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Help FCR idle trouble
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Topic: Help FCR idle trouble (Read 3791 times)
Some Dude
Full Member
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Posts: 171
Help FCR idle trouble
«
on:
July 15, 2008, 06:01:55 PM »
I can't seem to get my fcr 41's to idle. Should I be able to do this with just the fuel mixture screw & air screw? I've tried adjusting both but the bike won't idle unless I open the fast idle screw about 5 turns. I've tried 55 and 60 slow jets, both with the same results. my engine mods are listed in my signature, along with pod filters and sil conical exhaust. I also have pederzini 1.1 ign modules. I bought these carbs used they are synched and the floats are adjusted to 9mm. Is there somehing i'm missing?
here's what i have in the fcr's now.
slow jet 60
slow air jet 60
main jet 160
main air jet 200
needle EMT
clip 3rd from top
Thanks
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Bike Info
99 m900s Sbk forks
41mm FCR's
Dyna coils
944 hi comp pistons
heads ported and polished
larger valves
new valves and cams
aluminum fly wheel & clutch basket
[
Howie
Post Whore
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Re: Help FCR idle trouble
«
Reply #1 on:
July 15, 2008, 06:36:16 PM »
Fast idle screw?
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Some Dude
Full Member
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Posts: 171
Re: Help FCR idle trouble
«
Reply #2 on:
July 15, 2008, 07:07:41 PM »
Quote from: howie on July 15, 2008, 06:36:16 PM
Fast idle screw?
Mabye it's the choke, it's the screw on the side that opens the slides just a little bit
Logged
Bike Info
99 m900s Sbk forks
41mm FCR's
Dyna coils
944 hi comp pistons
heads ported and polished
larger valves
new valves and cams
aluminum fly wheel & clutch basket
[
knightrider
Sr. Member
Offline
Posts: 259
Re: Help FCR idle trouble
«
Reply #3 on:
July 15, 2008, 07:14:42 PM »
um, there is no choke. approx. how open are the slides at idle? maybe you just need to open em up a tad. turn the little plastic knob on the left side, my slides are open a couple mm i would say without accually going out and looking.
«
Last Edit: July 15, 2008, 07:19:26 PM by knightrider
»
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1994 M900
Some Dude
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Posts: 171
Re: Help FCR idle trouble
«
Reply #4 on:
July 15, 2008, 07:23:04 PM »
Quote from: knightrider on July 15, 2008, 07:14:42 PM
um, there is no choke. approx. how open are the slides at idle? maybe you just need to open em up a tad. turn the little plastic knob on the left side, my slides are open a couple mm i would say without accually going out and looking.
that's the one i'm talking about i've been riding with it that way for a couple months but, i figured when it was properly jetted that would remain closed.
Logged
Bike Info
99 m900s Sbk forks
41mm FCR's
Dyna coils
944 hi comp pistons
heads ported and polished
larger valves
new valves and cams
aluminum fly wheel & clutch basket
[
knightrider
Sr. Member
Offline
Posts: 259
Re: Help FCR idle trouble
«
Reply #5 on:
July 15, 2008, 07:36:28 PM »
no that is your idle adjustment. its mostly a set and forget item, unless you need to adjust it for an extremely cold startup, i myself never touch it and never have had a problem starting my bike cold, but i live in socal so it doesnt exactly get cold here.
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1994 M900
printman
Sr. Member
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Posts: 337
Check out my a.....
Re: Help FCR idle trouble
«
Reply #6 on:
July 16, 2008, 02:44:07 AM »
Was having horrible times keeping mine idling,
The symptoms were, it would idle way above the setting like stuck in advance ignition ( 1800 )
then would drop to below the setting, if it wasn't given throttle it would die
An extreme rich condition will give lean symptoms. look for the dropping in idle
a lean condition will surge upwards most times
A 60 slow maybe to rich and a 55 maybe to lean, I'm running a 58 with one turnout on
and 5 down on the needle. When playing with the ignition timing it made differences in the ways the fuel settings were set, more fuel here, less there.
With the 944 kit, check your ignition timing, may need to be less advanced with the high comps, I'm at 4deg BTDC
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I'll update this later at a convenient time Thank you for tuning in.....
akmnstr
What a Handsome
Hero Member
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Posts: 1243
The Puppy Killer
Re: Help FCR idle trouble
«
Reply #7 on:
July 16, 2008, 08:48:30 AM »
I'm having a similar problem. The engine will not immediately come down to idle. I have fiddled with the adjustments and found the best settings but still not working properly. I have torn apart my carbs and cleaned them, and changed the slow fuel jet. Checked for vacuum leaks, negative results. Tomorrow I'll check the slides to see if they are in synchronized. There is not much left to do except tear my hair out. I'll keep watching this thread to see if there are other ideas.
Could these problems be the result of worn valve guides?
One suggestion that I was offered was the weak stock coils, but some dude has aftermarket coils.
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"you may all go to hell, and I will go to Texas!!" Davey Crockett & AKmnstr
"An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men."
Charles Darwin
"I don't know what people expect when they meet me. They seem to be afraid that I'm going to piss in the potted palm and slap them on the ass." Marlon Brando
Speeddog
West Valley Flatlander
Flounder-Administrator
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RIP Nicky
Re: Help FCR idle trouble
«
Reply #8 on:
July 16, 2008, 11:20:05 AM »
Quote from: akmnstr on July 16, 2008, 08:48:30 AM
I'm having a similar problem. The engine will not immediately come down to idle. I have fiddled with the adjustments and found the best settings but still not working properly. I have torn apart my carbs and cleaned them, and changed the slow fuel jet. Checked for vacuum leaks, negative results. Tomorrow I'll check the slides to see if they are in synchronized. There is not much left to do except tear my hair out. I'll keep watching this thread to see if there are other ideas.
Could these problems be the result of worn valve guides?
One suggestion that I was offered was the weak stock coils, but some dude has aftermarket coils.
Sync 'em, that's probably the issue.
Someone posted up a link to a cheapo DIY manometer a little while ago.
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oppet
New Member
Offline
Posts: 35
Re: Help FCR idle trouble
«
Reply #9 on:
July 16, 2008, 12:10:47 PM »
Fcrs are straight pull carbs, you cannot sync them with vacuum.
Heres good one
http://www.factorypro.com/tech/carbkei.html
Edit.. I had also this flying idle when stopping on lights, it hanged while then settled down.
Chanced slow jet from 62 to 60 and now its stable.
«
Last Edit: July 16, 2008, 12:14:42 PM by oppet
»
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akmnstr
What a Handsome
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Posts: 1243
The Puppy Killer
Re: Help FCR idle trouble
«
Reply #10 on:
July 16, 2008, 03:02:23 PM »
Quote from: oppet on July 16, 2008, 12:10:47 PM
Fcrs are straight pull carbs, you cannot sync them with vacuum.
Heres good one
http://www.factorypro.com/tech/carbkei.html
Edit.. I had also this flying idle when stopping on lights, it hanged while then settled down.
Chanced slow jet from 62 to 60 and now its stable.
Thanks, I've had that guide to tuning FCRs in a binder for years. Good stuff in there. I've also had this problem for years and
will do the drill bit synchronization. There is not much left to try except
Logged
"you may all go to hell, and I will go to Texas!!" Davey Crockett & AKmnstr
"An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men."
Charles Darwin
"I don't know what people expect when they meet me. They seem to be afraid that I'm going to piss in the potted palm and slap them on the ass." Marlon Brando
dlearl476
Hero Member
Offline
Posts: 683
Re: Help FCR idle trouble
«
Reply #11 on:
July 18, 2008, 11:05:35 AM »
Quote from: Some Dude on July 15, 2008, 06:01:55 PM
I can't seem to get my fcr 41's to idle. Should I be able to do this with just the fuel mixture screw & air screw? I've tried adjusting both but the bike won't idle unless I open the fast idle screw about 5 turns.
Are you confident in the state of tune the motor's in? I ask because I just installed 41's on my otherwise stock motor (so my jetting won't be any help to you) and I had the idle screw almost all the way in in order to get a decent idle. I went out of town a couple of weeks ago so I thought I'd take the opportunity to drop the bike off and have the valves adjusted and belt tension checked and when I got the bike bike once it warmed up it was idling very high and took a LONG time to return to 1K. I backed the idle screw down and it's running great now.
Moral of the story: first, I don't think it's neccesarily bad if your idle screw is turned in 5 turns, if the bike is running properly and second, the adjustment of the valves may be playing a part if you don't know their in spec.
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Some Dude
Full Member
Offline
Posts: 171
Re: Help FCR idle trouble
«
Reply #12 on:
July 18, 2008, 01:00:47 PM »
I actually have the idle thing figured out and it was running very well until yesterday morning, when I went to start it and there was no spark in the vertical cylinder. Last night after work I checked a few things and found out, now I have a bad ignition module.
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Bike Info
99 m900s Sbk forks
41mm FCR's
Dyna coils
944 hi comp pistons
heads ported and polished
larger valves
new valves and cams
aluminum fly wheel & clutch basket
[
dlearl476
Hero Member
Offline
Posts: 683
Re: Help FCR idle trouble
«
Reply #13 on:
July 18, 2008, 01:22:03 PM »
Quote from: Some Dude on July 18, 2008, 01:00:47 PM
Dude, that sucks. Do you know why?
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Some Dude
Full Member
Offline
Posts: 171
Re: Help FCR idle trouble
«
Reply #14 on:
July 18, 2008, 04:57:54 PM »
I'm not sure why When I shut it off the other night I heard a pop and I didn't think much of it, but now i think it might have been an electrocal problem of some sort.
Logged
Bike Info
99 m900s Sbk forks
41mm FCR's
Dyna coils
944 hi comp pistons
heads ported and polished
larger valves
new valves and cams
aluminum fly wheel & clutch basket
[
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