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#1025272 jd750ace (User) Front toward enemy Platinum Boarder Posts: 18763 Re:HELP...... one piston not firing 3 Months, 1 Week ago   If you have spark and it is not backfiring through the carb I’d say a stuck exhaust valve. The orange and gray wires that feed the coil have flag terminals on them. I had one contacting the carb cable bracket that shorted the feed to the coil once, so check good under there and make sure nothing is touching them. Mine had a tiny little hole in the cover on the flag terminal. It only made contact when the motor was vibrating.   Logged       The administrator has disabled public write access. #1025280 Flashback (Moderator) Just the facts, Ma'am.. Moderator Posts: 10749 Re:HELP...... one piston not firing 3 Months, 1 Week ago   Probably be a good idea to do a compression test...I'm going with the stuck valve........   Logged       The administrator has disabled public write access. #1025298 ctkog (User) Expert Boarder Posts: 523 Re:HELP...... one piston not firing 3 Months, 1 Week ago   +1 on the compression test like flashback said.. and if you do have svs one thing I've heard of is to shoot some penetrating oil on the valve stems thru the head ports. better yet if you can take the valve cover off let gravity draw it down between the guides.   Logged     ---------- NOTHING STRAIGHTENS MY HEAD OUT BETTER THAN AN ENTIRELY CROOKED ROAD-----------   The administrator has disabled public write access. #1025303 DaPreacha (User) Fresh Boarder Posts: 3 Re:HELP...... one piston not firing 3 Months, 1 Week ago   Had the exact same thing on my 2000 roadstar. It was a sticking valve. I just poured Seafoam into the intake slowly with the motor idling high then let it sit for about a half hour or so before cranking it up and blowing it out. Worked like a charm!   Logged     The administrator has disabled public write access. #1025313 jd750ace (User) Front toward enemy Platinum Boarder Posts: 18763 Re:HELP...... one piston not firing 3 Months, 1 Week ago   Marvel Mystery Oil is magic sauce for sticking valves on air cooled aircraft engines.   Logged       The administrator has disabled public write access. #1025357 masterhermit (User) Expert Boarder Posts: 583 Re:HELP...... one piston not firing 3 Months, 1 Week ago   hey all for the reps.... finally got around to my sons and we can safely say it not electrical, plugs all good (new) checked for spark..... leeds coils ignition box all good.... cleaned out the carb just because, fuel filter air filter bla bla. what i found after cranking it over...... still only one cylinder (rear) firing and absolutely nothing from the front, if i had placed a feather in the end of the pipe it wouldnt have got blown out. no pumping of anything. so i guess that means svs now how the f#%k do i fix that, cant get seafoam here but im sure there will be something similar, like to try something easy before pulling anything apart did find Marvel Mystery Oil.... but it would take too long to ship.... it did backfire out through the carb a few times.....   Logged     Last Edit: 2017/11/19 06:55 By masterhermit.   The administrator has disabled public write access. #1025358 roadiemort (User) Platinum Boarder Posts: 7904 Re:HELP...... one piston not firing 3 Months, 1 Week ago   masterhermit wrote: hey all for the reps.... finally got around to my sons and we can safely say it not electrical, plugs all good (new) checked for spark..... leeds coils ignition box all good.... cleaned out the carb just because, fuel filter air filter bla bla. what i found after cranking it over...... still only one cylinder (rear) firing and absolutely nothing from the front, if i had placed a feather in the end of the pipe it wouldnt have got blown out. no pumping of anything. so i guess that means svs now how the f#%k do i fix that, cant get seafoam here but im sure there will be something similar, like to try something easy before pulling anything apart did find Marvel Mystery Oil.... but it would take too long to ship.... Can you get Yamaha ringfree at your dealer? it did backfire out through the carb a few times..... Can you get Yamaha ringfree at your dealer?   Logged     Last Edit: 2017/11/19 07:51 By roadiemort.   The administrator has disabled public write access. #1025630 masterhermit (User) Expert Boarder Posts: 583 Re:HELP...... one piston not firing 3 Months ago   well the decarb spray sh*t didnt work.... pulled the valve cover off and could see that only 3 of the push rods were moving, so going to check the valve lifter on the one thats not moving....? so why would 3 push rods move and 1 not....? what should i check....?   Logged     The administrator has disabled public write access. #1025635 davej (User) Platinum Boarder Posts: 18167 Re:HELP...... one piston not firing 3 Months ago   Cam/lifter issue of some sort. Is the valve on the non moving push rod stuck open or closed?   Logged     Last Edit: 2017/11/25 18:17 By davej.   dave   The administrator has disabled public write access. #1025729 masterhermit (User) Expert Boarder Posts: 583 Re:HELP...... one piston not firing 2 Months, 4 Weeks ago   davej wrote: Cam/lifter issue of some sort. Is the valve on the non moving push rod stuck open or closed? sorry for such a slow reply.... from what my son says, stuck closed   Logged     The administrator has disabled public write access.

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