should I remove Thunderslide & DynoJet kit?
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
You bring up some interesting thoughts, so here is what I did and the interim results:
Swapped both jets for the larger and added 4 1mm washers to the needle to raise it. Did the garage test (raining, so not gonna ride) and the initial results were promising but not finished. Decel pop appears to be either eliminated or at the very least, attenuated. Hesitation on accel also appears diminished but really rough at the start of the throttle turn. Should have better weather tomorrow so I will road test then. NH, give me your thoughts on how a smaller pilot jet would eliminate the pops. I would truly like to know the physics behind it if able.
v.r
rj
Swapped both jets for the larger and added 4 1mm washers to the needle to raise it. Did the garage test (raining, so not gonna ride) and the initial results were promising but not finished. Decel pop appears to be either eliminated or at the very least, attenuated. Hesitation on accel also appears diminished but really rough at the start of the throttle turn. Should have better weather tomorrow so I will road test then. NH, give me your thoughts on how a smaller pilot jet would eliminate the pops. I would truly like to know the physics behind it if able.
v.r
rj
Since it controls throttle from 0 to 1/4 it's probably responsible for decel popping also. Usually stage 1 bikes run 45-46 pilot... only occasionally a 48. You make the fine adjustment with the adjustment screw.
The 46 pilot is not a stock HD part, but it's available from the aftermarket.
If it pops on decel the pilot (or adjustment) is probably on the lean side.
Backfiring is usually rich.
Needle controls throttle from 1/4 to 3/4. HD N65C needle is a good one to use P/N 27094-88. Not sure if it's still available (88 XL part).
Main Jet works from 3/4 to full throttle.
If at full throttle the engine runs ‘heavily’ the main jet is too large. If at full throttle, by slightly closing the throttle or air valve the engine seems to have better power, the main jet is too small.
I don't like the Dynojet kits. they run rich and economy usually suffers.
Keep in mind that the DJ jet calibrations are not the same as HD (Kehin). A DJ 190 main is not the same as a HD 190... they are different sizes.
By the way...I'm assuming you're talking about a TC88 as your header indicates a 2003 Wide Glide. This is an EVO forum, so I don't want to confuse anyone.
Last edited by nhrider1; Nov 16, 2013 at 03:31 PM.
Since it controls throttle from 0 to 1/4 it's probably responsible for decel popping also. Usually stage 1 bikes run 45-46 pilot... only occasionally a 48. You make the fine adjustment with the adjustment screw.
The 46 pilot is not a stock HD part, but it's available from the aftermarket.
The 46 pilot is not a stock HD part, but it's available from the aftermarket.
If it pops on decel the pilot (or adjustment) is probably on the lean side.
Backfiring is usually rich.
Needle controls throttle from 1/4 to 3/4. HD N65C needle is a good one to use P/N 27094-88. Not sure if it's still available (88 XL part).
Main Jet works from 3/4 to full throttle.
I don't like the Dynojet kits. they run rich and economy usually suffers.
Keep in mind that the DJ jet calibrations are not the same as HD (Kehin). A DJ 190 main is not the same as a HD 190... they are different sizes.
By the way...I'm assuming you're talking about a TC88 as your header indicates a 2003 Wide Glide. This is an EVO forum, so I don't want to confuse anyone.
Backfiring is usually rich.
Needle controls throttle from 1/4 to 3/4. HD N65C needle is a good one to use P/N 27094-88. Not sure if it's still available (88 XL part).
Main Jet works from 3/4 to full throttle.
If at full throttle the engine runs heavily the main jet is too large. If at full throttle, by slightly closing the throttle or air valve the engine seems to have better power, the main jet is too small.
I don't like the Dynojet kits. they run rich and economy usually suffers.
Keep in mind that the DJ jet calibrations are not the same as HD (Kehin). A DJ 190 main is not the same as a HD 190... they are different sizes.
By the way...I'm assuming you're talking about a TC88 as your header indicates a 2003 Wide Glide. This is an EVO forum, so I don't want to confuse anyone.
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