Moderated Discussion Areas
  ContinuousWave: Whaler Repairs/Mods
  1988 Evinrude 30-HP Won't Run At Full Throttle

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   1988 Evinrude 30-HP Won't Run At Full Throttle
smallboat7 posted 07-14-2006 06:41 PM ET (US)   Profile for smallboat7   Send Email to smallboat7  
I have a 30-HP 1988 Eevinrude that WILL NOT run full throttle. It's been worked on for about two months now and the mechanic is stumped. It cranks and idles just fine. It even runs about half throttle fine, but, once you push the throttle all the way down, it picks up for about one second and then bogs down (stalls) to slow speed. The powerpack and coils have been checked, the fuel pump has been replaced. The problem is not bad gas. The only thing that will make it run full speed is to remove the cover and then place your hand over the carb opening. It doesn't have a breather/cover over that opening, and the mechanic says it won't help. He suggests an entire new carburetor. I don't know too much about boats. Please help if you can. ~Dara
pglein posted 07-14-2006 06:54 PM ET (US)     Profile for pglein  Send Email to pglein     
That's strange. I would rebuild the caburetor(s) before replacing them. This is easier than most people think and a heck of a lot cheaper. Marine two-cycle carburetors are like putting together link-n-logs compared to the ones you find in a car, and it really never hurts to have them freshly rebuilt.

While you have the carburetors off, check the reeds. I once had one fail on a 30-HP Johnson, and although my memory is quite hazy (it was nearly 20 years ago), I seem to recall the symptom being that it didn't make the power it should. Anyway, these also affect fuel delivery, which seems to be your problem.

smallboat7 posted 07-14-2006 06:58 PM ET (US)     Profile for smallboat7  Send Email to smallboat7     
Thanks. Would you suggest just buying a carb kit and replacing it all as I rebuild it?
JBCornwell posted 07-14-2006 08:52 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
The "usual suspects" have been addressed, smallboat, unless the high speed circuit in the carb has been cleaned unsuccessfully. Worth checking that possibility. A new carb would be a waste.

Look at the primary symptom: Does not get enough fuel to run WOT, but runs fine when it needs less fuel.

Look for restrictions or air leaks somewhere in the fuel supply system. Restricted venting of the fuel tank, restricted pickup, stuck anti-siphon valve, pinched fuel line, air leak at a line connector, restriction in the primer bulb.

Also, you need to find a technician/wrench who troubleshoots the whole system and repairs it, rather than replacing parts until it starts to work, and puts the original fuel pump back when his easter egging fails to fix the problem.

Red sky at night. . .

an86carrera posted 07-14-2006 10:30 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Had a very similar problem.

Turned out to be rubber tipped float valves sticking. Replaced with metal, has run purrfect since.

Good luck

snookwhaler posted 07-16-2006 12:47 PM ET (US)     Profile for snookwhaler  Send Email to snookwhaler     
All you need is to have the carb cleaned and rebuilt.

I have been throught this exact same problem three times on various engines over the past two years (25, 30, and current 35). Having the carb "tanked" will clean all the crud off of everything. Then just reassemble with a good rebuild kit. Works like a champ. On this last one (the 35). I opted not to "tank" it and just took it apart and cleaned the heck out it with carb cleaner. Then just reassemled.

Works flawlessly.

whaler16 posted 07-18-2006 12:38 AM ET (US)     Profile for whaler16  Send Email to whaler16     
I had the same poblem w/ my '82 35hp evinrude. Rebuilt the carb. and fuel pump. Turned out to be a bad primer bulb.

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.