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13 carb model sputtering at wot

307 Views 2 Replies 3 Participants Last post by  Memosrt4, 
Jbone302
2
So I bought a used 13 yfz. Had a gutted stock muffler so I replaced it With a hmf slip on. Bike ran just fine but I noticed it was still hot on the header pipe. I replaced the jets with a 48 and 170. Now it runs ok until but at wide open throttle it starts to spitter and chug. was advised to adjust the air fuel mixture screw but I don’t believe I have one. Any help would be appreciated. I have insert pics of the carb for reference
Toy Machine Personal protective equipment Engineering Metal

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Chango
I believe the fuel air fuel mixture screw in one of the area I circles. Not to familiar with 13 carbs. Hope this helps

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Memosrt4
Mine was doing the same when I bought it. I messed with the needle and changed out jets but no luck. It turned oit to be the air box lid hole is too small. Try it without lid and see what happens. Mine has the yoshimura rs-2 muffler and the Sparks racing big K&N filter mod.
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