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ChadS
09-07-2004 07:06:12
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Re: More On IH Carbs in reply to ChadS, 09-06-2004 09:05:44
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Ok, you have a good running carb on your tractor, and ready to rejet the carb. All the work is done in the bowl of the carb. After removal, you will disassemble the parts from the bowl,,, Main load adjustment screw, and the brass fitting, the center brass metering stem, (center of the carb, where the venturi sets over.) Be careful though,,, the small brass idle stem is very fragile, and if you drop the carb bowl, or bump the stem, damage to the stem will result. Use compressed air to clean out the passages in the bowl, or let it soak in cleaner if it is extremly filthy. Now you need to take the carb bowl with ya to town to the hardware store, To the drill bit isle!! You need to find the drill bit, that fits the main load jet that will tell you what size your current jet is, then you go up 4-5 more sizes larger drill bit. Ok, back home,, LOL,, drill out the main jet with the larger bit, then, with the same bit, drill out the bottom 2 holes on the metering stem. Clean out the shavings from the bowl, and the metering stem, and reasemble the bowl. On the main load adjustment for starters,, turn it all the way in on the seat, and back it out 1-1/2 turns, should allow the engine to start with out being too rich,,, Basicly the engine needs to be warmed up, and when you set the main load adjustment,, Get a helper to run the throttle, might be a bit safer, and save ya from running back n forth so much,,, Back the main load adjustment out till it starts to run rich, or smoke black out the pipe,, then turn it back in till it just smooths out. idle it back down, and rev it up a few times, there should be just a hint of black smoke come out of the pipe when you rev it up, (no load). To get the most out of this, is to put it on the dyno, or a pto driven implement to work the engine harder. I can tell you all this,, every time I rejet a carb on an IH, always found 5-10 more hp at 540, just depends on how good your ignition, and compression, cu in. Do I need a bigger carb??? More on that later,, ChadS
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