I need engine troubleshooting help

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   I put my '79 SN in the water for the first time since the engine rebuild this weekend and the results weren't the greatest.  

The engine idle'd and rev'd fine in the driveway, but in the water was a different story.  I launched the boat and all seemed well, I then went to accelerate and the engine would stall between 1500-2000rpm.  I figured out that if you pump the throttle back and forth real fast with small movements you could get the engine to push through the point where it stalled.  Once above 2000rpm the engine performed fine.  I'm guessing the engine was leaning out and pumping the throttle added fuel by moving the accelerator pump.

After this the engine no longer idle'd smoothly.  The idle speed would fluctuate up and down from 650rpm to around 1300rpm, and would eventually die.

I've started to disassemble the carb. and it has a 2.5" Hg Power Valve (which is stock from what I understand) and the main jets are stamped "299", which I can't find in any literature.  It looks like the original jets should have been 66's?

If anyone has any advice I would greatly appreciate it.  I would like to get this resolved and get skiing asap.

Thanks

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AWhite70 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-05-2004 Location: United States Status: Offline Points: 242	Post Options Post Reply Quote AWhite70 Report Post Thanks(0) Quote Reply Topic: I need engine troubleshooting help Posted: June-06-2004 at 10:27pm
	I put my '79 SN in the water for the first time since the engine rebuild this weekend and the results weren't the greatest. The engine idle'd and rev'd fine in the driveway, but in the water was a different story. I launched the boat and all seemed well, I then went to accelerate and the engine would stall between 1500-2000rpm. I figured out that if you pump the throttle back and forth real fast with small movements you could get the engine to push through the point where it stalled. Once above 2000rpm the engine performed fine. I'm guessing the engine was leaning out and pumping the throttle added fuel by moving the accelerator pump. After this the engine no longer idle'd smoothly. The idle speed would fluctuate up and down from 650rpm to around 1300rpm, and would eventually die. I've started to disassemble the carb. and it has a 2.5" Hg Power Valve (which is stock from what I understand) and the main jets are stamped "299", which I can't find in any literature. It looks like the original jets should have been 66's? If anyone has any advice I would greatly appreciate it. I would like to get this resolved and get skiing asap. Thanks

nms1991 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: May-31-2004 Location: United States Status: Offline Points: 46	Post Options Post Reply Quote nms1991 Report Post Thanks(0) Quote Reply Posted: June-07-2004 at 2:11am
	the 299 jets are the same as 66 jets just stamped different for a certain application in the marine market. check your advance to make sure you are advancing at a dwecent rate. if you need technical advice on the carb call holley or email them, they could help you to find the lean out problem in transiton form low to high speed metering. also check out popular hot rodding they did an artical about fine tuning a holley carb in this months issue.

AWhite70 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-05-2004 Location: United States Status: Offline Points: 242	Post Options Post Reply Quote AWhite70 Report Post Thanks(0) Quote Reply Posted: June-15-2004 at 11:54am
	I rebuilt the carb and now all is well. The boat is running great! Not sure what the problem was but rebuilding the carb fixed it.

jameski Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: May-18-2004 Location: United States Status: Offline Points: 368	Post Options Post Reply Quote jameski Report Post Thanks(0) Quote Reply Posted: June-15-2004 at 12:51pm
	Congratulations on your successfull rebuild! What a great feeling! Did your carb kit come with the 2.5" Hg Power Valve? Is that the size you used? I need to rebuild my 4160 and I want to be sure to use the right size. Did you stick with the 66 jets?
	current boat 94 Sport Nautique previous boat 78 Martinique

I need engine troubleshooting help

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