I need to know the adjustments after rebuilding carb. on HONDA ATC 70. Thanks J Spencer

sounds like still a carb problem probably need to rebuild

https://www.hondapartshouse.com/oemparts/p/honda/16100-957-073/carburetor-assy

If it has good spark why wouldn't you look at the fuel system?

Back fire is either a mechanical or an ignition timing issue. There is always a gasket between the intake and the carb.

most of those little hondas are 2thou inlet 3 thou exhaust

Bike Bandit has everything you need to rebuild the carburetor on your 1983 Honda VT500FT V-Twin Ascot, click on the link below to view

http://www.bikebandit.com/houseofmotorcycles/1983-honda-motorcycle-vt500c-shadow/o/m9690

google it..

Both carbs have the same jets and should be the same .Now the main jet will have the biggest hole in it ,the compensator jet will have the medium size hole the other jet will be the idle jet so it will have the smallest hole .Now i havent seen one of these carbs but the main jet should be the one that has a passage that runs directly into venturi and the compensating jet should be in the same body/housing and in the base of this housing is another jet /restrictor where the petrol comes in .The mixture is only adjustable on idle by means of the air screw ,which is normally adjusted to one and a half turns out but dont overtighten it before unscrewing it ,then it can be be adjusted in or out a bit for the best evan idle ,but officially its supposed to be less than 2.0 CO2 but they do get checked on the inspection here in in spain

Lets assume that your air filter is clean and the gasoline is fresh (i.e. not more than a couple months old). I have heard a lot of complaints about the carburetor on the Honda 160 cc engine. Some of the folks that have bought mowers with Honda engines have taken them back during the warranty period to Home Depot for exchanges to brands with Briggs engines. If it is outside of the warranty period, find a reputable shop to rebuild the carb.

Here's the deal. The only way gas can be leaking out the carb is because of a float problem. Only six things can create the problem.

• Gas is getting into the float and is stopping it from actually floating.
• The rebuiler forgot to put the float needle back into the carb.
• the rebuilder bent the float level adjustment tang far enough out of range that the needle valve can't close.
• Many floats have a needle retainer clip that actually holds the needle loosely to the adjusting tang. If the clip was lost the needle can jam at an angle and not be able to close.
• The rebuilder left out the float mounting pin or the pin is bent or not installed correctly. The float must be loose on the pin once the assembly is in place.
• The rebuilder left out the float mechanism entirely. This is not very likely.

It might be possible that the mainjet or mainjet 'O' ring was left out and that might cause the problem. I have never seen this before but I just want to cover all, ( even remote ), possibilities.

You paid for the rebuild so I would take the carb back to the rebuilder. You might want to call a Honda dealer's parts department and ask if the parts diagram for the carb shows a float needle retainer clip. Also ask the cost of a " carb kit " Now. if the rebuilder says there is no clip on that carb, you can argue the point.

I wish I could be there with you. Get your money back for the "rebuild" ( less the cost of the carb kit ), and have the dealership fix it. I really want to know what you find out on this problem. Please post a comment on the results.

Please rate this answer after the problem is found. Thanks Chris.