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Saito 150 problems

Old 11-07-2006, 03:43 PM
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reyn3545
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Default Saito 150 problems

I have a Saito 150 that's been running fine. Last time I took it out, however, it just doesn't have the RPM range that it should. It normally turns around 10K RPM with an 18x8 prop, now it only turns about 6500. I can adjust the needle valve in or out about a turn, with little or no change in RPM until I adjust it to the point of starving or flooding. It starts fine, idles great, but just won't get the RPM's that it should... any ideas why?
Old 11-07-2006, 03:48 PM
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Hobbsy
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Default RE: Saito 150 problems

Your tach was playing tricks on you if it said 10,000 with an 18x8 my 2.20 won't do that. 6,500 would be pushing it for that sized prop.
Old 11-07-2006, 06:14 PM
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Default RE: Saito 150 problems

Hobbsy is right I get 9800 to 9900 with a 16X4 wide on my 150 if you were getting those RPMS you may have had it toooo lean and cooked something. Did you ever check your temps on your engine??? also check your valve clearance.
Old 11-07-2006, 06:44 PM
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Default RE: Saito 150 problems

I think I run a 16-8 on my 150? It's around 9200
Old 11-07-2006, 10:08 PM
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Default RE: Saito 150 problems

I think you misread the print on the previous prop... it was probably a 15x8... my 150 does nearly 10K on a 15x8 and 10% fuel.

An 18x8 is WAY too much prop for this engine. A 16x8 makes a very good "all round" prop. Aim for the low 9000's when selecting your prop.
Old 11-08-2006, 11:20 AM
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Default RE: Saito 150 problems

How would an 18x6 work on the 1.50?
Old 11-08-2006, 11:23 AM
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Default RE: Saito 150 problems

That tach could be playing tricks on him. Maybe the light was not correct, etc. etc. How does the plane fly ? Forget the tach, did you have a HUGE drop in performance of the plane, like it not being able to get off the ground ????

If not, then its bad readings.


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Old 11-08-2006, 11:39 AM
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Default RE: Saito 150 problems

I agree with Jett I would borrow another tach. Just to make sure. As far as the saito 150 on prop sizes... For higher speed and sport flying 16X8 to slow it down or 3-D 16x4W. I am getting ready to try a 17x4W on my Funtana 100X. This should be fun. I'll let you know how it performs. [8D]
Old 11-08-2006, 01:27 PM
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Default RE: Saito 150 problems

Ralph, I could find that out for you this afternoon, if you just want to know the bench rpm.
Old 11-08-2006, 01:55 PM
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rmw00
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Default RE: Saito 150 problems

ORIGINAL: Hobbsy
Ralph, I could find that out for you this afternoon, if you just want to know the bench rpm.
Thanks. My 150 seems to run better with the 16x8, but I'd rather run the 18x6. I'm wondering what other's experience is with a 18x6.
Old 11-08-2006, 02:45 PM
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Default RE: Saito 150 problems

Here tis.

Saito High Compression 1.50
Fuel PowerMaster 15%/20% 80/20 blend
Prop MasterAirscrew Classic 18x6
Plug==Fox Miracle
RPM==8,200+
Pic #3==miserable day here.
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