Join Date: Jun 2002
Location: Charleston, SC, USA
I did all the work on my '97 RT 1100. It surged pretty good when I got it_used.
A large part of fix = spark plugs- not Autolite. I tried many plugs- Brisk, Bosch, NGK. The Bosch and NGK did best and made a significant reduction in surge.
Throttle body tuning.... a fiend suggested setting the TB at idle and then at the speed I ride at, say 3500 RPM. I used a fan to keep the motor cool during this, as I went back and forth between idle and for me 3800 rpm.
The valves I set fairly loose by my standards- ie, go/no go with next size up/down. This combined with plugs and TB made my bike really run like no other. In fact, a friend who had a 2002 1150 RT said my 1100 ran better than his. I agree.
I now have a 02 GSA that runs very good. The other day, I put Autolite plugs in and felt it didn't run as well. I am going back to the NGK $9 a-pop ones. Can't think of the number right now. The ones I took out were had dual electrodes. One 1150R owner said he liked the Split Fire Tri electrode ones. I just don't think the Autolite works as well. The Iridium plugs also worked well on my RT!! best on it, as I remember.
Be sure your air filter is clean.
After some input on riding in the bike's RPM power band, I now ride at a higher RPM more. I found that I tended to run my LT at about 3-4000 in the mountains. After learning more about power band, I went back to mountains and stayed in the 5-7000 range. WHAT A DIFFERENCE!!
Now with my 02 1150 GSA, I find it really likes to stay up in the power band and that greatly reduces any tendency to surge or chug along. Motor just likes it. One service manager also said these motors need to be run and not lugged along.
hope some of this helps. Play with your Valve and TB settings. Nothing is sacred here and you might find your bike wants a slightly varied setting.
-2007 GS Adventure. White