How to: Set the Valve Lash on a 4 stroke engine

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How to: Set the Valve Lash on a 4 stroke engine

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Күн бұрын

I demonstrate my method for setting the valve lash on my Saito 50. Now this method can be used on any 4 stroke RC engine. The principles are the same.
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Пікірлер: 18

@michaelchristopher2939 4 жыл бұрын

I thank you for putting up this video. After watching a bunch of your videos, it has given me the confidence to rebuild my saito engine. Thanks again !

@felippejonsson6078 4 жыл бұрын

Thanks for putting this up, learned alot. I have two saitos to set the valve lash on.

@PeteSztencel 8 жыл бұрын

Very nice: clear, practical, and helpful. Good lighting, too. My oldest Saito is over 25 years old, still runs like new. Fine engines. Re valve gaps: the little blue steel feeler supplied by Saito is 0.1mm, the maximum recommended gap (i.e. if it fits, the gaps need adjusting). It's just a warning gauge, really. They recommend (as you do) a gap of 0.03mm as a minimum (0.002"), which works very well. One other quick point: I like to use the short leg of the Allen key to adjust, and hold on to the long end whilst tightening the lock-nut. A bit more leverage makes it easier to stop the gap adjustment from changing as you tighten the lock-nut. Great videos - thanks for posting!

@rtoebak76 5 жыл бұрын

Very good explanation. This helped me out a lot. Should it always have thight compression even with no carb on? I will check later but if throttle is wide open on my normal nitro engines it turnes over much easier.

@dmrcflyr2 5 жыл бұрын

A four stroke head is a sealed chamber unlike a 2 stroke engine. So yes it can and should have compression without a carb installed.

@rtoebak76 5 жыл бұрын

@@dmrcflyr2 Thank you David. I just bought a plane with saito 91 and it turns round to easy. I will check the valves and otherwise disassemble it totally. Owner says it runs fine. Turning over my thundertiger 15cc is way harder.

@dmrcflyr2 5 жыл бұрын

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@nealjag3917 7 жыл бұрын

thank you buddy

@tomepixel 6 жыл бұрын

David, What advantage is there to setting valve lash to 0.04 vs 0.1 mm, curious .

@gah515 5 жыл бұрын

Thanks for the informative vids. I had been using the supplied .1 gauge that came with my Saito 125 and setting it tightly to that but I ordered some feeler gauges and will set it with a .03mm so it’s just nipping at it as you describe. Don’t know why they supply a .1 as that would adjust a slightly large gap than ideal.

@dmrcflyr2 5 жыл бұрын

You can use it as a 'no-go' gauge by simply setting the lash so that it does not pass through, but will still enough gap that you can feel movement on the arm.

@miadulislam9469 6 жыл бұрын

I want to use this engine for my rc ship. But problem is, this engine's rpm is very high. How i can reduce the rpm? Please give me a suggestion...

@rtoebak76 5 жыл бұрын

If the valve lash is to big, can you lose compression that way?

@dmrcflyr2 5 жыл бұрын

More likely to feel a loss of compression if the lash is set too tight. Too tight and the valves overlap open and thus a loss of compression is felt.

@davesaldana7263 6 жыл бұрын

Hi Dave I have a Saito 180 that constantly wants to run backwards do you have any suggestions

@dmrcflyr2 6 жыл бұрын

Can you provide a bit more information? I have never had an engine run backwards when using an electric starter. So you must be hand starting. Are you bump starting or rotating CCW? How are you priming the engine? I would need to knwo the exact sequence of events you are doing because the issue lies in your method for starting.