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Old Mar 27, 2015, 05:55 AM
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Canada, ON, Vaughan
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How to measure RPM on new Saito 62A

This is probably a stupid question, but I'm getting ready to break in my new Saito 62A and the instructions say to keep under 4K RPM for the first 10 minutes. Easy enough if you can measure the RPM, but how do you do that? Do I need some special piece of equipment?
This is my first 4-stroke engine ever.

TIA

Andrew
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Old Mar 27, 2015, 06:33 AM
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You need a tachometer, both for the break in and tuning the high speed before you fly. That first 10 minutes is with the throttle between 1/4 and 1/3rd open. I have a procedure I follow that worked about 35 times on Saito break in. I run the engine at 10 minutes at
4,000
5,000
6,000
7,000 then top off fuel and then run at varying speeds between, your choice and full throttle. Set needle somewhere in this procedure. Lots of help available here from sperienced guys. The .62 is a sweetheart of an engine The reason I do it this way is because the Horizon instruction are non existent beyond the 4,000 rpm.
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Old Mar 27, 2015, 06:37 AM
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There are some good choices here, I use this one but its 89 bucks and reads exactly the same as the GloBee.

http://www3.towerhobbies.com/cgi-bin...RCH=tachometer
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Old Mar 27, 2015, 07:20 AM
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Yeah, I've been using the Hobbico tach for at least 20 years. It checks out with the florescent lights perfectly. The figures I get for my engines are consistent with what others get. I've always trusted it and used it for Saito break-in among other things...25 bucks. You should buy one.

Jim
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Old Mar 27, 2015, 07:28 AM
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Thanks so much guys. I'll research the tachs you mentioned and order one.
Back in the day I only ran 2 stroke and never had a tach or anything. Just start it, fast idle for a few minutes, tune and fly.
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Old Mar 27, 2015, 07:31 AM
Back after 30 years
Canada, ON, Vaughan
Joined Mar 2015
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Quote:
Originally Posted by I TOBOR View Post
You need a tachometer, both for the break in and tuning the high speed before you fly. That first 10 minutes is with the throttle between 1/4 and 1/3rd open. I have a procedure I follow that worked about 35 times on Saito break in. I run the engine at 10 minutes at
4,000
5,000
6,000
7,000 then top off fuel and then run at varying speeds between, your choice and full throttle. Set needle somewhere in this procedure. Lots of help available here from sperienced guys. The .62 is a sweetheart of an engine The reason I do it this way is because the Horizon instruction are non existent beyond the 4,000 rpm.
Thanks for the detailed instructions, it sure helps to have expert guidance. I will follow this process.
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Old Mar 27, 2015, 09:12 AM
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One thing you'll notice if you use this method, it won't stay at the rpm you set, for example usually during the 5,000 rpm run the rpm will slowly increase to about 5,500. Don't worry about, it's just loosening up, ring sealing better etc. Some engine do it at different rpm, the Saito 1.00 twin I just got did most of the increasing during the 4,000 rpm run, it only increased about 100 rpm during the 5,000 rpm run.
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