OS 61 FX and Hatori pipe question
07-28-2003 | 09:30 AM
#1
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From: Oslo, NORWAY
OS 61 FX and Hatori pipe question
Thinking about piping my 61 FX. Since all the Hatori vendors in my area are mail order I'm curious about some header sizes and pipes.
1. The Hatori #750 and #751 (short radius) headers... I suspect the short one will fit my aeroplane but what exactly is the radius? In mm?
2. Does these fit the OS 61 FX mounting holes as it does the OS 61 SF?
3. What is the difference between the #650 and #668 pipes? The measurements are said to be the same on the websites but the latter is more expensive. How come?
Many thanks for any help.
1. The Hatori #750 and #751 (short radius) headers... I suspect the short one will fit my aeroplane but what exactly is the radius? In mm?
2. Does these fit the OS 61 FX mounting holes as it does the OS 61 SF?
3. What is the difference between the #650 and #668 pipes? The measurements are said to be the same on the websites but the latter is more expensive. How come?
Many thanks for any help.
07-28-2003 | 01:18 PM
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From: Bournemouth, UNITED KINGDOM
OS 61 FX and Hatori pipe question
I need a reliable engine. Has your OS61 been reliable? Does it dead stick a lot?
Cheers, soz but can't help you with the pipe question I'm afraid!
Try Weston UK Genisis Pipes, they are amazing.
www.westonuk.co.uk
Cheers, soz but can't help you with the pipe question I'm afraid!
Try Weston UK Genisis Pipes, they are amazing.
www.westonuk.co.uk
07-28-2003 | 09:44 PM
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OS 61 FX and Hatori pipe question
Jon,
1. It looks like the 751 should be about 55 ~ 60 mm from the mounting face to the center line of the tube. (Normal OS muffler distance fromt the exhaust face to the center line of the muffler).
Distance between the center of muffler mounting screws on the engine is around 43 mm. If you look at the gasket and draw a line that can be rotated to 90 degrees, you should be able to guess the distance from the mounting face to the center of tube.
750 is pretty long for side mounted engine and I think it is to clear the fuse bottom.
2. Mounting bolts for 61FX center to center on rectangular 4 bolt pattern is 52mm (width) x 25 mm (mounting flange).
I believe SF and FX are still interchangable for mounting.
3. Outside dimensions are same for 650 & 668, but I am not sure the internal baffle differences. Maybe they made 668 a little quieter or more power boost?
Why not use 700?
Hope this helps,
1. It looks like the 751 should be about 55 ~ 60 mm from the mounting face to the center line of the tube. (Normal OS muffler distance fromt the exhaust face to the center line of the muffler).
Distance between the center of muffler mounting screws on the engine is around 43 mm. If you look at the gasket and draw a line that can be rotated to 90 degrees, you should be able to guess the distance from the mounting face to the center of tube.
750 is pretty long for side mounted engine and I think it is to clear the fuse bottom.
2. Mounting bolts for 61FX center to center on rectangular 4 bolt pattern is 52mm (width) x 25 mm (mounting flange).
I believe SF and FX are still interchangable for mounting.
3. Outside dimensions are same for 650 & 668, but I am not sure the internal baffle differences. Maybe they made 668 a little quieter or more power boost?
Why not use 700?
Hope this helps,
07-29-2003 | 06:55 AM
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From: Oslo, NORWAY
OS 61 FX and Hatori pipe question
Many thanks for the measurements! I'll get the ruler and plane out immideately :-)
Dave, on the reliability issue I can say it's the sweetest running engine I've ever owned, but it's not as powerful as I'd like. It's quiet and very reliable, and the only time it's stopped was when I leaned it too much.
It's mounted 45 deg. inverted, and while it does not always start with a hand flip this way it is very predictable -it needs a good prime to start. 5-10 prop turns with finger over carb will give me an easy start each time although the starter is used sometimes. I'm using 10% nitro, 15% synt/castor.
Dave, on the reliability issue I can say it's the sweetest running engine I've ever owned, but it's not as powerful as I'd like. It's quiet and very reliable, and the only time it's stopped was when I leaned it too much.
It's mounted 45 deg. inverted, and while it does not always start with a hand flip this way it is very predictable -it needs a good prime to start. 5-10 prop turns with finger over carb will give me an easy start each time although the starter is used sometimes. I'm using 10% nitro, 15% synt/castor.
