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Offline Big Mike

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49 intek
« on: November 19, 2015, 09:52:09 pm »
49 intek fully built runs great revs up fast. Problem when idling the exhaust & head temps are within 20-30 deg after a few revs #1 cyl is 285 & #2 cyl is 480 deg, motor will idle & stall. i found a air leak the first time on #1 removed intake resealed changed jets from 40s to 44s put it back together now #1 is good temp 285 but #2 is now 485deg. i sprayed cleaner around intake no change in rpm or running same with carb gaskets. i know this is not a normal temp slit for a engine but it seems to be no leak on the outside but i know there is one somewere. any ideas?
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Offline docbro

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Re: 49 intek
« Reply #1 on: November 19, 2015, 11:06:26 pm »
Are the plugs the same type and age?, are both coils good? do you have a vacuum port on one side of the intake for the fuel pump?  Just some of my ideas...
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Offline Jim Knutson

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Re: 49 intek
« Reply #2 on: November 20, 2015, 09:12:21 am »
Check for a burnt, or bent exhaust valve in #2 head.
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Offline rotten ron

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Re: 49 intek
« Reply #3 on: November 20, 2015, 03:59:26 pm »
Pull the plug wire off the one that is hot just to see if it will even run on the cylinder that is cold
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Offline Gui961

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Re:
« Reply #4 on: November 20, 2015, 06:49:53 pm »
mine idle at 5-600deg on both. it will do someting similar to what you say if the twin carb are not working at the same time or if idle are not setup exactly the same..

maybe one of the buterfly is bend in the carburator. it could be checked with vacuum test. or try another carb
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