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Author Topic: Pilot screw adjustment  (Read 1333 times)
dpcarson
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Posts: 405


Lillington, NC


« on: March 22, 2015, 10:50:44 AM »

OK, this question is basically leading back to trying to figure out this problem:
http://www.valkyrieforum.com/bbs/index.php/topic,76615.0.html

OK, when I took the carbs down on the bike, I cleaned the jets, put in new float valves, and pulled the pilot screws and replaced the springs and o-rings for the pilot screws.  When I was removing the pilot screws I made a not of the seat position of each screw.  They ranged from 2.25 to 3 turns out.  3 of them were at 2.5 turns.  Since I replaced the other components I put them back in at 2.5 turn out across the board.  Did I screw up here.  Should I have put them all back in at the exact same point that they came out?  Could that be leading to the issues from the post above?

Thanks.
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Glenn-B
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Posts: 23

Holmfirth - West Yorkshire - UK


« Reply #1 on: March 22, 2015, 12:51:49 PM »

I set mine up using an exhaust gas analyzer and ended up with them all set at 2.5 turns out from seated. It run absolutely perfect and is excellent on fuel MPG. So your in the correct ball park  cooldude
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ChaosMagnum
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Posts: 1


« Reply #2 on: July 07, 2015, 07:07:57 AM »

I set mine up using an exhaust gas analyzer and ended up with them all set at 2.5 turns out from seated. It run absolutely perfect and is excellent on fuel MPG. So your in the correct ball park  cooldude

I too just adjusted my pilot screws.  I made my own exhaust sniffer using a wideband o2 sensor and some exhaust piping.  I have the cobra exhaust and I just sniffed and adjusted each cylinder until I reached a 14.7ish a/f ratio.  Is this similar to what you did?  Adjusting to 14.7 I mean. 
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Patrick
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Posts: 15433


VRCC 4474

Largo Florida


« Reply #3 on: July 07, 2015, 10:59:09 AM »

OK, this question is basically leading back to trying to figure out this problem:
http://www.valkyrieforum.com/bbs/index.php/topic,76615.0.html

OK, when I took the carbs down on the bike, I cleaned the jets, put in new float valves, and pulled the pilot screws and replaced the springs and o-rings for the pilot screws.  When I was removing the pilot screws I made a not of the seat position of each screw.  They ranged from 2.25 to 3 turns out.  3 of them were at 2.5 turns.  Since I replaced the other components I put them back in at 2.5 turn out across the board.  Did I screw up here.  Should I have put them all back in at the exact same point that they came out?  Could that be leading to the issues from the post above?

Thanks.








Why the question ?  How does it run ?  I hope you cleaned the passages and not just replaced the jets.

I've set the pilots in about every method that can be thought of [ got the burnt fingers to prove it].  2.25 turns is about right, so, you should be fine. A quarter turn isn't going to mean much.
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Attic Rat
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Posts: 446


VRCC # 1962

Tulsa, OK


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« Reply #4 on: July 08, 2015, 05:30:53 AM »

I set them all on the bench at 2 1/4 out 2 1/2 seems to be a little too rich. I would roll them in 1/4 turn
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Pappy!
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Posts: 5710


Central Florida - Eustis


« Reply #5 on: July 08, 2015, 05:57:28 AM »

When you are looking at a 1/4 turn difference remember that the altitude above sea level, ambient air temperature, air density, fuel used, etc.  can make this much (1/4 turn) difference in what is perceived as perfect. Go with it.
« Last Edit: July 08, 2015, 06:05:55 AM by Pappy! » Logged
moodyvalk
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Posts: 150


SE Kansas, NE Oklahoma


« Reply #6 on: July 14, 2015, 06:15:50 AM »

OK, this question is basically leading back to trying to figure out this problem:
http://www.valkyrieforum.com/bbs/index.php/topic,76615.0.html

OK, when I took the carbs down on the bike, I cleaned the jets, put in new float valves, and pulled the pilot screws and replaced the springs and o-rings for the pilot screws.  When I was removing the pilot screws I made a not of the seat position of each screw.  They ranged from 2.25 to 3 turns out.  3 of them were at 2.5 turns.  Since I replaced the other components I put them back in at 2.5 turn out across the board.  Did I screw up here.  Should I have put them all back in at the exact same point that they came out?  Could that be leading to the issues from the post above?

Thanks.


the true answer to this question would have a lot to do with the altittude the bike will be drove at....i agree with attic rat that 2.25 turns at about sea level to 1000ft above.  and I know for a fact that @ 6500 ft of elevation 1.75 was perfect which would back up the service manual for .5 turn in at high elevation...
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