Re: \'97 Ultra Spx
Hey F14 you could be seeing that Bog due to your carbs synching. I've been told by a former Polaris mechaninc to not synch them with a synch tool, but rather to do it manually. Here's a copy of that post:
Subject Re: Carb adjustments.
Posted by ExcursionPSD (stranger )
Posted on 7/7/00 02:27 PM
From IP 188.8.131.52
96 Ultra SP is the 680cc reed-valved single piped version of the 96 600 XCR SP triple pipe that I own. You have three 38mm mikuni slide valves with individual cables going to a cable box under the hood. DO NOT do a uni-synch (flow-type) sysnchonization! Polaris found out that synchronizing the flow at idle with reed-valve three cylinders witch expansion chambers, will not give synchronization off idle. You must do a mechanical synchronization.
1. get the air box off, carbs in proper place and have throttle cables secured approximately where they would be when the air box is is in place (different bends of the cables will change synchronization.
2. make sure the carb caps are all hand tight on the top of the carbs, (as they would be in normal operation)
3. Back off all the idle stop screws and let the throttle slides hang from the cables (inside the body of course)
4. Back off each lock nut on the cable adjusters on the carb caps. make sure the cable adjusters turn freely
5. use approximately a 1/4" piece of smooth rod or smooth drill shank (even the stamped numbering can goof you up) and slide this in the bottom of the throttle opening and then by turning the cable adjusters, adjust the bottom edge, air box side, of the throttle valve, until it just squeezes the 1/4" rod. try sliding the rod in and out slightly and you will find it easy to tell when it first gets squeezed by the throttle valve.
6. Do this to all three carbs and you now have the throttle valves synchronized to each other. snug down the cable adjuster locknuts temporarily.
7. Now go up one size in rod (17/64) and do the same concept except adjust the idle stop screws to raise the throttle valves, to squeeze the rod. You now have the idle stop screws synchronized.
8. From this point on adjust the cable adjusters together (count the number of flats or turns when adjusting) also the idle stop screws together (count the turns) and they WILL STAY SYNCHRONIZED.
9. You have to reinstall the airbox, refasten the throttle cables in position, adjust idle speed (after starting and warming the engine), adjust throttle cable slack (should be about .030 play at the trigger throttle) final tighten the cable adjuster locknuts.
I am a Polaris certified master snowmobile mechanic, I know this is the right way to do it, it works.
I did mine this summer this way, and it seems to have worked out great. I've got some snow on the ground, now I can test it.