the Wasp

My Feedback: (1)

cdrc1,
with the 14X7 you are running your Saito 100 in a bit higher RPM range, well there are 3 things to say about that,
A) being a 4St your engine loves to be loaded more than a 2St would, and
B) Saito's are Camed to be loaded more than other brand 4St,
C) a correctly loaded engine is easier to tune, so you may wish to try a 14X8 prop to get your RPM down a bit,

I have seen engines that ran very badly because they were simply loaded incorrectly for the Plug and Fuel that was used in them, and a simple prop change to a larger prop fixed the problem in an instant.
1) engine 1 was a 160 4St with a 13X4 prop on it, the engine would stall as the pilot would come off the throttle to land or as accelerating to lift off, I sold the guy a 15X8 and his problem went away instantly, yet he could have gone to a 16X6 or 8 but no one had one,,
2) this engine was a .61 2St, it had a super light wood 9X4 prop on it, the tow guys worked 3 hours on it and it would stall every time (every time) when the wheels left the ground, I told the guy to put a APC 12X6 on it and he did, problem gone instantly,,

both of these^ engines could have been fixed in a different way, but it was not acceptable to their flying styles, and that was if, if they added a much colder plug and ran fuel with maybe 40% Nitro or higher.

Jim

cdrc1

Thanks Jim; will try it.

Rudolph Hart

Now your talkin jim,40% + nitro doing a big saito engine bench run in the shed at night with the lights out,nitro flames light the whole joint up,which reminds me...i think those fine short white hairs in the fuel may be a hemp based product,true story folks,i just remembered reading that here on these pages years ago.Any suggestions of a possible cross contamination in the shed will be frowned on

Glowgeek

You mentioned that before. Is it an easy retrofit like the 100 carb was?

the Wasp

My Feedback: (1)

well the 125 ID is .008 larger than the 100's,,

here's the 3 ID numbers,,,
82) .315,,
100) .336,,
125) 344,,

but keep in mind that I found the ventures ID's are not totally round, they are slightly oval.
and remember that the 125's Manifold has a larger OD than the 100 and 82..

but, I just found today that the Barrels on all 3 Carbs are interchangeable, so you could put a 125 Barrel in the 100 or 82 Carb, and open up the Carb's Intake venture, I wonder how that would work

boy these Saitos are very interesting engines, the wonders just don't stop with them

Jim

Jesse Open

Did you check the part numbers for the carbs and parts?
Which are same?

the Wasp

My Feedback: (1)

no, but I took the Barrel from the 125 Carb you sent me and put it in my 82 Carb Body, it fits and works well, but I have checked more since my last post and I found that the 125 Barrel will not completely close-off the 82's Intake side of the Venture , I don't know if that will mess with the idle, it's something that needs to be tested

Jim

PatternFlyer

My Feedback: (182)

I was at one of the club field today.
A father & son team brought a GP Sitk with Saito 91.
it has strong compression.
it will fire, but will not stay running anymore than around 5 seconds. It just abruptly stop on idle. It will run with glow ignitor on. New YS 4-stroke plug. Fuel is Cool power Heli 30% (23% oil).
It sounds like only the primed fuel is burning.
It will start at any throttle, but will not run anymore than 5 seconds.
it ran once to full Throttle with glow Ignitor on.

bleeder is not blocked. Valve gap appears to be a little tight, but not sure without feeler gauge,

bearings smooth. Prop is Master Airscrew 14x7 or 14x8.

any idea?

Rudolph Hart

A chart every saito engine buyer should have


Pattern some pics would be good.Have you double checked the fuel line set up?

FlyerInOKC

My Feedback: (6)

You forgot the cardinal rules of airplane purchase, never tell the wife what it cost, and never ever let her see you bring it home. Finally, whenever possible tell her you got it in a trade.

acdii

That is pretty much how the 100 I have ran when I got it. I turned the LSN in all the way, then backed it out the prescribed amount that at the moment can't recall, and it fired off on the first slip and ran great. Ran so good it would not stop running, just sat there popping along at about 600 RPM. I have it in a Cub now and it flys great.

Rudolph Hart

Yes mike if you always told the truth about saito engine purchases to the handbrake you'd look like this.


Pattern if you have double checked the fuel line set and it's all good you could reset the needles to roughly factory spec and re tune it.Wind the lsn back out to nearly flush with the lower bevel edge on the black plastic surround,then wind the hsn in fully and back it out 4 turns.

Captcrunch44

FlyerInOKC

My Feedback: (6)

That is a serious problem!

acdii

Gifts for the daughter, right? RIIIIGHTT?

FlyerInOKC

My Feedback: (6)

Smart thinking acdii!

the Wasp

My Feedback: (1)

no planes for those engines, but you have a bench outside, I see no problem

Jim

Captcrunch44

Glowgeek

Saitos, experience the addiction!

Glowgeek

Gary, been sick with some evil virus since Friday. I'll try to get your package out tomorrow.

Jesse Open

Captcrunch44

Rudolph Hart

Sounds like your drinking the wrong beer.

Captain saito pirate i'm firing a friendly broadside at your sailing warship.You should be getting a lot more rpm than you say,have you checked your tacho? eg; my fa182 twin idles at 1800 and swings a mas 18x6 at 8500 easy on 10% could it be the castor oil i was using?

Captcrunch44

Glowgeek

Or you could check your tach by pointing it at a flourecent light. It should read 3600 rpm. Generally speaking tachs don't really go far out of calibration, they either work or they don't. Mostly failure to read a solid stable rpm can be placed on user error. Trying to read rpm in the shade, under trees on a sunny but windy day, during overcast conditions, pointing into the sun, having a reflective object like a vehicle or building on the other side of the prop or too near artificial lighting sources all can cause unstable or erroneous readings.

i just recently learned about reflective objects behind the prop. I was taching an engine with no problems, shut it off and and friend stopped by. He wanted to hear the engine run so I fired it up but when I tried to tach it the numbers were all over the place. He had parked his truck about 10ft from my test stand. The tach was shooting through the prop and reflecting off his truck causing big problems.