Category: Gy6 valve adjustment symptoms

Gy6 valve adjustment symptoms

See Engine clinic for engine specific repairs. I check mine all the time via comp test and ear IMO I would rather mine loose within reason ofcourse than tight and loose comp and burn a valve. My dad teamhogjust adj. This caused his buggy to not idle properly. He adj. Sometime around the National Bash it started to die when the engine warmed up.

I put up with it until now. After I figured out the cam alignment different cams have different marks on them it was really easy. My intake had a gap of 0. Duh, no wonder it wouldn't idle. I set them both and as Adam indicated it idles like the good ol' days. I was going to take pictures to show how I did it, but I got so excited I had to take it for a quick night time run. I'll probably check it every month or so depending on how much I ride.

These motors are aluminum, and not he best grade aluminum at that so they tend to expand and contract inconsistantly which affects valve lash. I have had my lash change slightly after one days ride or some hot laps on the track.

If you run at higher rpms, 9, above or run the motor hot, degrees plus, the lash can be affected. One or two thousands off can have an effect on how well the motor runs.

I have never heard of a motor granadeing from improper valve setting but a bent valve is normaly attributed to improper lash. You don't have to be all super anal about it but quarterly checks should be done at the minimum. Also, alot of bad idle ,poor performance issues can come from improper valve seating due to carbon buildup. A compression check can show that. Spraying a slight mist of water into the carb inlet while keeping the motor running can clean carbon off the valves if the build up is not too severe.

The water turns to steam which loosens the buildup and gets blown out the exhaust. I discovered I keep the most consistaint setting when I adjust the valves after the motor is warmed up first.

Drive it like ya stole it! For conversations sake, out 4 adjustments a year, how often have they moved? I mean do they change a little every time? Also could tight or loose valves cause engine failier? I mean catastrophic. I bought a used kinroad already had mods on it.

Couldnt test drive it bc final shaft was busted but it started. Sounded bad but I bought it. First I did was to take a comp test its always a starting point for me only 90psi adjusted the valves up to psi It really makes a big diff on throttle respond. Never adjust valves before. Blade 70 with UNI air filter. Tools you'll need: 8mm socket 8mm wrench 10mm socket Small Adjustable Wrench Screw Driver Pencil or other slender soft object Anything else I've forgotten Here's the process I go through: 1.

Remove Passenger Seat a. This will give you a more direct path to the head which makes this job a lot easier.The lash is critical to a healthy running engine. Too much lash will reduce power and potentially ruin the valve.

Rotate the crankshaft a couple times and run the 0. Then try to insert 0. A quick search on Google did suggest 0. I have a QMK gy6 motor does this apply to mine aswell? I have a yerf-dog cc I have spark and its getting but will not start. Do I need to dig deeper into engine?

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John, I had the same problem. I just put in a big bore kit, and cam.

gy6 valve adjustment symptoms

I had spark. And had gas going into the carb. If I remember right, I gave it a shot of starter fluid. And it turned over. Little more looking, and found out that the brand new spark plug I put in, was defective. It gave spark. But not enough. Put my old spark plug back in, and fired right up. Have question of my own. As stated ealier, I installed Log in or Join. Adventure Rider. Dismiss Notice.

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Become a site supporter for a free shirt and ad free viewing. GonzNov 30, Recently had the breakin service done to my GSA. They have done what appears to be the best valve adjustment I have ever encountered. The thing is sooooo quiet and smooth. Now I, being the consumate worry wort, am concerned the valves may be too tight.

The engine is running smooth, plenty of power. It runs normal operating temperature and the economy is fantastic. Overly tight valves cause the engine to display what symptoms? I could always pull my finger out and put a set of feeler guages on them :huh. ADV Sponsors. FonzarelliNov 30, Sound's like the valves are on the money! Contrary to popular belief, it is actually better to have the valves set tighter than looser I would still set at the manufactures prescribed tolerance.

I'm sure you are fine; If you do check with the feeler and find they are slightly tight, I would not worry. I can understand overtight valves to be baaaaad. Valves not fully closing, not being able to disperse heat.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up.

I have a Yamaha XS I want to tune my carbs yes, I know that the B34s are notorious for being lean in the first place. I have attempted adjusting the pilot screw, which did alleviate the popping symptoms and gave me a much smoother ride at 25 mph.

In order to truly tune my carb, I want a better understanding of the symptoms of lean vs the symptoms of rich. Terms often used are: Stuttering Hesitating Running Rough etc etc. In your post you indicate that some of the symptoms you have read are contradictory.

Symptoms of Valves out of spec?

I will try and clarify between the two conditions and attempt to give you guidelines in troubleshooting between the two. Pilot Circuit - small effect on idle. Higher effect at lower RPM's with decreasing effect to full throttle. Main Jet - Wide open. Fuel is metered through the main by the jet needle at different throttle positions. Choke circuit - Initiated by a valve or butterfly that increases the vacuum and opens the circuit up.

Cold starting and warm up. Wide open throttle yields no power. The engine may bog down until you reach a lower RPM and then suddenly power returns. Runs better at higher altitudes - AFR becomes normalized due to reduced atmospheric pressure allowing fuel into the venturi easier.

GY6 Valve Adjustment Guide

Backfires - Popping on deceleration for a lean idle circuit or backfires in general. Runs on choke - The vehicle may run on choke when it's warm but stalls if the choke is turned off. Engine runs hot - Due to more oxygen than fuel combustion temperatures are hotter reflecting on a temp gauge. Hanging idle - The engine idles high and then drops and stalls. Typically a lean condition caused by an air leak between the butterfly and the head or a vacuum line that is not attached. Sharp Odor - The exhaust smell may be sharp and burn your nose.

This is NOx or Nitrogen Oxide. It's created by high temperatures in the combustion process between nitrogen and oxygen.

What Are the Problems Caused by Bad Valve Adjustment?

Although NOx is present in all exhaust it can be more pronounced in higher combustion temperatures associated with lean conditions with more oxygen.

Reduced Fuel Mileage - Your using more fuel per cycle so your mileage becomes worse. Rough Idle - Combustion takes a just a bit longer with more fuel and at lower RPM's the engine can idle rough. Unlike a miss-fire on a spark plug this idle seems fine if the idle is turned up just a bit. Spark Plugs Black - Carbon buildup on insulator and electrodes of plug.

Wipes off your finger as sooty and back. Carbon is a conductor of electricity and getting considerable carbon buildup from a rich condition with ground the inner electrode down the positive insulator. When this condition occurs there will be no spark. You can clean the sparkplug with carburetor cleaner and re-use.Vehicle engines are precision machinery; the movement of many parts must be synchronized carefully to make the engine perform properly.

Intake and exhaust valves are critical components for optimum engine performance. These valves contain mechanisms that must be adjusted correctly to allow for changes in temperature and compensate for material wear.

Running a vehicle with incorrectly adjusted intake and exhaust valves can have a detrimental effect on your vehicle. All of the intake and exhaust valves in an engine must open and close at correct intervals to allow the engine to run smoothly.

These valves have a small amount of clearance between the valve itself and the mechanism that activates the valve. This clearance is called "lash.

gy6 valve adjustment symptoms

Intake and exhaust valves that are not adjusted to open and close at the proper times degrade an engine's ability to make maximum power. Intake valves control when and for how long fuel is allowed into the combustion chamber, and must be synchronized with the speed of the pistons to allow the maximum amount of mixture into the engine. Exhaust valves perform a similar function, except their purpose is to allow burnt gases to leave the engine. If the valves aren't adjusted correctly, the engine will not burn fuel at maximum efficiency.

Power and mileage then dramatically decrease. The most serious result of incorrect valve lash adjustment is damage to the valves and related components. Setting the clearances loosely causes parts of the valve mechanism to hammer together, damaging valves and creating a knocking or rattling sound.

Setting the clearances too tight can prevent valves from completely closing or not closing for enough timewhich may cause extreme heat damage and complete valve failure. Always keep your engine valves adjusted according to the manufacturer's specifications. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.

Damaged Valves The most serious result of incorrect valve lash adjustment is damage to the valves and related components. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

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Photo Credits chrome engine image by Thomas Czeizinger from Fotolia.It's the clearance between the rocker arm and the valve stem.

If it is too large, the valve won't open all the way and you'll get a loud "clattering" noise and if it is too small or non-existentthe valve may not properly close. Either way is a problem. To adjust the valves the engine must be COLD. If it's not cold, the setting will be wrong. Then remove the valve cover. On single cylinder engines there are two valves one exhaust, one inlet. Then follow the instructions in your manual if you're lucky enough to have one that gives them. If not then you can try this.

Put a wrench on the nut holding the center of the fan and rotate the engine until it's at what is known as "Top Dead Center" TDCwhich is when the piston is at it's highest on the compression stroke.

This may be marked with a "T" on the flywheel see image below At this point both valves should be fully closed and the gap between the rocker arm and valve stem clearance should be at its maximum.

Both rocker arms will be at minimum height positions on the camshaft lobes. Check your user manual if you have one.

Symptoms of tight valves

If you can't find any timing marks for TDC you can rotate the engine clockwise the cam lobe is about degrees away from the rocker arm. This means that the clearance between the rocker arm and the valve should be at it's maximum and you should be able to wriggle the rocker arm back and forth a bit that's the clearance. You can also remove the spark plug, put a straw into the cylinder and rotate the engine until you feel the piston is at its maximum height both valves are fully closed note that there are two position in a 4-stroke engine at which the piston is at it's maximum height in the cylinder.

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Be sure you get the right one. Once you're at TDC, loosen the locking nut and adjust the clearance using a set of feeler gauges. When you have it set correctly, tighten down on the lock nut, and re-check it. Now do the same thing again for the other valve. For most cc GY6 engines the clearance should be around. For 50cc engines I've seen. Scooter Focus All about gas powered motor scooters Scooter Focus - Site Map.

Adjusting Valve Clearance - Scooter Focus.Discussion in ' The Garage ' started by HoldenOct 10, Log in or Join. Adventure Rider. Dismiss Notice. Become a site supporter for a free shirt and ad free viewing. Symptoms of Valves out of spec? HoldenOct 10, What would the symptoms be of having a motorcycle with valves out of spec? Joined: Jun 6, Oddometer: 2, Location: morgantown, wv. ADV Sponsors. Bad fuel econamy, poor performance. ZecatfishOct 10, Won't idle or poor idle quality.

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LuciferMuttOct 11, Well, typically they tighten up as the valve seat wears down. This results in poor performance across the entire rev range. Hot starts may get especially difficult. If you have to synchronize the carburetors, you will notice it will be difficult or impossible to get them to sync correctly. Throttle response will be poor and the bike will start stumbling more. In general it's just gonna run like crap. Who cares?

Check and adjust. GrreatdogOct 11, Waayyyyy out of spec.

gy6 valve adjustment symptoms

PalakOct 11, Joined: Dec 1, Oddometer: Not to hijack the thread, but are you fairly experienced in syncing carbs? I'm intrigued by your remark re: difficulty in syncing carbs when valve clearances are off spec.


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