Question about Yamaha V Star Custom Motorcycles
Backfire & Jetting: Yes, the backfire is caused by the bike running lean which is caused by more air than fuel the "air fuel mixture."on the left side above the engine cover there's a side/tool cover. Take it off. Under the tool compartment and above the air injection canister there's a hose. Take it off and hide it for a better time. The air inlet metal nozzle should be plugged. If you have the
plug/rubber cap delivered with your hypercharger use it but turn it inside-out attach to the nozzle and let it plip back dragging aroud the tube.
The bike is running lean.Its the PMS adjustment problem related to carbs problem.
owever, you will need to adjust your PMS screws, so you will want to start that process while you have the carbs off the bike to rejet. If the carbs had never been touched before you will have a thin brass cap with a tiny pinhole in the center that covers your PMS screws. You'll need to enlarge that hole, you can use a drill bit (but be very careful because the screws underneath are soft brass so easy to mess up if you drill too far!), insert a self-tapping screw and yank those caps off. After you rejet you might want to run the screws all the way in until lightly seated, then back them out about 3-3.5 turns. While you have the carbs off make sure to do a bench sync to get the sync on the carbs close and then once reinstalled you will want to do a proper sync on them.The carbs have a idle enrichment circuit. If the idle enrichment diaphragms are stuck in the closed position, the bike will backfire when the throttle is shut down. You can't remove these parts for cleaning without seperating the two carb bodies (and then needing to synchronize the carbs after reassembly).
Working on your carbs is not difficult if you have a basic grasp of tools, a basic understanding of what you are doing and go slow.
The other option is to get it done by the professional mechanic in your area.
Have them re-jet the carbs and synchronize them.....that high of an altitude would probably change the air/fuel mixture......If the front header pipes are turning gold it is too lean and if they are becoming blue it is too rich.
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Posted on Jul 13, 2010
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Posted on Jan 02, 2017
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