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  40 Merc, 4 stroke, little engine quirk

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Author Topic:   40 Merc, 4 stroke, little engine quirk
HuronBob posted 08-10-2004 10:24 AM ET (US)   Profile for HuronBob  
Folks, I've noticed an odd quirk with the 40 hp, 4 stroke Merc on the new (two weeks old) 130 BW sport.

I live on a chain of lakes with "no wake" zones on the river between the lakes. For me this means putt-putting along at about 1200 rpms or so. I've noticed an odd quirk with this engine.

For no reason (at least no reason that I can put my finger on), the engine will jump from 1200 rpm's up to about 1400 rpms for about 1/2 to 1 second, and then drop down to about 1000 rpms.

I've noticed no pattern in this, it can happen right after I've established the original speed or after I've been going along for 10 minutes or so. I'm certain that I'm not touching the throttle at the time, no one is stepping on the fuel line, I'm not in a weed situation.... This has happened at least 20 times since I picked up the boat.

The only real problem with this is it can catch you a little off guard when it accelerates (even that small amount), and, of course, a concern that it indicates a larger problem. If it were just dropping down I would figure it was just the throttle slipping down a bit, but that initial INCREASE in rpms has me baffled.

Any thoughts on this from you experts?

Thanks in advance...


Such posted 08-10-2004 07:12 PM ET (US)     Profile for Such  Send Email to Such     
Perhaps posting this in the performance section might solicit more responses. I would bring it back to the dealer.
AQUANUT posted 08-10-2004 09:48 PM ET (US)     Profile for AQUANUT  Send Email to AQUANUT     
you didn't mention if it was a EFI or carbed motor?
I'll bet its an EFI motor right?
HuronBob posted 08-11-2004 08:02 AM ET (US)     Profile for HuronBob    
yep, it's efi....

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