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Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal. https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day. max rpm idle screw adjustment difficult Carb Sync Honda Valkyrie Honda GL1500 Service Manual http://www.partsfish.com/page/oem-parts-for-honda Honda 1997 GL1500C Valkirie Owner Manual
Sounds like the engine governor is out of adjustment or it is sticking. The engine governor job is to regulate the engine RPM and torque that is needed to power a load and return to the manufactures no load engine RPM. Recommended RPM's on pressure washers and generators are usually governed at 3,600 RPM's because that is where the engine is producing most of its torque and HP.
Your compressor was designed to produce 11.8 acfm at 90 psi turning neer max rpm (depending on pully combination between 800 ~1100 rpm ) with max pressure of 135psi. At 3600rpm the engine is producing max hp of 5 to 5.5. More power would not really produce more air without potentially destroying the compressor pump by over-reving. If your compressor is not functioning properly you will not get good air flow. Check instruction manual for time period to fill tank from empty. Could be 2 ~3 min. It is takes longer then problems. You can tell how your pump is doing by periodocally checking the length of time to fill tank. The next size range of gas compressor is about 8~9 hp with four cylinder pump and will deliver about 17 cfm.
Is the washer a direct drive or belt drive unit? If it is a direct drive ( the pump bolts directly to the engine) then the pump needs to be force fed the water, either by city pressure or a transfer pump. If it is belt driven, the lower rpm's should pull water, so more detail would be needed...
At an engine lower and higher rpm is because of the governor sensitivity sistem.An arm attaches to the shaft(inside the crankcase)with a clamp-bolt/nut.This arm are provided with a series of holes.To decrease sensitivity hook the spring into a hole lower than its original position.If needed you can make some extra adjustment holes.Hope this help you.