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big poppa pump
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« on: August 02, 2016, 02:43:55 PM » |
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Out of curiosity, I am interested in knowing from other members who have upgraded to bigger main jets.
Does it make sense to go with 105 main jets on the following setup:
- Cobra pipes (no baffles), slashcut 12 inches.
- 38 slow jets, 100 main jets, 2 turns on the a/f screws.
- dynojet needles on 3rd notch.
- K&N air filter, no pre-filter
- IS ICM and IS carb springs.
- ECT Mod.
- Desmogged
Absolutely no popping or backfiring at any RPM's. Haven't experienced any flat spots at all, except around the 90-95 mph I kinda get a feeling that something is amiss.
Appreciate all your input.
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VRCC#35870 VRCCDS#0266 1998 Valkyrie Hot Rod  |
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Robert
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« Reply #1 on: August 02, 2016, 04:15:05 PM » |
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I have 110's and would have gone to 115 or 120 but it was much better than stock and I didn't want to put in the effort. I have done a airbox mod which involves taking out the base plate on the Intake. The Dyno jet needles, I dont have to much experience with but some jet kits make it too rich at the mid throttle and do nothing for top end.
I leaned out mid range which is cruising and went richer on top which you are never in unless you are on it. This way you get the best mileage and the best top end you can get. I think Black Duck went to 125's on his. Simple needles does not qualify for a jet kit in my book. It takes all the jets to really set these up correctly. Like the 38's at idle should be included along with top end jets. I dont remember the kit I used but it included all this and a bit more. If you are interested I will look for the name.
Wanted to add this I did this because at wide open I felt there was something more available, especially when I hit 3/4 throttle and it seemed almost stronger.
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« Last Edit: August 02, 2016, 04:25:15 PM by Robert »
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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98valk
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« Reply #2 on: August 02, 2016, 04:55:17 PM » |
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I just posted my dyno run with 4 gas.
I had 120s and it was pig rich off the scale at 14 CO.
I have major air box mods and viking exhaust.
The operator a former NHRA drag racing champion said I was losing at least 10 HP being that rich and due to it being a big engine will tend to tolerate rich jetting by not falling on its face.
put 112s in and runs much much better.
after I put my ported heads with the R1 cams on it will be back on the dyno.
these bikes don't need big jets.
I just recently posted jetting and tuning of cobra pipes by FactoryPro.
if u don't have air box mods the MJs are fine.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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big poppa pump
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« Reply #3 on: August 02, 2016, 05:09:49 PM » |
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I don't plan on doing any mods to the airbox.
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VRCC#35870 VRCCDS#0266 1998 Valkyrie Hot Rod |
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98valk
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« Reply #4 on: August 02, 2016, 05:53:24 PM » |
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I don't plan on doing any mods to the airbox.
follow the factory pro tuning instructions, run it in 3rd gear on the street, u will know if it needs more or less. |
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Logged
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Bighead
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« Reply #5 on: August 02, 2016, 05:56:59 PM » |
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How about just keeping it below 95  |
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1997 Bumble Bee
1999 Interstate (sold)
2016 Wing
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big poppa pump
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« Reply #6 on: August 02, 2016, 06:10:52 PM » |
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I don't plan on doing any mods to the airbox.
follow the factory pro tuning instructions, run it in 3rd gear on the street, u will know if it needs more or less. Got a link to the factory pro instructions? Thanks. |
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VRCC#35870 VRCCDS#0266 1998 Valkyrie Hot Rod |
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98valk
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« Reply #7 on: August 02, 2016, 06:18:06 PM » |
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I don't plan on doing any mods to the airbox.
follow the factory pro tuning instructions, run it in 3rd gear on the street, u will know if it needs more or less. Got a link to the factory pro instructions? Thanks. they don't allow u to link, need permission. just go to the tech section, u will see it and much more. just use the low rpm instructions. |
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Logged
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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big poppa pump
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« Reply #8 on: August 02, 2016, 07:06:14 PM » |
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I don't plan on doing any mods to the airbox.
Found it. Thanks. follow the factory pro tuning instructions, run it in 3rd gear on the street, u will know if it needs more or less. Got a link to the factory pro instructions? Thanks. they don't allow u to link, need permission. just go to the tech section, u will see it and much more. just use the low rpm instructions. |
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VRCC#35870 VRCCDS#0266 1998 Valkyrie Hot Rod |
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Ricky-D
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« Reply #9 on: August 03, 2016, 10:35:52 AM » |
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If you are really looking for improvement, the best modification would be all stock configuration, and Dial-A-Jet kits on each carburetor. Results that would be noticeably improved.
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2000_Valkyrie_Interstate
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Robert
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« Reply #10 on: August 03, 2016, 03:49:59 PM » |
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The Factory Pro is the way to go and what I have in mine also. http://www.factorypro.com/ |
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« Last Edit: August 03, 2016, 03:53:56 PM by Robert »
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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98valk
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« Reply #11 on: August 03, 2016, 04:42:07 PM » |
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If you are really looking for improvement, the best modification would be all stock configuration, and Dial-A-Jet kits on each carburetor. Results that would be noticeably improved.
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first thing I ever did. I was the first buyer for a valkyrie. |
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Logged
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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big poppa pump
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« Reply #12 on: August 03, 2016, 07:42:03 PM » |
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Ordered the factory pro kit. Will start tinkering around with the carbs next weekend. Thanks ya'll.
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VRCC#35870 VRCCDS#0266 1998 Valkyrie Hot Rod |
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