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Buell Forum » Old School Buell » Archive through September 01, 2017 » 99 X1 missfire between 4000-5000 RPM « Previous Next »

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Moto619
Posted on Thursday, June 15, 2017 - 06:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Looking for help diagnosing this problem. I had this same hesitation / misfire problem in the past. The bike runs ok until about 4000 RPM it then hesitates misfires and then runs ok above 5000 RPM. I bought a race ECU (used) which took care of the problem for a few weeks then the problem returned. There are no error codes. I changed the head temp sensor no effect. Any ideas where to look next?
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Harleyelf
Posted on Thursday, June 15, 2017 - 11:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Cam Position Sensor. Take the timing cover off and smell it.
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Alfau
Posted on Friday, June 16, 2017 - 03:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

DDFI learns. It could be the way you ride the bike.
learn how here.
application/pdf
Buell DDFI training program.pdf (174.4 k)


(Message edited by alfau on June 16, 2017)
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Alfau
Posted on Friday, June 16, 2017 - 04:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)





this bit.

Note:- The bike misses, hiccups during transition from open loop to closed loop.

Might not be what your on about but worth knowing anyway.
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Moto619
Posted on Friday, June 16, 2017 - 04:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I rode it a little bit and took the timing cover off and no smell. I noticed that you bought a drag specialties CPS would you recommend that and do they still make them for that bike?
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Steveford
Posted on Friday, June 16, 2017 - 09:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Drag Specialties stuff is garbage from China.
What's the O2 sensor doing when the bike is hot? The voltage should be jumping around like crazy: high/low, high/low, etc.
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Hootowl
Posted on Monday, June 19, 2017 - 02:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Measure the voltage from the TPS, or disconnect the leads and measure resistance, as you roll on the throttle. Watch for areas that are not linear.
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Harleyelf
Posted on Tuesday, June 20, 2017 - 11:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I use the Sportster CPS because I put a carburetor on my bike. Can't speak to the quality of the Drag Specialties DDFI sensor.
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Williamscottrobertson
Posted on Tuesday, June 20, 2017 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I just put my DS cam sensor on. It's about 3 inches shorter than the original. Required some creative re-routing. I think it would have been nearly impossible to get it back under the starter as before anyway. It barely came out.

My stock one fell apart on removal. Corroded at the terminals. I marked the lines on the stock one to the timing cup and lines of the DS version. Put the new one in the same spot and it fired right up.

I pulled the spark plugs and put my finger over the hole waiting for compression. Then found the timing mark in the window. I tried with the switch and kill on and couldn't hear the fuel pump, even if I moved the rear wheel back and forth. I guess I'll try to figure the breakout box thing to make sure it's timed
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Natexlh1000
Posted on Wednesday, June 21, 2017 - 10:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Can't you just use a timing light like the old days?
Or are these newfangled things only static timed?
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Harleyelf
Posted on Wednesday, June 21, 2017 - 11:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Timing light will work but will also spew oil all over unless you get a lucite plug for the hole.
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Williamscottrobertson
Posted on Wednesday, June 21, 2017 - 12:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah I may buy a view plug and do a running check just for my piece of mind.
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Zac4mac
Posted on Saturday, June 24, 2017 - 12:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Most of the ignitions I've seen start with a static time.
I tried a lucite plug on my ironhead 30 years ago and only saw oil when running. marks? timing? really?

I always static-timed then ran it to dial in the advance to just below detonation clatter.

Z
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Alfau
Posted on Saturday, June 24, 2017 - 05:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thgat makes sense, to a galoot!
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Harleyelf
Posted on Sunday, June 25, 2017 - 01:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If the lucite plug gets covered in oil, don't screw it in quite so far. I've set mine without the plug - the trick is to get it done quickly - then clean up the oil from the timing light and your face.
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Williamscottrobertson
Posted on Friday, June 30, 2017 - 09:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Bought a drag specialties timing plug for $5 from the local HD dealer. The timing mark was almost out of view to the rear of the bike (I think that's the advanced direction). Ran it about 100 miles like that, it would hesitate and ran warmer it seemed, would surge at idle when really hot. The idle smoothed out when I got the mark centered. Hopefully this fixes the surging and hesitations that weren't there before. Hard starts seem to be gone and random misses seem to be gone also.

(Message edited by Williamscottrobertson on June 30, 2017)
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