batman wrote on 07/09/18 at 17:14:20:The carb pulls it's highest vacuum and supplies it's least fuel at idle .If the intake manifold is leaking air ,I would think the idle and low speed throttle setting would be affected much more than higher speeds.
In that vein ,I would suspect a fuel delivery or ignition problem.
Higher speeds require the voltage used by the spark plug to be higher ,(and the plug wire ages and may crack allowing the spark to jump to ground before reaching the plug) you might try wrapping the plug lead from the coil to the plug cap with electrical tape.(If the ignition module is working at idle and above there is no reason to thing it's not working at higher speeds)
Some rebuild kits have been known to come with the wrong jets that are way to small ,stock size are 47.5 pilot 155 main for your 86 . The fact that you have the Raptor is good , but the person you had rebuild the carb may not have been aware that thereis another very fine screen filter that sets above the float valve seat in the carb body that the fuel passes through,that might be partly plugged (causing the float bowl level to drop at higher speeds(,higherflows),starving the carb).
There is the advantage in not letting others work on your bike, Like you knowing what size jets your running ,and what procedures to follow that others may miss.
Batman, you help is greatly appreciated! I took a look at the old jets that came out of the carb and they are indeed 47.5/155 so I'm going to ask my mech to take a look at what's in there now, since he has it off the bike already. The pilot air jet (70) was also replaced so that may be worth checking while he's in there, even if it's not a common problem.
I'll also ask him to tape up the plug wire from the coil as the plug cap was replaced last year but the wire itself is original.
I suspect the fine screen you're referring to is part #20 in the attached diagram? The original was taken out and hopefully replaced! I'll mention that to him as well but unless it got clogged up immediately after installation it should be good.