High revving Hi my bike runs fine, but it has a high rev for some reason, its not the idling screw thats the problem, also when i twist the throttle, theres a dead spot before it catches again..it us as if the bike floods then catches again. tanx

The idle screw only adjust where the throttle comes back to when the throttle is released..need to check the gas/mixture screw sound like it is not set right..good luck..

You are on the right track with the fuel system. Maybe the fuel filter, There is one in the tank also, I think. Try running on reserve if you have it.

if not a float level or jet problem
worn carby
ebay sellers have them

that is your idle air control valve. it is located on the throttle body next to the throttle position sensor

When you open and close the throttle can you hear the slide hitting the throttle stop?have you removed the slide, and fitted it in the reverse order, this would restrict full opperation of the slide leaving it in the part open position, the cut out side of the slide faces rearmost away from the engine, if you have exsess play in the cable at the carb, it is poss you may have fitted it wrong, unscrew the tickover screw almost all the way until you no longer hear the slide hitting it on throttle closure, start the bike you may have to hold the throttle at the desired revs, whilst doing this screw in the tickover screw until it just increases the tickover, you can now release the twist grip and addjust the idle to suite

what exactly are we dealing with. but it should be 1 for throttle, and 1 for choke.

Yes, could be dirty carbs, but it sounds like a bad throttle cable to me. Check your throttle cable. It should operate with no binding, and it must freely spin back to closed when released from any position, especially full throttle. Try this procedure several times (with the bike turned off), while turning the handlebars to both stops and testing this freeplay. The throttle should operate freely throughout the entire left/right travel, including at both stops. The cable can/should be lubed, if needed. Your user manual should list a procedure for that. Also, put some penetrating lubricating oil (I prefer ProLong super lubricants myself) on all the throttle linkages, too. They tend to bind up with age. If it still sticks, you might get lucky and get away with using a high-quality fuel system cleaner to help free up the carb float response. Otherwise, you probably will need to have them disassembled and cleaned. As long as you're in there, get 'em synched, too. Good luck!

Hi and welcome to FixYa,

Two possible reasons:

• faulty throttle cable. There should be a spring like feel when throttling/revving the bike. If none, then either the cable is broken or the lock has been dislodged from its hooking point between the carbs;
• vacuum leak. Another indication of a vacuum leak is relatively high idling RPM even when the choke is in normal position. Vacuum leaks could be caused by a cracked rubber connector from the carbs to the intake port, a loose/crack vacuum line or missing carb balancer rubber cap/cross-over.

Good luck and thank you for using FixYa.