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Old 05-02-2016, 07:42 PM
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TLR67 TLR67 is offline
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Calling all Holley 4160 Experts....

Took the boat out this weekend and with a fresh rebuilt Holly by Carburetor Specialists in GA there seems to be a slight hesitation/backfire @ 35 before she kicks in.... Boat status is below...

1990 Prostar 190 Indmar 351 W
Carb (4160 Totally rebuilt at the end of last year)

Just put in 8 New Autolite 24's Gapped at .035 today....
Fresh fuel filters and Water separator
Checked intake screen in Carb and clean...
Set dwell in Accelerator pump to Holley specs..
Needles 1 3/4 out
Cleaned entire Fuel tank and lines this winter... its getting plenty of gas....
Tried setting the timing @ 600 RPM at 9 all the way through 15 Degrees but on 10 it runs the best...
New Plug wires.. Rotor and Cap....
Presto Electonic Ignition...



All in all the boat runs great and in Neutral it sounds fine reved up with no back fires... However under load it hesitates a bit up to 35 then it all kicks in to 45.... I tried the mixture screws from 2 out to .25 out and it still does this..
I am thinking the secondaries are not right and there might be a split bladder or something.. I called the place that did the carb and they said it was built back to Mastercraft specs with the Black secondary spring (Hardest) so I don't know if that could be it..... I do want to confirm with you guys the firing order on the wires though..... I have them as pictured below with the 1-3-7-2-6-5-4-8 order with #1 BEING the bent wire @ 6 oclock on the cap here... Any ideas on what to do next? Boat is running at 90% but I need it at 100%...


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  #2  
Old 05-02-2016, 07:53 PM
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tockit tockit is offline
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Quote:
Originally Posted by TLR67 View Post
seems to be a slight hesitation/backfire @ 35 before she kicks in....
3500 RPM?
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  #3  
Old 05-02-2016, 07:57 PM
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tockit tockit is offline
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Have you tried a different accelerator pump cam?

http://http://www.summitracing.com/p...FQ2QaQodlvUJjg
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Old 05-02-2016, 08:42 PM
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TLR67 TLR67 is offline
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Quote:
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3500 RPM?
No 35MPH
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  #5  
Old 05-02-2016, 08:43 PM
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Quote:
Originally Posted by tockit View Post
Have you tried a different accelerator pump cam?

http://http://www.summitracing.com/p...FQ2QaQodlvUJjg
No I have not..... Would it really need one?? Seems like it should be OK Stock....
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Old 05-02-2016, 09:06 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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This sounds more like an ignition issue to me. I would first check your voltage at the coil with the key on engine off. You should see battery voltage with a minimum of 11.5 volts. If you have less than 11.5 volts, this is one of the issues you can encounter.
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Old 05-02-2016, 10:09 PM
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TLR67 TLR67 is offline
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Quote:
Originally Posted by thatsmrmastercraft View Post
This sounds more like an ignition issue to me. I would first check your voltage at the coil with the key on engine off. You should see battery voltage with a minimum of 11.5 volts. If you have less than 11.5 volts, this is one of the issues you can encounter.
I will check it... I did swap to a back up coil during the Knocking scenario this year.... Thanks...BTW, DO THOSE WIRES LOOK TO BE IN CORRECT ORDER TO YOU?
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Old 05-02-2016, 10:14 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Only way to be sure is follow them one at a time. 2 wrong wires will idle ok but cause backfiring too.


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S5 WHEEL PACKAGE - FREE SHIPPING
TWO WHEELS W/ST205/75R14 KENDA TIRES $299
- - W/ST215/75R14 KENDA TIRES $ 329
TANDEM AXLE PACKAGE W/205/75R14 KENDA TIRES $599
TWO 5 LUG WHEELS W/ST205/75R15 LRD KENDA TIRES $349 S5 W/BLACK INLAY
TWO 6 LUG WHEELS W/ST225/75R15 LRD KENDA TIRES $359 S5 W/BLACK INLAY


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  #9  
Old 05-02-2016, 10:32 PM
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TLR67 TLR67 is offline
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I did do that and know they are right on the plugs... Its the Distributor cap placement that I am wondering...If you look at this diagram I thought I had them all off by 1..As the differences in 1 att he clips/bolts. I changed them all over 1 spot and the motor would not even try to turn over.... Put them back the way they are shown now and it runs great starting and idling...

http://static.cargurus.com/images/si...1600x1200.jpeg
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  #10  
Old 05-02-2016, 10:51 PM
ted shred ted shred is offline
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It sounds like ignition to me,I had a similar problem when my dist. springs became worn out.
I also see thread sealant on the fuel line into the carb. While it might not be the problem here, I know from experience if it gets inside it will degrade performance.
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