rxrider said:My idle AFR is a bit low, like in the 12s at idle on a warm engine.
I have 22.5 pilots in and pilot screws at 2 turns out. How much should I turn the pilots in to get the AFRs closer?
No snow to ride on so I have not been able to test properly. Will try to get out on the lake this weekend to test jetting and clutching.
I think there is a company in Canada that makes gauge pods for the RX1?
rxrider
Jan-Ove Pedersen
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Thanks lakercr
Yeah I know - I have the pod and hood scope for the IC on my plan when budget allows. I have a water temp gauge and sensor waiting to be installed and need the inhose tube to attach the sensor to. Do you supply Ulmerracing, I think I found the parts there.
Yeah I know - I have the pod and hood scope for the IC on my plan when budget allows. I have a water temp gauge and sensor waiting to be installed and need the inhose tube to attach the sensor to. Do you supply Ulmerracing, I think I found the parts there.
We suplpy Ulmer Racing with the plastics - Allen makes his own sensor adapters.
rxrider
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Thank you lakercr
Skydog
TY 4 Stroke God
Well i left the 17.5 in and put my needles back to stock i had them all the way up. I hope this makes a big dif from 4000-7000 rpm. Will put carbs on tomorrow night after work and let you guys know the out come.
Thank you Skydog
Thank you Skydog
rxrider
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I will go out tomorrow and adjust my pilot screws in a 1/2 turn. I'm now at 2 turns from seated, will go to 1.5 and see if I can get warm idle AFRs up from 12s to 14s.
Before going to 22.5 pilots AFRs was at 14.7-15.5 idle and 14.5 slow cruising. Throttle response down low was nothing to speak of, much better now with the 22.5 pilots even if it is too rich at 2 turns out.
Before going to 22.5 pilots AFRs was at 14.7-15.5 idle and 14.5 slow cruising. Throttle response down low was nothing to speak of, much better now with the 22.5 pilots even if it is too rich at 2 turns out.
Skydog
TY 4 Stroke God
Well put carbs back on with the 17.5 and 135mains 2.25 on the screws and put the needles back to the stock spot!!! WOW BINGO right on the money now!!!
THANK YOU GUYS Skydog
THANK YOU GUYS Skydog
rxrider
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Great to hear that Skydog.
I adjusted the pilot screws from 2 turns to 1.5 turns out, that did not do anything at all. Idle on a warm engine was still in the low 12s with outside temps at -8C or 17F. I even got into the high 11s after running my sled up and down my driveway.
I will go out tomorrow morning and change out the 22.5 pilots for the stock ones 17.5 pilots, will also go with 2.25 turns out on the pilot screws. I guess this will work just fine, last year the pilot circuitry were just a tad too lean, idle at 14.7 and dropping to 15.5 if left at idle for a minute or so. A 1/4 turn out on the pilot screws may be enough.
I adjusted the pilot screws from 2 turns to 1.5 turns out, that did not do anything at all. Idle on a warm engine was still in the low 12s with outside temps at -8C or 17F. I even got into the high 11s after running my sled up and down my driveway.
I will go out tomorrow morning and change out the 22.5 pilots for the stock ones 17.5 pilots, will also go with 2.25 turns out on the pilot screws. I guess this will work just fine, last year the pilot circuitry were just a tad too lean, idle at 14.7 and dropping to 15.5 if left at idle for a minute or so. A 1/4 turn out on the pilot screws may be enough.
Skydog
TY 4 Stroke God
Right on, alittle on the idle screws do a TON!!
Skydog
Skydog
rxrider
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Man I'm lazy. I did leave the 22.5 pilots in there, but I adjusted down the pilot screws to 1 turn out. Will start her up tomorrow to check if the idle AFR coming up some. If not the 22.5s are history.
Skydog
TY 4 Stroke God
ha ha Yea i HATE pulling carbs and the bowls off too!!
Skydog
Skydog
rxrider
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Skydog said:
I hate it too
but I wish I had not been that lazy 
Why? Read my next post
rxrider
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I trailered to the mountains this evening to ride my turbo for a few miles up the mountain to test my carb setup. Temps were -6C or 21F.
And the verdict is: 22.5 pilots jets DO NOT work in my sled. Period. They are so history.
At 1 turn out on the pilot screws, warm engine idle was 13.8-14.3, not bad at all. Steady throttle holding it at 4000 rpms, just below engagement, AFR was 13.5, perfect. Taking off driving around slowly on the lake AFRs was in the 12s, slowly giving it more throttle AFRs dropped into the high 11s with no boost. WOT AFR was in the low 10s.
What is happening? It seems to me adjusting down the pilot screws only affects idle to engagement rpms, which were acceptable. Riding it, it went way fat, not running clean at all. After giving it WOT to 16 lbs and let off abruptly, it would stall and die, I had to throttle it to keep it alive with AFRs at 10 or worse. If I understand the pilot circuitry correct, the pilot jets will feed fuel at all throttle positions, the whole range. It has to be that way, it was not that fat last season.
When home I took off the carbs and reinstalled the stock 17.5 pilot jets. I set the pilot screws at 2.25 turns out to give it a little more fuel down low. Last year running the 17.5 pilots jets and pilots screws 2 turns out I had a lean condition off idle, it would stumble and then recover from lack of fuel. I hope I get it right this time
I also removed the carb shut off valve. It did not do any good. Sled started to run funny going richer and richer on the WBO2 until carbs froze up, happened after 2 miles of rinding. Opening the valve fully the AFRs got back to normal in less than a minute. I don't mind holding the throttle open slightly when cranking it, but I do mind having the carbs freeze up and stall the sled from running pig rich killing plugs.
I found snow in the mountains to ride on, so I may go out later this week to test my latest carb setup
:exc:
Skydog - I wish I had changed out the jets the first time, guess it beeing lazy doesn't allways pay off 
And the verdict is: 22.5 pilots jets DO NOT work in my sled. Period. They are so history.
At 1 turn out on the pilot screws, warm engine idle was 13.8-14.3, not bad at all. Steady throttle holding it at 4000 rpms, just below engagement, AFR was 13.5, perfect. Taking off driving around slowly on the lake AFRs was in the 12s, slowly giving it more throttle AFRs dropped into the high 11s with no boost. WOT AFR was in the low 10s.
What is happening? It seems to me adjusting down the pilot screws only affects idle to engagement rpms, which were acceptable. Riding it, it went way fat, not running clean at all. After giving it WOT to 16 lbs and let off abruptly, it would stall and die, I had to throttle it to keep it alive with AFRs at 10 or worse. If I understand the pilot circuitry correct, the pilot jets will feed fuel at all throttle positions, the whole range. It has to be that way, it was not that fat last season.
When home I took off the carbs and reinstalled the stock 17.5 pilot jets. I set the pilot screws at 2.25 turns out to give it a little more fuel down low. Last year running the 17.5 pilots jets and pilots screws 2 turns out I had a lean condition off idle, it would stumble and then recover from lack of fuel. I hope I get it right this time
I also removed the carb shut off valve. It did not do any good. Sled started to run funny going richer and richer on the WBO2 until carbs froze up, happened after 2 miles of rinding. Opening the valve fully the AFRs got back to normal in less than a minute. I don't mind holding the throttle open slightly when cranking it, but I do mind having the carbs freeze up and stall the sled from running pig rich killing plugs.
I found snow in the mountains to ride on, so I may go out later this week to test my latest carb setup
:exc:Skydog - I wish I had changed out the jets the first time, guess it beeing lazy doesn't allways pay off
Skydog
TY 4 Stroke God
Yea buddy, you got her now!! I bet she will run GREAT!! I was starting to tune alittle to much from the Wide band. Yes it is a GREAT GREAT tool but some times a litttle lean on the wide band down low with no boost is just fine! The sled will let you know if she is to lean down low for sure with that snap sound back fire. If she runs great now and your wide band is good at wide open run her buddy!!
Funny thing with my carb shut off too, my sled EVERY time i turned the valve off my carbs would freeze. Sled would not idle and stall, taking mine off to. Mine starts the same way to a tee! Needs alittle gas to get boosting after she sits for about 15-30 mins that is fine with me too!! The cool part is frist thing in the morning very very cold out it starts better than my 07 Rtx!! HA HA Which starts GREAT!!! BOOST BOOST AWAY BUDDY!!
Skydog P.S. You have your stock carb springs in right?
Funny thing with my carb shut off too, my sled EVERY time i turned the valve off my carbs would freeze. Sled would not idle and stall, taking mine off to. Mine starts the same way to a tee! Needs alittle gas to get boosting after she sits for about 15-30 mins that is fine with me too!! The cool part is frist thing in the morning very very cold out it starts better than my 07 Rtx!! HA HA Which starts GREAT!!!
BOOST BOOST AWAY BUDDY!!Skydog P.S. You have your stock carb springs in right?
rxrider
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Stock carb springs, haha, you bet. Holtzmans springs DO NOT work in my sled either, now I have the stock springs in there lowered to the #2 position.
Current Jetting:
Main jets = 135
Pilot jets = 17.5
Pilot screws = 2.25 turns out
Needles = #2 position (lowered 1 position)
Stock carb springs
STM Billet Carb Caps
Will have to ride it to verify
I hope I'm close now, but my best guess is that I end up completely stock on the carb settings. If so that would be the first time I have run it with the stock carb settings. I wish I had listened to Erik at MCXpress, he said it was not necessary to rejet the carbs running his turbo kit.
Current Jetting:
Main jets = 135
Pilot jets = 17.5
Pilot screws = 2.25 turns out
Needles = #2 position (lowered 1 position)
Stock carb springs
STM Billet Carb Caps
Will have to ride it to verify
I hope I'm close now, but my best guess is that I end up completely stock on the carb settings. If so that would be the first time I have run it with the stock carb settings. I wish I had listened to Erik at MCXpress, he said it was not necessary to rejet the carbs running his turbo kit.
