Skipping This Service COULD KILL Your Motorcycle! (Valves Explained)

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[gregerymarshall]

Keep these tech talks tid bits coming. I'd be a great side discussion for the channel.

[kerrykalls]

I did a valve clearance adjustment with zero past experience and a Haynes manual leisurely over a couple weekends in the winter. Triple checked everything I did and kept all bolts in a cardboard cutout that mimicked the valve cover and cams etc. Turned out to be a perfect job and '06 636 still going strong other than needing another throttle body tune 4 years later

[macc]

Just did valves on my xsr700. Took me the whole weekend but felt great to learn some new stuff

[ChrisG]

I think I've had a bent valve for about 8 years and 60k miles now. Marginally less power, makes a noise, but still runs (like a Honda).

[CaffeineFreak]

Mechanic here, 1) spite isnt completely wrong about the valves being bigger and smaller than eachother for the straw reason, cus he broke it down barney style. but the larger factor in the intake valve being bigger is due to atmospheric pressure. 2) When he said shops charge by the hour, he is correct, but that doesnt mean shops get paid for the entire time they work on your vehicle. For the most part there are set labor hours for each job and each vehicle. The cost differences usually come from labor rates which are typically higher in big shops that have larger overhead costs and where they typically do everything by the book to extract every cent they can per job. For example your local dealership is likely to charge more for a job that a small shop would do for less cus their shop is small and it costs less to run

[Clawzz]

As a newer rider, I like these tech segments. Learning about the inner workings of a motorcycle is quite dreading since there is so much going on and information is spread around everywhere.

[cameronduplessis]

I'm studying mechanics at college and this actually helped me get up to speed, cheers guys✊🏍

[nicholassilvestri]

Can I just say, the guys at Suzuki were saints when they put the screw/lock nut valve adjuster on the oil cooled GSXR's and Bandit engines. Takes literally 2 hours start to finish on my B1200

[santiagoardilesgonzalez]

I used to have a 200cc SOHC 4 valve 3 sparks single cilinder. It runs a sweet 10.000 rpm redline.
Man I miss that bike.
It was Bajaj Pulsar NS200 and had the BEST 200cc engine of them all.

[zyonsdream]

Some bikes really require attention to the valves and some don’t. I had 48, 000 miles on my CRF1000 Africa Twin and never touched the valves. Started easy every time, maintained consistent gas Milage, no abnormal noises or smoke. Ran the same from day one. Stock exhaust and filters and I didn’t ping it off the limiter. Bike was awesome until it got binned by a mini van.

[havikhobbies]

Valve clearance exists to ensure the valve closes fully so it can correctly seal against the valve seat. The valve is also cooled every time it seats, transmitting its heat into the cylinder head. If the valve train wears in way that the valve clearance is zero. The valve cannot fully seat in the head. Gasses can bypass causing a possible missfire and it and will overheat because it cannot transfer that heat to the head. A loose valve is a happy valve (until its way loose/loud) diminished clearance caused by lack of maintenance will eventually damage the valves, particularly burned exhaust valves are a common result.

[TheAbhi]

this video came in at a very right time coz i used to wonder why we need to get the valves serviced at some intervals and what is the significance of that, but now i know so thumbs up to the team

[nbayard]

Sucking isn't harder than blowing. The straw analogy is a red herring because it's based on your anatomical limits. It's about pressure differential. Atmospheric pressure is way less than the pressure inside a post-combustion chamber.

[MrEiniweini]

One of the selling points for the Sportster S was that you did not need to service the valves. I know bugger all about engines but I am happy now. I am likely to put over 15, 000 miles a year on it.

[wilremington]

As someone recently into motorcycling, started halfway through last season, this was absolutely perfect for me. I have a 2003 Yamaha FZ1 with 28k miles on it, so these were exactly the questions I've been asking.

[scottarmbruster]

Good job Spite and well explained An excellent episode for those out there getting into bikes and aren’t mechanically aware

[abyssflight]

the valve service interval for my TW200 is only 3, 000 miles but on the other hand it's such an easy thing to do on the T-dub it only takes about 15-20 min.

[riellydoyle]

Absolutely love these type of learning videos. I could literally watch these all day. Keep it up

[StormBringerVids]

I love the technical explanation. I would be curious to see more like this.

[craigbomer]

I had a coworker with an 80's Yamaha 450(I think)cc parallel twin. He put a TON of miles on it and did all his own work (we're mechanics). He told me that the last time he checked his valve clearances, some of them had worn their valve seats so far into the cylinder head that there wasn't any room left for shims! He figures he has gotten his money's worth out of the bike and he'll replace it when it finally gives up.