| Author | Message | ||
     Mtkawboy |
My 95 S2, stock except for a rejetted carb {45/195}and a Supertrapp muffler keeps idling higher as the bike heats up, ending up around 1500 or so. It also sometimes coughs as you take off hard. I put a new carb manifold rubber in it when I had the carb off but Im thinking maybe an air leak where the manifold bolts on the heads, Am I on the right track or what ? Its Ok under normal takeoffs. Thanks for any replys | ||
| Beardo |
Intake seals. That's the first place I would go. | ||
| Alfau |
Cough through carbie indicates a lean fuel condition. Could be leaking seals the jetting or fuel mixture setting. With the motor up to operating temperature, set the idle to 900-950 rpm,(Slow idle) then wind the mixture screw in slowly until the exact point where the motor starts to struggle/ stall.(you might have to do this a few times to establish the precise point) then wind it out exactly 1/2 a turn, set the idle and then do it all again. | ||
| Mtkawboy |
If I set the idle hot then its not going to idle at all cold is it ? I think Ill just go ahead with the intake seals then set the idle like that. I appreciate the help. | ||
| Alfau |
If you set the idle hot and did nothing else then you would be correct. Have fun. | ||
| Ratbuell |
Set the idle hot. Cold idle is what that knob labeled "CHOKE" is for over there by the key. | ||
| Mtkawboy |
Thank you for the helpful information on what the choke is for, Ill just ride around with it on until the engine gets hot. BS like that is why this forum is dying out. It always amazes me how smartasses can hide behind a computer & say things they wouldnt have the stones to say to my face. To ALFAU thanks for your help. | ||
| Ratbuell |
Actually...I'm a chronic smartass and willing to bet I would say it to your face. You just can't see my •••••••••• grin on a message board as I type it like you'd be able to see in person. Relax. (Message edited by ratbuell on June 11, 2013) | ||
| Hootowl |
I have my idle set hot, and it won't idle when it's cold without the choke (enrichener, actually) on. So I ride around with it on until it gets hot. Smart ass answer or not, it is the right one. I hope you get your issue resolved. | ||
| Beardo |
And that's what leads me to believe there is an intake leak. Choke is not normally needed for anything other than starting the bike. Maybe 'about' twenty seconds when cold out. You'll hear the idle pitch change. I think far too many people don't realize that those intake seals need changed out more often than they do. But, that's just my take. | ||
| Hootowl |
In my case, you're probably right, since I have no idea whether they've ever been changed, but it doesn't have any of the other symptoms of an intake seal leak. I don't have to have it on much after starting. Just a tiny bit until I have ridden about a mile. | ||
| Hootowl |
A mile in Houston in the summer is hot  | ||
| Alfau |
Could be leaking seals the jetting or fuel mixture setting. Could also air filter problems chocking the system. Over revving soon oils up the air filter. With ECMSpy hooked up to Fi bikes you can see how long it takes to get up to running temperature; normally about 5 minutes here in the subtropics so god knows how long it would take there in the tundra. Spray some carbie cleaner on the manifold seals to detect any leaks; being careful not to spray the intake area. | ||
| Mtkawboy |
Im going to change the intake seals & go from there. You might say it to my face but only once. Thanks to all the others for your help, Im done | ||
| Dave_02_1200 |
My 2002 M2 idles a bit faster when completely warmed up but I think that is not a bad thing because a slightly faster idle keeps the oil pressure up when the oil gets hot and thin. Cold idle is just over 1,000 and hot idle is close to 1,500. | ||
| Rubbinisracin |
The choke argument is interesting because I remember seeing in the manual something about riding the bike for the first few miles with the choke half out. Struck me as odd, so I can see where Mtkawboy thought that was strange but the manual tends to support what Ratbuell was saying. | ||
| Screamer |
While replacing the intake seals, check the line that goes from the manifold to the vacuum advance switch. They sometimes get brittle and may crack and leak or simply no longer seal - causing a high or floating idle. | ||
| Mtkawboy |
Will do, thanks. Have you ever tried explaining to a woman at the parts counter that a Buell is a Harley Sportster engine as far as 95 intake seals go ? We dont carry any Buell parts any more | ||
| Stev0 |
LOL. Yeah, you need to just take the part number in to them.. Easier to explain.. Just to add a little to this thread. You're lean, maybe because of an intake seal issue but more likely not. Your choke SHOULD be required for cold start and should be pushed in progressively as the motor warms up to temperature. The air fuel ratio required cold is about 6:1 whereas at operating temperature idle is about 11:1. If you set your idle circuit so rich that you don't need your choke then you're too rich.. simple. stevo | ||
| Beardo |
To keep it simple for the parts guy that doesn't know any better, always ask for those parts, when it comes to all motor parts, in the corresponding year Sportster. We all know gaskets, seals and such are the same, but because HD has pounded it into the minds of the dealers that Buell never existed, it's just easier that way. | ||
| Mtkawboy |
I appreciate all the advice guys & please dont take this wrong, but Ive been riding and wrenching on bikes for 55 years and currently own 12 of them. I know how the choke works and when its needed, I was just asking mainly about the intake leak which is there because I sprayed carb cleaner on the intake ends yesterday and the idle picked way up. Thanks again though for all the advice. I try & help anyone I can | ||
| Stev0 |
The problem with a board such as this is that it's difficult to be specific by remote. If a customer walks in to my workshop, I either know them and their bike's history or can get there quickly with a few questions. Here one has to give more of a blanket answer until it's narrowed down by information or data given back. Since the idle picked up with the carb cleaner trick then, yes, you've got an air leak in the intake. 12 is a good round number, although a Bakers dozen would be better, always room for one more.. LOL | ||
| Essmjay |
Besides, it not a choke, its an enrichner. Chokes cut the air to richen the mix, ours just adds more fuel. Same effect, different means. | ||
| Ratbuell |
...yeah, but the knob says "CHOKE". Functionally, you're 100% correct. "enrichner" is just too many letters to fit on the knob lol. | ||
| Mtkawboy |
Whatever it says its fixed now & runs like it should with out keeping the choke on until it warms up. Thanks for the help. Sorry for getting a little warm there, when I ask for help I really dont need a comedian, enough of them are already out of work. This isnt my first hay ride either. It was what I thought it was in the beginning. Thanks to Superman who put locktite on the intake manifold allen head bolts too & tightened them until they nearly broke off. Yes I have the Yost tool also | ||
| Hootowl |
Great news. Thanks for closing the loop. |
