Question about 1982 Yamaha XZ 550

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Would the lack of reed valves stop a zzr600d1 from starting? It's a california model, but has been in the uk for years. The engine cranks over but not catching. The bike has been stood for several months and was and starting ok before.

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  • Yamaha Master
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It cud cause its a carb extension--however thinc electrical 1st-the weakest link-is batt @12v volts n r connecs tite-do plug n wires hav wear--r u gitten proper gas flow and isit still good

Posted on Feb 01, 2010

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Does a ***** boy 50cc have a reed valve? Bike


Hi first thing what is the bike second thing is the engine a 2 stroke, if it is 2 stroke it most prob. has a reed valve, check that the carb needle valve is working as it should, then drain the cylinder and crank of fuel check the plug sparks, leave the carb off and put a small amount of petrol in it, try and start it if it fires once or twice, then it should start with the carb on it, if not there is a problem with the carb. good luck.

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1 Answer

2003 kx250 why my reed petals keep going bad?


A reed valve in a 2 stroke engine is basically a way to prevent the fuel/air mixture from being blown back into the carb. If yours keep failing, the most likely reason is that you have bought cheap reeds. There should also be a reed valve support on the carb side. this is to stop the valve from vibrating and bending the wrong way.

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1 Answer

I have a SMITH aircompressor with a 460 7.5L engine it around a 1980 year model the carb needs to be rebuilt where can i get a rebuilt kit for it?


I worked for a tool rental company while attending college and learned a great deal about engine /compressor combinations. AOSmith compressors used mainly ford engines to power their reed valve compressor head. The mechanic would use off the shelf carbs from local auto parts store. I would recommend that you remove the carb looking for an id tag or numbers stamped on the carb body to cross refrence it for rebuild kit or just exchange. The carb will not be for a 460 engine however. Since 1/2 of the engine is used for pumping air, the carb will be for an engine of lower displacement. We also rented a brand called Lindsay that used a Chrysler eight cylinder engine with their own design of reed valve head. These compressors would work pretty well untill the reeds started leaking, causing the engine to labor. Easy test, with engine off apply compressed air to discharge port (100psi), with cover removed from compressor head, listen for air escaping past reeds. Repair as needed.

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1 Answer

I have a Simplicity model 1692762 with a 16hp Briggs and Stratton. The mower blew large plume of white smoke three times while cutting grass over a period of 10 minutes. Engine seemed to lose some power...


I suspect an internal engine issue such as a valve, the white smoke was oil and it could mean a bent, burned valve or damaged valve seat causing the valve stem seal to leak allowing the engine to **** some oil and burn it (the white smoke) and now you lack compression. It is less likely but possible the oil was overfilled and you "lipped" the piston which causes the compression to drop. check the compression, 100-120 is normal, less than that means bad internal parts.

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1 Answer

1994 Geo Prizm LSI running one day won't crank next day


turns over and crank are the same thing,
so you are saying it does crank over but no start,right?
you need to determine if you have at least 50psi of fuel pressure in fuel rail at reed valve.

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2 Answers

How can we check the ignitor and coil ? what are the specs?


What engine do you have? You could still hear your fuel pump running but if you haven't checked the fuel pressure you may still have a problem with your fuel pump. You should be around 38 to 44 PSI when key is turned on not running. Did you verify you are getting spark or is there nothing to the plugs? Your ignition coil resistance should be (cold 9000-15,400 ohms) Primary should be .36-.55.
Your pickup coil resistance depending whether you are California or excluding California
California is
cold- pick up coil terminals G1 & G- Ohms 125-200
cold-Pick up coil terminals G2 & G- Ohms 125-200
cold-Pick up Coil terminals NE & G- Ohms 155-250
Ex. California models
cold-Pick up coil terminals G+ & G- Ohms 185-275
Cold-Pick up coil terminals NE+ & NE- Ohms 370-550 ohms
You also need to check air gap between PIck-up Coil & Signal rotor
California is .008-.020
Except California .008-.016

Here are some of the suggestions from Mitchell books:
ENGINE CRANKS BUT FAILS TO START:
*Ensure proper spark exists from ignition system
*Ensure Fuel system performs properly (fuel pump, Fuel filter, Fuel injectors, fuel pressure regulator).
*Check engine compression, valve clearance, valve timing and timing belt (if equipped)
Check airflow meter or MAP sensor and wiring
*Check idle air control valve (if equipped) and wiring.
*Check circuit opening relay and EFI main relay.
*Check STA signal at Engine Control Modual (ECM)
*Check Engine Control Modual (ECM) and wiring.

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1 Answer

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could be anyything, form a crank sensor to a map sensor to a maf sensor, is the check engine lite on?

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Pops back through carb


sounds like a sheared or partly sheared flywheel key -

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