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Timing the SEM Unit '95 FE501

Joined Dec 2004
1 Posts | 0+
Unknown
I recently took in an orphan FE-501. The ignition was cooked, so I ordered a new SEM unit complete with flywheel.

After piecing together what info is there for pre-99 stuff, all I know is the timing is to be set at 35BTC, but in typical European fashion, how to do this is not described. I cannot determine any significant marks that stand out for timing purposes. Strobe timing doesn't yield any relative marks.

Before I get out the degree wheel, make a piston stop and degree the crank myself so I can align the pin hole with the notch in the pick up unit, is there an easier way to do this?? You'd think the nice Swedish farmboy who put this together would have been nice enough to chisel a timing mark after he spent 40 minutes bench timing it.

Kris The 'Berg Virgin.
 
The easy way: turn the stator max clockwise

The right way: there is 2 marks on the flywheel, the first i the timning mark and the second is tdc. And there is a mark in the engine block.
Turn the flywheel so the ign. mark match to the mark in the block. There is a little hole i the flywheel, and a hole in the stator. Take a nail or something so you can feel trough the flywheel if the stator is in the right pos

/farmboy from sweden :D
 
timing sem unit

Hi, turniprider...
I just sent this to another rider with the same question.
1 : Piston comes to TDC on 2 occasions - compression and exhaust, but you can not adjust the valves or auto-decomp correctly if at TDC exhaust . The only way I have been able to make sure motor is at TDC compression is to remove valve adjustment covers, spark plug, and ignition cover, and turn motor over slowly with wrench on flywheel nut until both intake and exhaust rockers are loose and piston is at TDC(screwdriver in sparkplug hole method ok).
2 : There are 2 small arrowheads on the flywheel on my '98 fc, and a small scribe mark on the edge of the case where the ignition cover fits. The two arrowheads are on the very edge of the flywheel, and are 33 deg. apart. Turning flywheel clockwise, first mark is the 33 deg. BTDC ignition mark where the sparkplug fires, and next mark is the piston TDC mark, where both intake and exhaust valve rockers are loose, and all valves should be closed. The measured linear distance around the edge of the flywheel between these two marks is 33.6mm. This position (piston TDC) is where the auto-decomp should be adjusted for the 2mm+/-1mm decomp arm slack setting.
3 : The pinhole in the flywheel is approximately opposite the 33 deg. BTDC mark on the flywheel, and with the pin in the hole, gently rocking the flywheel back and forth should allow the pin to drop into the small slot in the stator, if the stator has not come loose and moved. The only way to really check that is to remove the flywheel.
All this being said, if the ignition or flywheel have been changed, the procedure also changes, as apparently the replacement flywheel may not have timing marks on it, and you may have to go to piston TDC, back up 33 deg.(33.6mm), mark both points on the flywheel, set the ignition timing by removing the flywheel, loosening the stator slightly, sliding the flywheel gently back on, and putting the pin in the hole and stator slot, and rotate gently until 33 deg. BTDC mark is aligned with case mark, gently remove flywheel, and tighten stator screws.
4 : The workshop manual says reassemble, then check with a timing light at 5000 rpm.
Check our downloads section, there may be a '99 or earlier workshop manual in there.
If worst comes to worst, I can try to scan both workshop manual pages, and the owners manual page regarding this procedure. My scanner normally uses bitmap (.bmp) formatting, and some files tend to be a bit large.
Send me a pm if you want me to try the scan.
 

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