Heat Soak fix

[djarrett]

I know, not this $**t again, but this time it is a direct question.

I have always had the heat soak issue and have heard/read a couple of times about dropping 3-4 sizes on the jet sizes for the intermediate jets. I have a 91 intruder E150GLEIS. It has 2 jets in the front of the carb, small one is 28, larger one is 43.

I wanna try to richen it up to help with the bog, should I put 40's in place of the 43's or 25's in place of the 28's? I would assume replacing the 43's would be the logical ones, and the 28's are for the idling only, but I felt like you guys would know for sure.

Has anyone here tried this with success or is this a really dumb idea?

[SEAHORSE]

since you have a '91,the first of its breed, see an established dealer and ask them to recalibrate the carb throttle bodies per a service letter that came out for that problem back in about'93 or so. It showed the tech how to remove the core plugs and drillout a particular calibration hole about .002" larger.

Actually the letter was for "traileritis" where the motor would bog down while powering on the trailer. It also helped with heatsoak to get the motor running better when the fuel was vaporizing due to heat.

[316jughead]

I have the same motor. I've fought "heat soak" since it was new. Mine would run OK until hot weather and then would run and idle good the first run of the day. After setting a while it did not want to idle and sometimes would stall out and die. It never wanted to push the boat up on the trailer. I missed the letter Seahorse told you about, so my motor has never been modified. I noticed that mine would idle fine all day, but die out when I put it into gear. Pushing in on the key to give it a prime would make it idle in gear for a minute or less. I thought it was a fuel problem and it might have been. My quick start started to take a long time to cut off and let the motor idle down, the thermostat was stuck open. I replaced both thermostats, and the quick start works fine. I raised the idle timing so in gear the idle would be around 800 RPM. I finally gave in and replaced the QL77JC4 plugs that came in the motor with the QL78YC. The purpose of this long post is that for some reason I now have no "heat soak" problem, the last three times out in 100 degree air and 92 degree water I have had no problems. I don't know what the hell fixed it or if it will last, but for now I'm a happy camper. I think I would do as Seahorse said in his post and try to keep the idle up.

[Aaronmac1]

Is there a way to view this Technical Service Bulletin? I'm curious if this is something I can accomplish but would obviously need access to the letter

[ChampioNman]

It is only available to John/Rude dealers.