90 hp Chysler throttle problem

[Blainesk8]

simpley the problem i am having is the motor starts up and runs great but once you put the trottle down half way it wont go any faster and if you put it down all the way it wants to stall out. Its liuke it just has no top end. Any ideas?

 

[maxum247]

Re: 90 hp Chysler throttle problem

With the engine (not running) and the throttle control in the wide open position, look in the carbs and check to see if the choke and throttle valves, (plates) are set to the horizontal position in each carburetor, anything more will stall the engine speed.
Check the timing linkage and be sure it isn't binding! max!

 

[Blainesk8]

Re: 90 hp Chysler throttle problem

im limited in motor experence, is there an easy way to check the timing likage?

 

[Frank Acampora]

Re: 90 hp Chysler throttle problem

Usually, the problem you are describing is due to lack of fuel. It gets enough at low speed to run well, but when you go to throttle up, it will not get enough and will stutter and stall. Happens quicker at full throttle because fuel needs are so much higher.

You need to check the fuel system for clogs or restrictions right from the fuel tank to the carburetors. If you have a quick connect fuel fitting, be especially careful to remove the male fitting and check the hole in the threaded end. Crap collects in there and really restricts fuel flow.

If the engine has not been run in a while, you absolutely need to remove the carbs and clean them. Varnish forms in them and really gives you headaches

You also should change the fuel pump diaphragm. Just follow the fuel line through the engine shroud. Where it connects is the pump. Six screws hold it together. Easy 15 minute replacement --3-5 bucks for a diaphragm and gasket