ultra 150 no power

[drewski]

I have a 99 ultra 150. I just rebuilt the motor and have about 110 psi on each cylinder. While going through the SBT break-in process for rebuilds using 50:1 premix along with the oil injection, it was apparent the ski would not go over 4000 rpm. it gets there at about 1/4 throttle and never goes higher. It really bogs and misses...especially when taking off. I put new plugs in prior to starting step 3 of the break-in as per the procedure.....no change. I filled the gas tank back up with 93 octane and fuel system cleaner...no change. The plugs are always wet with oil when I take them out. also, coincindentally, the speedometer quit working...any relationship?


It acts like fouled plugs, but I don't know why the new plugs did not help.


Any help would be appreciated

Thanks

[flippinskis]

is it definitely still firing on all 3?

[drewski]

it sure seems like it except for when it misses....which is nearly all the time it is under a load. It idels great. when no load it snaps right up to 8000 rpm.

[mikecox1]

Have you tried trimming your plug wires?

By the way, did you ever solve the issue of why your previous motor let go. Are you sure you aren't running lean or that you don't have a carb problem?

[drewski]

have not tried trimming the plug wires. Is this difficult?

The other had a crack in the oil line to #2 cyl. lost lube. don't know about carb problem. it idles great and runs well with no load

[mikecox1]

No, it's really simple. To trim the wires you cut off the zip ties on the plug boots and pull the boot off of the wire (twist as you pull it off). trim 1/4 inch or so off of the end of the plug wire and reinstall the plug boot (once again twisting the boot as you put the wire back into the boot (1/2 of a twist will do). There is a spike inside of the plug boot that pierces into the center of the wire. Over time water can corrode that connection and cause a weak spark. After you have reinstalled the wires into the boots install new zip ties on them to keep them in place.

[mikecox1]

Also, while not 100% required, it would be ideal to put a little dielectric grease on the end of the newly cut wires before inserting them into the plug boot to stave off corrosion and repell water.

[drewski]

thanks,
I'll try trimming the plug wires

[drewski]

NO LUCK! I trimmed the wires put it back in the water.....same thing??????

[Wavetech PowerSports FL]

Who built the motor?