posted
hello all.... i have a S7C in a Inferno MP6 International, just put a new piston/sleeve in the motor with proper break in..here's my problem: i cant seem to kep the temps down bellow 240-250, and cant seem to get it to stay at idle with out flame-out....here's my settings now main needle 4 turns out low needle 4 turns out running O Donnell 30% #8 RB plug koyosho foam air filter
any suggestions please?? thanx in advance!
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posted
Since you are using a 1003-S7C in a buggy, it is quite possible that you have some problems caused by the smaller cooling head.
This engine is not really intended for use in (heavier) buggies, so unless you have switched to a larger cooling head (p/n 1070-WS7 would be a direct replacement), this can cause your engine to run hotter...we have heard 20-30 degrees is not uncommon.
For initial carb settings, check the following link:
This should give you a rich setting, and then you can carefully lean from there...just also remember that your engine came with a 9mm carb instead of the normal 8mm carb used in buggies.
posted
The turbo plug engine does not like off road and heavy cars! It will continually flame out on you, as a friend of mine found out. Put a 8mm restrictor in the carb (if it will take one) or change to a 8mm carb and get the regular S7 head or an O'Donnel head.
Posts: 15 | From: Weatherford, Tx. USA | Registered: Jul 2002
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Zipmaxx
unregistered
posted
ok, sorry folks!... I never got a manual with this engine, so I was just matching it up to the pics on RB's site... turns out, this IS a standard S7, with the 55mm, 11 fin head.. and I assume the 8mm carb.... I had tried setting the carb to the suggested settings, and it would run the tank thru just fine, but when I would shut it off for cool-down, I would need to change the glow plug..... what am I doing wrong?.... thanx for all your help
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posted
When you changed the piston/liner, did you check the conrod/big-end fit? Also do you have 0.4mm of shims between the cooling-head and liner?
If for example you have too much play between the conrod/big-end it can happen that due to the play the piston comes too close to the combustion chamber and so this can cause the overheating. Also if you do not have enough decompression shims, the engine can overheat(same problem, the piston comes too close to the combustion chamber).
posted
hello again... ok, I checked the big end, and is ok, and the shims are in place..... i had my doubts about the fuel tank in the buggy, so I put a new tank in, but still couldnt get running.... i took out the RB #6 plug, and tried a OS#8, and has seemed to run good!.... temps around 245, and a good stream of smoke fro the exhaust..... will this plug switch hurt/damage the engine?
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Hi, My S7 always runs hot. It has always wanted to run at app. 130 celsius. If I tune it for a lower temp it bogs down after a while. The engine now has 12 liters of 20% Pink-Devil through it. When cold piston still sticks (had it apart last-night) and the conrod play seems excellent.
Now did i understand your advice properly? would adding a 0.1 shim make the engine run cooler?
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