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clean plugs

  • Thread starter Thread starter 1100lt
  • Start date Start date
Kieth, I went back out to verify everything and I went 3mph 3000rpms rolled on the throttle idle to full and it pulled all the to that 5500 rpm mark and fell on it's face so then i did the same thing 3rd gear about 3000 rpm hit it wide open shut it down and checked the plugs they were a little black and at the tip they ere close to chocolate. Which was pretty good. I'm thinking before when i checked the plugs i was cruising part throttle home and the were clean arond the tip of the ceramic. Could those air correctors be my problem? Also before when the 138 mains were in there the plugs were scary clean all most white thats why I jumped up the mains fom the kitto 165 now.I know bigger mains don't correct a problem in the low and mid circuits so how would I richen up the mixture in those two areas.(part and mid throttle) This is the only time that i've had the bike and the plugs have ever resembled a chocolate color
 
1100lt said:
Kieth, I went back out to verify everything and I went 3mph 3000rpms rolled on the throttle idle to full and it pulled all the to that 5500 rpm mark and fell on it's face so then i did the same thing 3rd gear about 3000 rpm hit it wide open shut it down and checked the plugs they were a little black and at the tip they ere close to chocolate. Which was pretty good. I'm thinking before when i checked the plugs i was cruising part throttle home and the were clean arond the tip of the ceramic. Could those air correctors be my problem? Also before when the 138 mains were in there the plugs were scary clean all most white thats why I jumped up the mains fom the kitto 165 now.I know bigger mains don't correct a problem in the low and mid circuits so how would I richen up the mixture in those two areas.(part and mid throttle) This is the only time that i've had the bike and the plugs have ever resembled a chocolate color
Click to expand...
OK. If the bike pulls at full throttle for a time before bogging at 5500, that's not the filters being oiled too much. The result would be quicker.
You made quite a jump from DJ 138 to MIKUNI 165?? Remember, DJ and Mikuni size their jets differently. A DJ 138 is nearly the same as a 130 Mikuni jet. You still haven't said what the stock mains are. Just guessing, if your stock mains are 112.5?, I'd try 155 Mikuni mains probably, or very close to that.
To richen the jet needle circuit (approx' 1/5 throttle to 3/4), you raise the jet needles. Your current position (4) has worked for many 1100's with your mods, but you must test at solid 1/3 throttle to determine if a change is needed. I know the 5500 rpm problem is there but you can probably get a good enough read after running it in top gear at that rpm. You can also try the 155 mains and see if that stops the 5500 limit.
As for the pilot circuit, you generally go with 2.5 or 5 larger pilot jets than stock. Richer mixture screw adjustments are usually done too, about 2 to 2 1/2 turns out is typical.
I think your main jet choice is overlapping somewhat and causing the biggest problem.
As for the restrictors, I believe those a relatively newer components in the kit and it hasn't been thoroughly explained to me how they work. They seem to me to be a form of compensation for the extra air flowing in. They cancel each other out somewhat. That makes zero sense and I'd argue that with the entire DJ staff if I had to. You don't introduce more air and then cut it back down, you introduce more fuel to equal things. I think I'd remove them unless someone can tell me exactly what they do to help the jetting.
One other thing, REMOVE the 2 floatbowl vent lines and leave the ports open. Fuel starvation can result, even with CV carbs if you run pods with the lines still attached.
 
It was actually a dj138 to a dj165 I'm gonna go back to the 3rd clip positon. We'll see what happens if nothing then i'll take the air corection plugs out. Cause right now the ceramic is black set at the 4th notch. before they were scary white at 3rd or 4th notch without the air plugs so they did help to richen it up. I have the mix screws out 2 3/4turns i believe the # on the pilot jets were 170 if I take those plugs out i'm gonna have to richen it up. What way do the # run on the pilots? By the way in the kit that came with the bike there are a set of 115 mikuni main jets that I found, also the vent lines have always been off Thanks again Dan
 
Last edited:
1100lt said:
It was actually a dj138 to a dj165 I'm gonna go back to the 3rd clip positon. We'll see what happens if nothing then i'll take the air corection plugs out. Cause right now the ceramic is black set at the 4th notch. before they were scary white at 3rd or 4th notch without the air plugs so they did help to richen it up. I have the mix screws out 2 3/4turns i believe the # on the pilot jets were 170 if I take those plugs out i'm gonna have to richen it up. What way do the # run on the pilots? Thanks again Dan
Click to expand...
Still, quite a jump in mains.
If 1/3 throttle says rich plugs, then lower the jet needles accordingly.
With pilot jets, the larger the number, the larger the jet...same as the mains.
 
On my 80 1100 (sixteen valve) I run the Dynojet stage 3. I use the 138 main. The needle 2.5 notches from the botom (.5 using shim washer).
needle.jpg


Did you drill out the diaphragm slide?
 
Ok I went back to the 138 and got full rpm's out of her,had clip in 4th notch pulled strong 1/4 ,1/2 and full throttle.The only difference between this set up and when I first started is I left the air correction plugs in. (I had never used them previously) Got back in the garage pulled the plugs and the ceramic is black down in the plug but right at the tip where the electrode comes out it's pure white and the strap is clean. I'm thinking I need a little bigger main jet. I left the mixture screws alone set at 2 3/4 turns out. I think i'll go to the 250 mark on the mains. When I first ran the 138 without the corrector plugs the entire plug ran clean. By the way chef I did drill that out. Thanks for the input Dan
 
Get a set of 47.5 pilot jets. If you are still lean put the jet needle on the second notch from the bottom. Leave the main jet alone.
 
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