Port engine loses power at 2800

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Grande
Posts: 11
Joined: Jul 20th, '17, 19:07

Port engine loses power at 2800

Post by Grande »

Hi all I have 28bert with twin 260’s
Port side has had some electrical issues and I thought they were resolved looking for new places to trouble shoot. When I try and get on plane the port engine is fine until 2800 rpm then as I advance throttle the rpms fall off if I pull back. Then they come back.

So far replaced distributor coil electronic ignition all msd Boat ran great then started having issues then New plugs wires fuel filter at carb ,water separator fuel pump.
Same issue starboard motor runs fine any ideas where to look
Thanks
current 1977 bertram 28
2015 BW 17 dauntless
past
searay 26 command bridge
searay 25 sundancer
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bob lico
Senior Member
Posts: 5276
Joined: Jun 29th, '06, 19:22
Location: sayville,long island

Re: Port engine loses power at 2800

Post by bob lico »

assuming you have MSD 6A lets start with this. i am not a parts changer!
capt.bob lico
bero13010473
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Bruce
Site Admin
Posts: 3785
Joined: Jun 29th, '06, 12:04
Location: Palm Beach Gardens, Fl.

Re: Port engine loses power at 2800

Post by Bruce »

Are you running mechanical or vacuum or both timing advance. What's your base timing number and advance number at 3400 in neutral.

Is the MSD a ready to run or are you using a 6a or 6al ignition box lIke Bob mentioned.

If your running the 6al (l stands for rev limiter) the Rev limiter can be set as low as 2000 rpm. Has yours been set?
kross1
Posts: 179
Joined: Nov 17th, '17, 15:45
Location: Long Island

Re: Port engine loses power at 2800

Post by kross1 »

Hello All
If we are not positive it is electrical I would also look into the fuel system. Pickup line. Filter, pump, screen in carb.
B28 "NINA PETER SANTA MARIA"
Grande
Posts: 11
Joined: Jul 20th, '17, 19:07

Re: Port engine loses power at 2800

Post by Grande »

Correction it is a petronix flame thrower igniter distributor and matching flamer thrower coil
There is no external ignition box


All filters have been replaced as well as fuel pump
I will check timing last time was set at idle with vacuum gauge
Thanks I will update with more info Monday
current 1977 bertram 28
2015 BW 17 dauntless
past
searay 26 command bridge
searay 25 sundancer
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