2017 6:35 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Raise the needle by dropping the clip 1 position. Should help that pop if it's lean.
Author:  JCR2013 [ Tue Jan 24, 2017 8:18 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  Will C [ Tue Jan 24, 2017 8:47 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
As russ said,,, raise the needle and see if the extra fuel helps
Author:  JCR2013 [ Tue Jan 24, 2017 9:17 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
https://www.icloud.com/attachment/?u=ht ... z=66005228
Author:  cb5331 [ Tue Jan 24, 2017 9:20 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
I would think it's loading up because of that big ass pilot jet, not leaning out, but I'm no carb guru...
Author:  JCR2013 [ Tue Jan 24, 2017 9:26 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  cb5331 [ Tue Jan 24, 2017 9:28 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Is this a brand new carb? New jets as well?
Author:  Will C [ Tue Jan 24, 2017 9:49 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Watched vid. That sounds like a lean cough. swap to a 170 main and raise needle. Once your dialed in better u can come down a bit on main
Author:  Will C [ Tue Jan 24, 2017 9:50 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Also make sure you have no vacuum leaks
Author:  cb5331 [ Tue Jan 24, 2017 9:52 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Down from a 160?
Author:  Will C [ Tue Jan 24, 2017 10:06 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Down from 170
Author:  cb5331 [ Tue Jan 24, 2017 10:09 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
My bad, I missed that in your post. I'm out... I hate carbs and jetting. :lol:
Author:  JCR2013 [ Tue Jan 24, 2017 10:17 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  Will C [ Tue Jan 24, 2017 10:34 am ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Your crankcase vent should be fine like you have it. Rubber Boot to intake adapter or intake to heads. The bottom line is you need a bit more fuel in that spot
Author:  brickgw [ Tue Jan 24, 2017 2:19 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Where are you located?
Author:  JCR2013 [ Tue Jan 24, 2017 2:22 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  brickgw [ Tue Jan 24, 2017 2:27 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  JCR2013 [ Tue Jan 24, 2017 2:34 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Author:  brickgw [ Tue Jan 24, 2017 2:42 pm ]
Post subject:  Re: Mikuni Tuning - 36 PD, IM Heads, SW Exhaust, 1860 Phowle
Page 1 of 1 All times are UTC - 6 hours
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/