trialsmm Posted October 21, 2007 Report Share Posted October 21, 2007 My rebuilt 1975 TY175 is running poorly. This is the first running since engine rebuild. It runs fair, but pops and kinda backfires. Doesn't want to idle. I've gone back and checked timing several times. I put a new carb on, but it still runs the same. Could it be the capacitor or coil? Any hints would be great! Mick Quote Link to comment Share on other sites More sharing options...
max1956bikes Posted October 21, 2007 Report Share Posted October 21, 2007 My rebuilt 1975 TY175 is running poorly. This is the first running since engine rebuild. It runs fair, but pops and kinda backfires. Doesn't want to idle.I've gone back and checked timing several times. I put a new carb on, but it still runs the same. Could it be the capacitor or coil? Any hints would be great! Mick try gapping points so they only just open very small gap.put rag over screwdriver to wipe clean points.now try it.then put new points on if runs ok Quote Link to comment Share on other sites More sharing options...
trialsmm Posted October 21, 2007 Author Report Share Posted October 21, 2007 (edited) My rebuilt 1975 TY175 is running poorly. This is the first running since engine rebuild. It runs fair, but pops and kinda backfires. Doesn't want to idle.I've gone back and checked timing several times. I put a new carb on, but it still runs the same. Could it be the capacitor or coil? Any hints would be great! Mick try gapping points so they only just open very small gap.put rag over screwdriver to wipe clean points.now try it.then put new points on if runs ok I have set the timing at .007" btdc with dial guage several times. Thanks, mm Edited October 21, 2007 by trialsmm Quote Link to comment Share on other sites More sharing options...
scottt Posted October 21, 2007 Report Share Posted October 21, 2007 Change the condensor, mine did the same popping and banging a new condensor sorted it out. Quote Link to comment Share on other sites More sharing options...
trialsmm Posted November 19, 2007 Author Report Share Posted November 19, 2007 I finally replaced the condensor and that fixed my problem. Now to finish with the paint! Quote Link to comment Share on other sites More sharing options...
samb Posted November 22, 2007 Report Share Posted November 22, 2007 My rebuilt 1975 TY175 is running poorly. This is the first running since engine rebuild. It runs fair, but pops and kinda backfires. Doesn't want to idle.I've gone back and checked timing several times. I put a new carb on, but it still runs the same. Could it be the capacitor or coil? Any hints would be great! Mick SOUNDS LIKE THE CONDENSOR IS BREAKING DOWN , PLEASE CHECK THE FACES OF THE POINTS ARE CLEAN WITH NO PIT MARKS . THESE CAN BE CLEANED WITH GLASS PAPER , THEN PASS A CLEAN PIECE OF CARD THROUGH TO REMOVE ANY DIRT . THE IGNITION TIMING SHOULD BE SET AT 1.8 MM BEFORE TOP DEAD CENTER . USING A DIAL GAUGE IN THE PLUG HOLE AND A POINTS METER TO CHECK WHEN THE POINTS ARE CLOSING . ALSO CHECK THAT THE PILOT JET IS CLEAN REMOVE USING AN SMALL FLAT SCREWDRIVER NAD BLOW THROUGH IT BOTH WAYS THIS STOPS THE MACHINE FROM TICKING OVER . SAM B Quote Link to comment Share on other sites More sharing options...
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