Droski Posted September 9, 2016 Report Share Posted September 9, 2016 hello i have a 1966 520 , it recently started hesitating/ jerking like its not getting enough gas. it will jerk at low and high speeds i already replaced the fuel filters has anyone had similar issues? 1 Quote Link to comment
racerx Posted September 9, 2016 Report Share Posted September 9, 2016 Does the 520 have a carb with a sight glass? If so what is the level? You can also be running lean? What is the color of your spark plugs? Is your rpm steady at idle? 2 Quote Link to comment
racerx Posted September 9, 2016 Report Share Posted September 9, 2016 Also your choke can be stuck 2 Quote Link to comment
kelowg Posted September 9, 2016 Report Share Posted September 9, 2016 Water in the fuel? Clogged tank pickup tube/line? 2 Quote Link to comment
datzenmike Posted September 9, 2016 Report Share Posted September 9, 2016 Spark or fuel. Fuel Next time it's acting up get the clutch in and the key off ASAP and carefully pull over. Check the window on the front of the carb. If full of gas it at least getting it delivered. For now, assume that it's not the gas Spark Check the points. Are they worn or burnt, pitted? File them or replace and set the gap 0.018-0.022". Look for loose connections on the wires to them and on the coil and ballast resistor. Now inspect the distributor cap inside for dampness. Look for wear or corrosion on the terminals inside. Inspect the rotor while the cap is off. Now look at the plug wires and last the spark plugs. If in doubt replace them with new ones. Electricity will ALWAYS look for the easiest path to ground. So you want a well insulated ignition system where the easiest path to ground is through the spark plug! If replacing the plugs use only NGK brand. This will solve most running problems, if not, we'll look deeper into the carburetor. 2 Quote Link to comment
banzai510(hainz) Posted September 9, 2016 Report Share Posted September 9, 2016 put a timming light on there also. Most is a simple adjustment if stock carb that 45yrs old maybe a issue also. convert to a Pertronix ignition 1 Quote Link to comment
Stoffregen Motorsports Posted September 9, 2016 Report Share Posted September 9, 2016 Has the truck just come out of a long slumber? Or do you use it regularly? Could be a fouled distributor cap or bad wires. Does it backfire? 1 Quote Link to comment
Droski Posted October 19, 2016 Author Report Share Posted October 19, 2016 im starting to lean towards the carb on this issue fuel is getting delivered and the ignition system looks to be okay Quote Link to comment
datzenmike Posted October 19, 2016 Report Share Posted October 19, 2016 Ignition is easy... got spark or not. Assume you saw sparks? OK then, this is all good information and points toward the cause. Fuel to the carburetor and spark to the plugs. It would appear that the carb is not properly mixing the fuel with the air. Could be the primary jet is part plugged, sediment or water. Quote Link to comment
banzai510(hainz) Posted October 20, 2016 Report Share Posted October 20, 2016 ck for distributor bushing wear and condenser if still have points. I would cut out above idle to find my condenser was bad, but now have a Pertronix ignition Quote Link to comment
racerx Posted October 20, 2016 Report Share Posted October 20, 2016 Could be running too lean. Have you tried adjusting your idle jet? 1 Quote Link to comment
zed1 Posted October 20, 2016 Report Share Posted October 20, 2016 The Nikki is a good carb for the anemic J13 engine. If you buy a used carb from someone you do not know for certain it is in good condition. Send your Nikki to royze.com for a rebuild. Keith Quote Link to comment
datzenmike Posted October 20, 2016 Report Share Posted October 20, 2016 Idle mixture adjusts.... idle. Anything above idle is the slow speed circuit and the primary. Quote Link to comment
Droski Posted December 14, 2016 Author Report Share Posted December 14, 2016 Okay I think I figured out why it's hesitating when I'm giving it some throttle. Gas is leaking Quote Link to comment
Droski Posted December 14, 2016 Author Report Share Posted December 14, 2016 Time for a rebuild? Quote Link to comment
Droski Posted December 14, 2016 Author Report Share Posted December 14, 2016 Time for a rebuild? Quote Link to comment
Draker Posted December 14, 2016 Report Share Posted December 14, 2016 Most likely.. yeah. Quote Link to comment
wayno Posted December 14, 2016 Report Share Posted December 14, 2016 Time for a Weber. 1 Quote Link to comment
Droski Posted December 14, 2016 Author Report Share Posted December 14, 2016 The Weber haha I know. This Nikki was working great so I'll just stick with it. I'm still running the 4 speed. It's cruiser. Quote Link to comment
wayno Posted December 15, 2016 Report Share Posted December 15, 2016 Does the Nikki have 3 or 4 screws holding the front float glass on? Quote Link to comment
Droski Posted December 15, 2016 Author Report Share Posted December 15, 2016 3 screws im actually trying to identify it as we speak Quote Link to comment
Droski Posted December 15, 2016 Author Report Share Posted December 15, 2016 Does anybody know if this the standard Nikki carb that came with the 66 or is it a slightly newer carb. This one has no electrical parts Quote Link to comment
datzenmike Posted December 15, 2016 Report Share Posted December 15, 2016 First electric choke was '72 521. Not sure when the first idle cut solenoid was but after that. There was nothing electrical on the early 520s. What do you mean hesitates? Describe what happens. Quote Link to comment
Droski Posted December 15, 2016 Author Report Share Posted December 15, 2016 The truck jerks and loses power Like it wants to go but it hesitates then goes. The engine never shuts off. The gas in the carb leaks when pumping the gas peddle I found that out today without having the engine on. 4 pumps and it begins to leak. Quote Link to comment
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