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Saito 180td

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Michael Black27/04/2016 17:07:38
54 forum posts
1 photos

hi I havee the above engine in a 1/4 scale cub bought it second hand, I have the instructions but I  can't find on them where the factory default mixture settings are. I would like to set to factory setting and start tuning from there. Any help would be appreciated.



Edited By Michael Black on 27/04/2016 17:08:49

trebor27/04/2016 17:11:53
1644 forum posts
203 photos

Have a look here might give you an idea **LINK**

trebor27/04/2016 17:20:16
1644 forum posts
203 photos

Ooo a twin **LINK**

Michael Black27/04/2016 17:28:36
54 forum posts
1 photos

Ha yes trebor a twin, I already have those instructions it tells the default for the high speed needle but not the low speed thanks for trying though.


trebor27/04/2016 20:07:12
1644 forum posts
203 photos

Just had a look about and couldn't find anything, there is a chap on here called the Engine Doctor or give these a call if your stuck **LINK**

Didn't realise it had twin carbs as well surprise

Jon - Laser Engines27/04/2016 23:14:42
3826 forum posts
149 photos

If its got normal saito carbs I would wind out the slow run until it is flush with the throttle arm and put 2 turns on the mains...actually, who am I kidding? I would just try to start it and see what happened!

Michael Black27/04/2016 23:26:00
54 forum posts
1 photos

Ha yea with you on that started it and it's not bad but doesn't always run on both cylinders. Both high and low ends were quite different for each cylinder, I will sort it just thought if I had a factory spec it would help. cracking looking engine by the way goes realy well in a cub. It's a twin carb with air bleed different to the normal carbs.

Edited By Michael Black on 27/04/2016 23:31:33

Jon - Laser Engines28/04/2016 08:37:17
3826 forum posts
149 photos

ohhh an airbleed. In that case set the screw so that it half blocks the hole and go from there. I use that as my basic rule of thumb. If a cylinder is dropping is usually tuned wrong, has a naff plug, or the compression/valve clearances are not wonderful. As you have a twin carb setup you should be able to tune it up nicely

Engine Doctor28/04/2016 08:39:21
1967 forum posts
19 photos

Hi , I don't know of a default setting as such but a good starting point for the low end mixture can be found as follows. Make sure the valve clearances are set and equal on both cylinders . Also check that throttle linkage between carbs is set so thst each carb is fully closed and opens identically.Open top end mixture 2 to 2 1/2 turns. Now attach a clean length of fuel tubing to the fuel nipple a foot or so long. With the throttle closed blow down this tube while screwing in the low end idle mixture screw until you can't hear any air escaping. Be careful not to over tighten screw but screw in just enough to stop air escaping. Continue to blow and open the screw until you can just hear air escaping. Both cylinders should be set to this stage before running engine This is a good starting point for tuning. Now start engine and tune both carbs for top end performance . Now tune the bottom end/idle mixture screws . Take your time and only adjust mixture by tiny amounts. You may find that one cylinder needs a different setting due to mechanical differences or wear but this should be minimal. Hope this helps .

john wright 1817/04/2018 13:05:46
3 forum posts

i have a Saito 180 in my 1/4 scale Precedent Stampe it seem to use a lot of fuel any help would be appreciated i did find a bit about it as the fault indicated it could be the low end setting of the carb but now i need to find the topic i cant find it thanks in advance for any help

robert chamberlain12/07/2018 02:14:28
67 forum posts

Saito 72 four stroke question. Don't know where else to post it. A couple of years ago there was an article in RCM&E about case venting. As I recall, it stressed a rather short length. If I need to vent the case I would need about 6 inches to get it out of the cowling. Anyone ever put this engine in an ARF Cub 40? The cyl is mounted at the 7o'clock position. How much oil really comes out of this vent anyway? Should I pump after run oil into this? If the front bearing is sealed that would be a problem, won't it? ----------any thoughts? Bob C

Denis Watkins12/07/2018 04:43:03
2800 forum posts
139 photos

Hi Robert, ALL the 4 strokes which vent, drop about a teaspoon full of oil inside your cowl, which is very messy after a while.

it will flow out via gravity downwards through fuel pipe over 6 inches.

the front bearing makes no difference to oiling, and you can put after run in the crankcase through the vent.

With an OS52 in my ARTF40 Cub, flys more than adequately, so the very powerful Saito 72 would be overkill and wasted in this model

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