I have gsx 750. i have cleaned the carbs as they were leaking gas. After cleaning they are fine but at high revs the bike backfires. I have also installed Sankei mufflers for Honda vf 750. The engine runs hot after 15 min. alos the charging problem has come up. the battery died got it recharged but after 15 mon of run it went dead again

If is runs better with full choke, then the bike is lean, check for air leaks at the carb manifold, vacumn cracked hoses, non standard exhausts, perhaps the mufflers have rusted out while sitting

you say you cleaned the carbs, but did you pull and clean the jets ? they are very very tiny holes, and take like nothing to plug them. pull the jets and run a wire from a wire brush thru them, should start for you now

Starving for fuel.
Make sure carbs are getting fuel.
Make sure fuel filters are clean,
make sure fuel pump is working.

If carbs are getting fuel but wont rev, you need to clean your carbs because your jets are clogged

This is often caused by an air leak , inlet manifolds, exhaust gaskets into the head or the gaskets between the headers and muffler.
This is assuming all the rest of the bike is set correctly, valve clearances,airfilter, clean carbs

run a can of Seaforam in the tank..purchase from Autozone put in 1/3 to two gallons gas drive it around for at least 10 miles to insure it cleans out the whole carb system.if that doesnt work, check all carb hose fittings when bike is at idle spray some Chemtool B-12 ( also at Autozone) around the carb hoses and manifolds..if idle increses thats your problem. Caution: chemtool is very toxic wear gloves and a mask.

The gas has varnished and turned to ****. You need to take it to a shop and have the carbs cleaned. Next time you decide to store the bike put fuel stabilizer in the tank and run the bike untill the stabilizer gets into the carbs. When you want to store it, turn the gas off and let the bike run all the remaining gas in the carbs out. That is your best bet. Chaz Moto DC

vac leak craked boots

i think your issue is while at a steady cruising speed one of the carbs is not allowing steady fuel flow. so when you nail it, you cant hear or feel it. or maybe you can just a bit right when you hit it. one thing you can do short of taking the carbs off and cleaning them is, take the air filter apart and start the bike rev it up high and with a large clean rag shove it into the back of carbs and cut off ALL AIR FLOW.. at the same time, twist throttle wide open. doing this will flood out and kill the engine. but at the same time, it will sometimes clean any debris or grime out of the jets. try it a couple times.. hope this helps.

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.