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General Category >> Rubber Side Down! >> Bogging down at stop after dyna + carb rejet
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Message started by motobutch on 06/02/26 at 06:26:43

Title: Bogging down at stop after dyna + carb rejet
Post by motobutch on 06/02/26 at 06:26:43

Hi All,

I ride a 1998 savage and recently did the harley dyna muffler swap and rejetted the carb to 52.5 pilot and 152.5 main. I replaced the white spacer with 3 washers and have the mixture screw out about 1.5 turns (I ride at sea level). For the most part it's been riding well, but sometimes when I slow down quickly and stop, the engine RPM drops really low (and has died twice). If I give it a tiny bit of gas when it's bogging down at a stop it will recover after a few seconds and idle better without needing any throttle.

I have also noticed that it idles best when starting from cold, but as it warms up the RPMs drop. This makes me think it might be running rich and the pilot jet is too big (I don't wanna go under 1 turn on the mix). However, when I start opening up the throttle and going from the pilot circuit to the main in second gear, the bike feels really lean in the 1/8-1/4 throttle zone (where it sometimes backfires), making me think the main is too small? This is my first time tuning/rejetting a carb and am looking for pointers on where to start troubleshooting :-?

Title: Re: Bogging down at stop after dyna + carb rejet
Post by Serowbot on 06/02/26 at 09:23:55

My tips
Serowbot's carb tuning tips for beginners
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1309246277

Title: Re: Bogging down at stop after dyna + carb rejet
Post by DragBikeMike on 06/02/26 at 13:25:55

Motobutch, my experience with the engine dying under hard braking is that it can be related to float level. Too high or too low can both cause the engine to die under rapid deceleration. Same goes for hitting a big pothole or other abrupt obstacle.

I have seen some Mikuni VM carbs that have a special brass baffle that surrounds the main jet in the bottom of the carb. That baffle is meant to mitigate fuel slosh during abrupt maneuvers. The Keihin PWK carbs come with the special baffle built into the metering block. Try and check your float level.

Hey Serowbot, pretty cool tutorial. You put a lot of work into that. Nice job.