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Tuning issues need some help
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dcavy
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PostPosted: Sun Jul 24, 2016 7:25 am    Post subject: Tuning issues need some help Reply with quote

Hoping someone can help me out. I recently swapped my 40 hp for a 1641. I have dual Weber 40s on it and converted to electronic pointless ignition. Has a tri mill twin exhaust. My issue is that on every gear it hesitates unless I'm hammering the throttle. Ive swapped the main jets 3 times thinking its been a fuel issue. Swapped the idles twice and had converted the standard centrifugal points to a compufire pointless setup. Plugs seem to look ok just can't get that lag in power if I'm easing into the throttle. Any suggestions? I did check timing and that was ok too.
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Dale M.
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PostPosted: Sun Jul 24, 2016 8:35 am    Post subject: Re: Tuning issues need some help Reply with quote

If you are running 009 distributor that may be your problem...

you state timing is ok, but what was settings...

Dale
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dcavy
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PostPosted: Sun Jul 24, 2016 9:00 am    Post subject: Re: Tuning issues need some help Reply with quote

30 degrees btdc max and yea it's a 009 centrifugal dis.
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vwracerdave
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PostPosted: Sun Jul 24, 2016 9:13 am    Post subject: Re: Tuning issues need some help Reply with quote

Lets see some pictures.

I guessing you got several things going on and the twin exhaust may be the main reason.
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mark tucker
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PostPosted: Sun Jul 24, 2016 9:55 am    Post subject: Re: Tuning issues need some help Reply with quote

recurve the dist. you can go up in idle&main jet but thats covering it up not fixing it.
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Motor60
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PostPosted: Sun Jul 24, 2016 2:06 pm    Post subject: Re: Tuning issues need some help Reply with quote

With my 1776 I had:
Dual 40idfs
28 vents
50 idles
115 mains
180 airs
009 dist but my max was 28 degrees

And some NGK BP6et spark plugs. Ran damn good.
Can't imagine you would too far off from these jets. After getting help from John, I started from scratch. Took apart carbs. Cleaned and compressed air the carbs. Reassembled. And new spark plugs.
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dcavy
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PostPosted: Sun Jul 24, 2016 2:41 pm    Post subject: Re: Tuning issues need some help Reply with quote

So here's where I'm at now. 125 mains. 55 idle jets. I had 115 mains and it kept backfiring thru the carb or "sneezing" while I'd be cruising till I went with the 55s. Then I noticed I lost some power when I swapped idles so I made a call to CB performance and they suggested I swap for 120s or 125s so that's where I'm at now. These Weber Idfs are the older style without the fuel pump actuated adjustment so I have no adjustment there.
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dcavy
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PostPosted: Sun Jul 24, 2016 2:51 pm    Post subject: Re: Tuning issues need some help Reply with quote

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madmike
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PostPosted: Mon Jul 25, 2016 4:08 am    Post subject: Re: Tuning issues need some help Reply with quote

should be close with
115 mains
F-11
200 airs
50 idles 28 vents
check fuel pressure!!!!!!!!!!!!!!!
& float level!!!!!!!!! & for in take leaks Wink
get a 4 into 1 Merged header 1 3/8" Rolling Eyes Wink
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porkchop-rob
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PostPosted: Mon Jul 25, 2016 8:54 am    Post subject: Re: Tuning issues need some help Reply with quote

check fuel pressure and floats for sure.

get a wideband (either rent or buy one - I use http://www.plxdevices.com/Wideband-O2-Touch-Screen-Multi-Guage-p/897346002719.htm)

55 idles are almost certainly too big. Be sure you are correctly setting the idle mixture, the bypasses are closed, and they are well sync'd.

read the WIDEBAND thread start to finish....its a lot of work, but its a goldmine of info.
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Motor60
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PostPosted: Thu Jul 28, 2016 6:46 pm    Post subject: Re: Tuning issues need some help Reply with quote

I see your problem. Those emojis are blocking air from the carbs. And you have no exhaust on there Rolling Eyes

Put your exhaust back on with METAL gaskets. You probably haven't cleaned out carbs GOOD and blew them out with compressed air. You haven't mentioned you reset the floats. Make sure your manifold nuts are tight so no intake leaks. Adjust your valves.

55s too big for 40 IDFs. Guaranteed 50s is your answer. And give pics of your spark plugs so we can see your jetting. Sounds like you still have some work to do
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Dale M.
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PostPosted: Thu Jul 28, 2016 6:48 pm    Post subject: Re: Tuning issues need some help Reply with quote

No tail light lenses either...

Dale
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"Kellison Sand Piper Roadster" For Street & Show.
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Motor60
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PostPosted: Fri Jul 29, 2016 8:22 am    Post subject: Re: Tuning issues need some help Reply with quote

Oh and put the apron tin back on
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