Piston To Valve Clearance Info : Helpful For Scooters, Motorcycles, & More

Information about piston to valve (P2V) clearance. What is P2V clearance? What affects it? How can piston to valve clearance be changed?

The information in this video is relevant to many four-stroke engines, with specifications intended for small engines like scooters and motorcycles. Larger engines, like V8s will generally use larger clearances, for example 0.080" intake and 0.100" exhaust, but the other information should be useful for most applications.

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[brandonquenneville]

thanks man.. seriously, this is nice of you to post secrets of the pros

[rmztwofifty]

Accurate and supportive information relayed here!

[LookingMercuryD]

Now i see why is better adjust valves with Stop engine, we can damage the piston or Valves while we adjust it.. Good explanation

[DIYTech]

Have been in valve clearance thingy from a week since i open my bike head for the first time. You video cleared two of the major questions for me Crystal clear. Why we need to adjust valve clearance and why the piston should be should be inserted in the right way ( which side should be up and and which side should be down on the exhaust side.
SO thanks alot

[sadashivphulzalke]

I can't understand English but gasket solution working good

[longtattat]

How many degrees is the base of the exhaust valve open and closed? and how much is the valve open and closed?

[Adikxx]

How would set zero lash on all valves in a bike with shim type valve adjustment? Would i need to buy thicker shims and insall them under the buckets just for this clay test?

[pisotvph.]

my honda xr 150L intake tappet valve clearance is .08mm and exhaust is .12mm(standard).. i brought it back to my dealer for a tune up at 12k km odo. they adjust the intake to 0.10mm and ex 0.12mm . any this adavantages for not following the standard clearance?

[dedeabsrn]

For gy6 50cc, valve adjust suction how many mm. How many mm of exhaust. must be

[rkzmotovlog]

Do you recommend a performance cam for my 200cc push rod engine? I am planning to upgrade my motorcycle, but I actually afraid to destroy the engine. Pls help me, If you recommend performance cam, what is the best size? The available in the market here in the Philippines is 6.5, 6.8, 7, and 7.2, pls help me

[Adikxx]

Do you know what are the safe recommendations for PTV clearance on bike engines bud? Just finished my build and i'm 2mm of clearance both on intake and exhaust valves. Hope that's safe enough..

[junaidkamal]

What happen if exhaust valve is a bit loos or a bit tight, pls clear the both situations.

[sophialaspuna]

Sir... id like to ask i change my piston frm 52mm change to 57mm piston is thier any problem if my cylinder head chamber is stil original or should i bigger my chamber into 57mm size... thanks you sir more power

[DelandaBaudLacanian]

shouldn't it be 0.005" instead of 0.050"? I'm just learning this stuff and I've seen 0.005 everywhere else..

[cliverennison]

I just did a valve adjustment and now I have oil spewing out of inbetween the rocker arms, any ideas what's happened and what I need to do to fix it please?

[arielmelon]

Sir good morning I'm Filipino may I ask if there is a advance cam...to motorcycle ? Tnx

[T_SXY.]

bro i have decarbonized my engine head and changed both valves, also cleaned carburator. but now iam not getting mileage. there is no sound from engine and it starts and runs smoothly the only issue is iam not getting mileage as i used to get. the mechanic have even tuned the carburator. i dont know whats the issue. pls help. honda unicorn 2013. 45000+ kilometrs. current mileage is like 38 km below . i used to get around 50 before. pls answer if u know.

[thijsiphone]

is it true that i get more power from my engine if i make the valve clearance lesser? because i have a really thick head gasket in my gy6 engine now so i know for sure that the clearance is a lot more that you sayd it should be in the video. i have a 72cc with a9 cam you think it is worth the efford? thanks .

[johnerentv]

I dont think modifying the piston can help, it can cause slight vibration to the engine.

[KIDLATBUHAWI]

my honda xr 150L intake tappet valve clearance is .08mm and exhaust is .12mm(standard).. i brought it back to my dealer for a tune up at 12k km odo. they adjust the intake to 0.10mm and ex 0.12mm . anny disadvantage for not following the standard clearance?