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Jd b timing carb adjusting

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peter

10-20-2002 14:33:36




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just rebuilt my jdb runs good but put it on dyno and under a load it spits and sputters and i can get only 22hp at pto and manual said it should have 27.6hp flywheel and govenor gear lined up dist is the way the book said put dist where book said for proper timming adjusted valves to 20000 set float but am not sure if it is done correctly i set the float to 1/2 inch closest to needle not sure if thats correct also coverted to 12 volt but i didnt change condensor was told i didnt have to coil was changed and i put an alternator on it also how do you time this with a timming lite help thanks in advance pete in michigan it is a 1951 late model b

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2 cylinder

10-20-2002 16:20:43




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 Re: jd b timing carb adjusting in reply to peter, 10-20-2002 14:33:36  
With the information thats provided, it almost sounds like the tractor is starving (not getting enough fuel). The manual recommends the idle needs to be set at 1 to 1 1/4 turns open and the load jet to be set at 3/4 to 1 turn open for the JD-B. The carb. setting along with the timing listed in the manual are not always where the tractor will run or perform at it best. Your horsepower can very by 4-5 HP or more depending on your timing and carb. setting. When most tractor pullers (myself included) dyno their tractors for peak horsepower, they usually set the carb for peak horsepower first, then set your timing for peak horsepower. If you have easy access to a dyno this might be an easy experiment to try. Another thing might be a bad coil, or possibly a warn bushing in the distributor which can allow your points gap to vary. But not getting enough fuel is often the reason for spitting and sputtering. Hope this is more help than harm!

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