cgamla Posted December 23, 2003 Report Posted December 23, 2003 Ok here it goes. I have been battling this for months now so I really need some good technical help. I rebuilt the top end on my shee -had the cylinders bored 30 over with new pistons and rings installed. Everything was fine until the crank on the left side let go about two tanks of fuel later. I ended up with some scratches in the left cylinder wall also. Well I got a new crank and crank seals. Honed out the cylinder myself. Checked my ring end gap which was about .016 which was under the max allowable although far from perfect. Slapped it all back together and it seemed to run fine. Then I noticed that it smoked more out of the left side. I ran it for a while figuring something with the home hone job I did might need a little break in time. Well after a few tanks of gas all I got was more smoke and fouled plugs, I could not detect any loss of transmission oil ( I assumed that it was sucking oil through the case halves) but once again no loss of transmission oil. Still not convinced though I split the cases again to check things out. I found nothing wrong with the case halves. Put it all back together again. The cylinder that is smoking and fouling plugs has 145 pounds of compression. I run a Trinity 1 to 2 carb set up so rule out carb differences right away. The left side does not always fire when at idle. In fact I can put my hand over the right exhaust and feel every perfect hit but when I put my hand on the left it just blows cold air at idle. One other weird note on this is that I run FMF pipe and silencers so this enables a llittle more noise to come out of the engine area and one thing I notice is that when the left side fires especially right off idle the noise that comes from the pipe seems quite a bit sharper and louder than the right side. Any help will be greatly appreciated. I am having a hard time beleiving that a cylinder with 145 pounds of compression would smoke so bad. Also just so we're cllear I know the difference between smoke and steam from a head gasket leak. This is blue smoke that stays in the air and does not evaporate like steam. Sorry for the long post but it takes a while to get the facts out. Quote
spoin39 Posted December 23, 2003 Report Posted December 23, 2003 I can tell you know what you're doing but everyone makes mistakes, so here is the question that may make me sound like an idiot but have you checked to make sure that the lazy cylinder doesn't have the piston in backwards? I have seen this before after my girlfriend rebuilt her's. She was so prood of herself and when she rode it one side ran like@#%! I helped her take it apart again and found she put the exhaust end in backwards. Just a suggestion cause it sounds like everything else you have double checked. Quote
boonman Posted December 23, 2003 Report Posted December 23, 2003 How are the reeds? And if this side is 145, what is the other side at? I cracked a reed and it exhibited the same symptoms. You say you have ruled out a head gasket leak, and I am pretty positive that you have, being that you already tore the motor down in between, and put it back together, and it does the same thing. The 2-1 carb situation is a bit deceiving, ruling out carburetion error. SO, you have to look at what is controlling fuel delivery after it is sucked out of the carb. The reeds. And porting. Quote
cgamla Posted December 24, 2003 Author Report Posted December 24, 2003 Spoin thanks for that Idea. I have made simple mistakes like that inthe past and I will double check it this weekend. Boon while I am checking for piston ports I will examine the reeds and cages and even if I see nothing wrong with them I will switch them from one side to the other and see if the problem follows the left side cage. I will also take a compression reading from the right side prior to tearing it apart. Hell I'll even switch the plug wires. I run a ADA head with 20 cc domes and I am at sea level. I think they are 20 cc domes I forget now but it seems to me when I ordered them I bought whatever was 2 cc's smaller than stock. I also run my timing advanced two degrees. That is only for this break in period. I usally run about 5-6 degrees. Thanks so much for all the help!!!! Quote
spoin39 Posted December 24, 2003 Report Posted December 24, 2003 Your welcome, and I hope you find the problem! Quote
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