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Everything Dirt Bike
Make / Model Specific
Yamaha
1980 Yamaha TT250
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<blockquote data-quote="Serf27" data-source="post: 209736" data-attributes="member: 4478"><p>Hey everyone, new to the forum here and stumped on this bike.</p><p>I had the carb soda blasted today, cleaned out all the ports, new pilot jet and main jet and some new O-rings and it still won't idle without the choke</p><p></p><p>About the bike</p><p>1980 TT250, old but rides well.</p><p>aftermarket pod filter.</p><p>Stock main jet is 165, I put a new 170 main jet. From 1/4 throttle to WOT it runs great. </p><p>Stock pilot jet is 17.5, I put a new pilot jet size 20, recommended by the dirtbike shop.</p><p></p><p>With the choke on/open the bike will start right up most of the time and will idle on its own cold and warm with the he choke on.</p><p>As soon as I take the choke off it starts to stumble and dies.</p><p>I can take off fine with the choke on.</p><p>The choke closes by itself when riding and continues riding fine. When I start slowing down to stop, I need to put the choke on so it will idle and not die when I stop.</p><p></p><p>The choke is an enrichment choke I believe, because of this, does it run and idle with the choke on because it gets more fuel? Would I get a bigger pilot jet to solve this?</p><p>Thanks.</p></blockquote><p></p>
[QUOTE="Serf27, post: 209736, member: 4478"] Hey everyone, new to the forum here and stumped on this bike. I had the carb soda blasted today, cleaned out all the ports, new pilot jet and main jet and some new O-rings and it still won't idle without the choke About the bike 1980 TT250, old but rides well. aftermarket pod filter. Stock main jet is 165, I put a new 170 main jet. From 1/4 throttle to WOT it runs great. Stock pilot jet is 17.5, I put a new pilot jet size 20, recommended by the dirtbike shop. With the choke on/open the bike will start right up most of the time and will idle on its own cold and warm with the he choke on. As soon as I take the choke off it starts to stumble and dies. I can take off fine with the choke on. The choke closes by itself when riding and continues riding fine. When I start slowing down to stop, I need to put the choke on so it will idle and not die when I stop. The choke is an enrichment choke I believe, because of this, does it run and idle with the choke on because it gets more fuel? Would I get a bigger pilot jet to solve this? Thanks. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1980 Yamaha TT250
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