doomanmxz99 Posted January 10, 2013 Share Posted January 10, 2013 I have a 4 year old lazer mag that wont idle but starts and runs great. Everyone is telling me to take in so I did. Went to D rock and got a call saying it had no compression and cylinder scored not worth repairing. I am a diesel mechanic and I couldnt believe it had no compression. Checked myself and I get 115psi. Checked my 20 year MagIII plus and that had 96psi and that one purrs like a kitten. Checking around I found brand new OEM carb for 63.00 was wondering if you guys thought I should give it a shot or had any ideas???? Thanks Link to comment Share on other sites More sharing options...
hydro Posted January 10, 2013 Share Posted January 10, 2013 Since it sounds like you are familiar with mechanics, why don't you check it yourself? Do you have a scope at work that you can use to look through the plug hole and see the cylinder wall?If the cylinder is scored, did you run the 100:1 oil mix? If the cylinder looks good, then you would just need to go through the carb, clean, and re-tune. Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 10, 2013 Author Share Posted January 10, 2013 I did look in the cylinder and it has a some marks but it is not to bad and by the compression numbers doesnt seem to effect it. I didnt mess with it myself because I was being lazy. It has the tecumsh carb and it says its non adjustable is another reason I didnt mess with it. Couldnt find any info on adjustments. Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 10, 2013 Author Share Posted January 10, 2013 About the cyl score I bought it at the end of the last ice season and it seemed good cut about 20 holes or so. I dont know what the previous owner ran in it but I run Amsoil at 50 to 1 Link to comment Share on other sites More sharing options...
IL Res Posted January 10, 2013 Share Posted January 10, 2013 My S/M had similar symptom as yours [ ran fine @ high speed, had a bad idle ]. As I was removing the fuel tank, I found the carb was loose. Tightened the carb, it's been fine since. Check the screws running thru the tank. The carb is sandwiched between the tank and engine. Hope this helps. Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 10, 2013 Author Share Posted January 10, 2013 Thanks but I did check that and all the bolts are tight.Ordered the carb and will see and let you know how that worked Link to comment Share on other sites More sharing options...
g_way Posted January 11, 2013 Share Posted January 11, 2013 My LZRMag wouldnt idle either. I found that the plastic fuel inlet elbow on the carb had a hairline crack and was sucking air. $1.33 later it was fixed Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 11, 2013 Author Share Posted January 11, 2013 Will check that thanks for the info and did it leak gas???? or no Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 14, 2013 Author Share Posted January 14, 2013 I cant see any cracks on the inlet. Are they easy to see all I see in the casting lines. Link to comment Share on other sites More sharing options...
g_way Posted January 14, 2013 Share Posted January 14, 2013 The crack I had was noticeable. the new elbow when pushed on the the inlet would not rotate either. It is pushed onto a splined fitting. Link to comment Share on other sites More sharing options...
doomanmxz99 Posted January 14, 2013 Author Share Posted January 14, 2013 My elbow rotates pretty easy so I guess that it should not rotate ???? Link to comment Share on other sites More sharing options...
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