can't get motor over 2500 rpm

[rignig]

My Ocean pro 200 (98) has been sitting for about 6 months. Has stabil with ethenol in the tank. I usually run it every month or two while it sits to keep the carbs cleaned. But it would not start about 3-4 months ago. Being winter I did not do much with it. I eventually had it looked at and mechanic said it was the pwer pack due to the motor only firing on one side. Changed the power pack and it started right up. I put it in the water for a test runs and I cannot get it over 2500 rpm while in forward. Unable to get to plane so it is pretty worthless. While in netruel I will rev over 2500 but not while in forward. I changed the fuel filter and swapped props and still no change. I am thinking it is the Carbs. Does that sound right and If so is the only way to fix to have them re built or can I try to clean them on my own. Or could the power pack I put in be bad? Any help is appreciated. Thanks

 

[iwombat]

Re: can't get motor over 2500 rpm

Start with the basics, compression check and spark test and go from there. It could be a lot of things, let's start eliminating a few.

 

[SparkieBoat]

Re: can't get motor over 2500 rpm

check spark on each coil.remove all plugs while testing spark...get a spark gap tester from local auto supply...should have spark at 7/16 gap..let us know results.

 

[rignig]

Re: can't get motor over 2500 rpm

I can change parts but checking stuff may need some help. How do I check the spark, pull plug and start the motor?

 

[SparkieBoat]

Re: can't get motor over 2500 rpm

remove all plugs and get a spark gap tester. they are cheap and very handy

 

[rignig]

Re: can't get motor over 2500 rpm

I checked the gaps. they are fine. The problem is I am only getting spark on my top two cylinders. Could the powerpack I installed be bad? before I had spark on 3 cylinders. The mechanic said it was the power pack

 

[iwombat]

Re: can't get motor over 2500 rpm

Top two cylinders indicates both power-packs are working - you have two.

I believe the timer base operates top and bottom though. Try switching the leads from your timer base to your power packs (if possible on that model) and checking spark. See if the problem moves.

(And please describe what you mean by "checking gaps")

 

[rignig]

Re: can't get motor over 2500 rpm

I have no idea what the timer base is. I checked the gap on the plugs and they were good. I did move the wire which feeds the coil(s) on the top to the bottom cylinders and they worked. Meaning the issues is arising from the powerpack. It appears its not sending signal to the bottom 4 cylinders. Hope that makes sense. Hard to explain over the computer

 

[daselbee]

Re: can't get motor over 2500 rpm

Uhhh...he has one power pack.
The guys were not suggesting you check the gap of the plug istelf, they were suggesting that you test how big a gap the spark actually jumps using a spark tester. It should jump 7/16" across an air gap, with all plugs out and turning at starter speed, with the spark tester tool installed on (one at a time) on all six cylinders.
Plenty of posts on here how to do that. Use the search function.

Double check your mechanic's work. Look for improperly plugged connectors under the pack, pushed back pins in the connectors, or even maybe he has left off the black ground wire that is supposed to be attached on the starboard rear pack mounting stud.

go to www.cdielectronics.com and find their ignition system debugging pages. Step thru it. You have a V6 90* looper, it is NOT optical ignition.

Good luck.

 

[rignig]

Re: can't get motor over 2500 rpm

Thanks for the gap clarification, as for the power pack install i would have no one to blame but myself as I installed it. The ground is good, and I checked once but I check the connections again. I hope that is all it is

 

[rignig]

Re: can't get motor over 2500 rpm

found this on CDI page, thanks for the link

ENGINE WILL NOT ACCELERATE BEYOND 2500 RPM (Runs smooth below that RPM):
1. Use a temperature probe and verify that the engine is not overheating.
2. Disconnect the tan temperature wire from the pack and retest. If the engine now performs properly, test and replace the
defective temperature switch.
3. Make sure the tan temperature switch wire is not located next to a spark plug wire.
4. Disconnect the VRO sensor from the engine harness and retest. If the engine performs correctly, replace the VRO or sensor.

 

[daselbee]

Re: can't get motor over 2500 rpm

Nope that's not it. You would follow that idea IF you had verified good spark on all cylinders. The words you refer to above are regarding overheating and safe mode.

Get them all sparking to spec. If you put that pack on, make srue you didn't pinch wirres to ground under the pack when you remounted it. I would absolutely pull thgat pack up, check all connections, and then run it with the pack up. Make sure wires cannot hang in flywheel. Put the ground under a coil screw on the top starboard coil. See it if has spark on all cyls then.

 

[daselbee]

Re: can't get motor over 2500 rpm

Here is the guide to follow:

http://www.cdielectronics.com/downl...linder 1988-2000 185-250 HP (Quick-Start).pdf

 

[iwombat]

Re: can't get motor over 2500 rpm

oops, sorry about the one vs. two power pack gaffaw. I also don't know what I was thinking with respect to the timer base. I blame giving up coffee last week.

Anyway, get those cylinders all sparking correctly. Power-packs tend to fail on a side-to-side basis not top-to-bottom. So, I would not suspect your power-pack. You can also try swapping coils around and see if the problem moves.

An air-gap spark checker and a remote starter (available at any auto-parts store) will be your best friends during this procedure.

You can make a simple spark checker out of nails and a board. There's lots of details in old posts about how to do that.