SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: flames on July 21, 2013, 06:05:32 AM

Title: No RPMs
Post by: flames on July 21, 2013, 06:05:32 AM

I haven't had my boat for long and it is a BBF 429 the boat is a 21 ft 1978 Caribbean mini day cruiser. The motor has a little blow by but seems to run good. The problem I have is in the driveway it will hit 5000 rpm with no problem but on the water I can only get 3800 rpm. What can I do to get more out of it. I would like to see 4500 rpm .  Thanks

Title: Re: No RPMs
Post by: cmayer on July 21, 2013, 06:40:46 AM

What pump and impeller cut are you running?

Title: Re: No RPMs
Post by: beerjet on July 21, 2013, 08:59:45 AM

Check timing , fuel delivery....
That's way low.

-beerjet-

Title: Re: No RPMs
Post by: Trukinbear on July 21, 2013, 11:26:57 AM

The first place I'd look would be at the fuel filters, change your inline filter and check to see if your carburetor has an intake screen or filter, if so replace or remove.

Title: Re: No RPMs
Post by: el mojado on July 25, 2013, 08:01:05 AM

I had the exact issue once. Revd up fine in the drive but once in the water (under load) it only hit 3500 and would die eventually. Dirty carb/filter issue. I would start there. Replaced all filters and cleaned carb. Issue gone...any pics of your boat? I just picked up a 79 caribbean mini cruiser project. It needs a floor.

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