| Author | Message | ||
     Crip2nite |
Sometimes my bike wont start up right away(I probably don't hold the switch long enough), On the second try,though, a loud backfire is heard! Does that mean I might have turned the throttle and Let some gas in?? And does a sudden backfire do any damage?? | ||
| Glitch |
Means you shoulda bought a nine  Do you mean a cold start, or a warm start. Are you twisting the throttle (you shouldn't be) while you are trying to start it? Are you waiting for the engine light to go out before attempting to start? Does that mean I might have turned the throttle and Let some gas in?? Could be. And does a sudden backfire do any damage?? Probably not, but I wouldn't make a habit of it. How many miles are on the bike, if it's close to a service, have 'em check the timing. When you say "sometimes" are you saying once a day, once a week, every other time...? | ||
| Crip2nite |
haha... 1:Cold Start 2:Think I twisted it this time 3:Yes.Waiting for engine light to go out 4:2,326 miles on bike 5:This is the 2nd time it happened 6:Seriously considering a 9 as a 2nd bike  | ||
| Glitch |
I don't think you have anything to worry about. Just don't twist the throttle when starting. 2,326 miles, it ain't even close to bein' broken in. It gets better after 7000 or so miles. | ||
| Crip2nite |
Thanks......Bike is running great otherwise!! | ||
| Xb9er |
If you think your problem happens because you're not holding in the starter button long enough, try turning the ignition key to off, wait a second, turn it back to start, then push the starter again. I have no clue if that will work or not, but it is worth a try. Mike. | ||
| Odie |
When you twist the throttle you do absolutely nothing except open up the butterfly in the throttle-body which would let more air into the intake tract if it was running.The TPS exists so the ECM can govern how fuel needs to added to the mix based on the amount of air being let in via your wrist. NO fuel is going into the intake tract. That's the job of the injectors .............. | ||
| Darthane |
Odie, it's true when the bike is off that it's not doing anything, but when you give it gas during startup, it's behaving no differently than a carbureted bike would. Once the ECM has power, it sees open throttle, and it's commanding the injectors to supply fuel based on that. Just in general, for FI anything you should NOT be on the throttle during start-up. | ||
| Odie |
That's what I said............ | ||
| Starter |
Ummmmm, the ECM comes complete with a cold start routine you shouldn't need to help it. I'll explain it (assuming your bike is in neutral), insert and turn key to ON position, turn kill switch to ON, wait for engine light to go out, press starter for approx 2 sec (BTW Your involvement stops here!) bike starts, idle goes to 1050rpm and bike warms up (at this point you may want to gaurd the throttle so the monkey riding a sewing machine doesn't continualy blip the throttle for aural pleasure). There is no mention of twisting throttle. Keep it that way. If your bike don't want to play ball take it to the dealer and tell them to fix it. (Message edited by starter on September 02, 2004) | ||
| Nedwreck |
Ahhh, I remember when my S3T would do that. I had a Thunderslide and a V&H on it. It did it so regularly that I named the bike "Boom". Bob | ||
| Crip2nite |
Bike is set by H-D to Idle at about 950.... | ||
| Starter |
Don't let the 950rpm idle worry you as the tacho is likely to be a little inaccurate. Hence why most service manuals recommend the connection of a calibrated tacho unit for setting the idle (the digital tech may even have this function, I dunno). If you are following the start up procedure from your handbook and the bike is backfiring take it to the dealer and ask them to explain it. | ||
| Yellow_xb |
My XB9 has back-fired a couple of times before while starting, but I think it was because I did not hold the starter long enough and then hit it again. Also it has "back-fired" through the intake, and then coughed and stumbled more than a few times, especially when getting back on the gas after letting off at lower rpms (such as going around a corner), or when stopping hard and then taking off again. I took it to the dealer and they said it was most likely a "lean pop" caused by the extra lean setting of the factory ecm. They suggested the race ecm to correct this. I don't think this is right and the race ecm is pricey. An XB12 airbox lid has helped the situation but not fixed it. Has anyone else had this problem? | ||
| Slowby |
did they check the timing on set up? if you twist the throttle while the eng light is on it may disrupt the parameter reading the ecm is doing. |
