I just bought a 1978 650b.It needs alot of tlc.carbs look clean when i took them apart.looks like a pretty good set of points.bought brand new plugsit doesn't want to idle below 1500 rpm by it self.idle surges then stalls.carb sync? or good cleaning?anyone have any suggestions?

Hi,

It sounds like you've done a long list of troubleshooting activities. At this time, it might be good to call Ryobi and ask them for a local dealer that can provide a free in-person analysis of your machine in order to get it to start again.

Thank you.

I bought a brand new 13 hp Tecumseh on my rider,was trouble from day one,fought it tooth and nail,finally took to shop,they put a brand new Taecumseh carb on it,couldn't get it to run,went to a dinky lawn mower shop,was told the carb was not the right one,wow,they sold me a used one that looked way different,but it worked super,so try another non-tecumseh carb or fight it forever.

Hey Anon,
Cleaning a carb is not an easy undertaking,, there are several tiny passages, tiny jets, and the needle/seat assy, If you are not trained to know these.. you may not get the carb as clean as it needs to be... Install a new spark plug... a new air filter.. and get a qualified pro to clean and set the carb.

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A brand new snow blower ?? Who made it, single or two stage, 2 cycle or 4 cycle, Tecumseh or Briggs or China engine ??

Without knowing it's pretty hard to tell you if it's adjustable. Have you tried reading the manual ?? Did you try asking a dealer ??

Most newer machines do not have any adjustability as to fuel mixture. It's strictly an emissions issue. Many are so lean they won't run properly without being full warmed up before taking the choke off and some will still need a little choke to keep from surging. If you look on youtube you can see many cases of it. If you bought it new you can take it back and have them replace the carb and hope it's better. If you have some skills and are willing to buy miniature drill bits (I did) you can take the carb apart and gently drill out the brass main jet to get some more fuel in there. This is also a procedure you can find on youtube.

Could be a number of reasons
1-your main jets are too big
2-float level to high
3-blocked exhaust
4-points or CDI(please confirm)
5-carb manifold rubbers leaking

Please get back especially No4*

clean fuel line and carburator out real well with a good quality carb cleaner this should do the trick,take the carb apart to do this check needle valve where gas comes in to the carb bowl it is alot of times plugged up

Just a thought, At first I would suspect low cicuit on carb being plugged or mixture passage. But after reading your cleaning carb I would be inclined to say check your timing as long as you are sure your carb is cleaned well and adjusted.

The diaphram is 2 piece's (1 is gasket the other is the dia.) my suggestion would be to bring it to a repair shop and have the carb rebuilt so that everything can be properly set. Besides the jets needing to be set, the needle may need to be reset also. If the dia. was alittle stiff than its going to need a new kit in it. 2 cycle carbs are alittle more finiky than 4 cycle carbs.

Just needs a little TLC: We just bought this heater at Goodwill and it's still in very good condition. The fan wasn't working either, but there was definitely heat. So we took it home and took it apart just to the point where we could give the fan a good q-tip/tweezers cleaning (lots of dust was in there) and then used Penzoil motor high temp grease via a toothpick on the spinning fan axle and voila! The fan works now and doesn't make anymore noise either. Just a note: this is a tedious task that requires an extra hand to help hold things in place since you can't take the fan out completely.