saito 72 WONT RUN

rede2fly · 06-24-2006, 07:33 PM

hey guys i have run into a problem i have never seen, or couldnt fix unitl now. ok i got this saito 72 off this guy looks new. it wont run for over 1 minute. it starts great and good compression, no blow by at all. its as if its too rich on the low end. if you take the glow driver off it stops. heres what i did. put new osf plug, new tank , new lines and tryed again same thing, so i started to lean out the low end to try and get it to idle without the driver. after the low end was off it would still start but not idle so i closed the high needle as well just see if it would run, and it did. so i pulled off the carb disassembled to see what was going on. all looked good so a good cleaning and put back togatherand tryed again. oh yea all this time iam using coolpower 30% heli. same problem this motor just wont run. i checked the valves and are dead nuts on. the motor is mounted on a profile so you know where the carb is in relationship to the tank. to me the tank out is lower than the carb, but should not matter. what gives has anyone seen this before i know i shure havent. ive never had a problem getting a motor to run until now. HELP IF YOU CAN

Vic3D · 06-24-2006, 07:56 PM

Actually I think it does matter that the tank is lower. I think it should be on the same lever or higher than the carb.

last12know · 06-25-2006, 02:58 AM

Saito's are really good at drawing fuel from the tank so the posistion is important but not critical. The low speed needle should be just below the throttle arm and you should make sure the motor is not getting to hot from running lean. After you set the idle set the high speed needle using a tach(its hard to tell max RPM on a 4 stroke) and then fine tune the low end again. This guy has an awsome site for saito engines http://saito-engines.info/throttle_setup.html
You should be able to find some help there.

rede2fly · 06-25-2006, 10:28 PM

thanks ill check it out. i own several saitos and have never had a problem until now.

rede2fly · 06-25-2006, 10:42 PM

good site, but ive done all that with no success. ill probly buy a new carb

Mark Davis · 06-25-2006, 11:49 PM

Sounds like the motor IS new... The factory low end needle setting on Saitos is VERY rich and one symptom is that it won't run at this setting without the glo igniter...

The manual says to run the engine this rich for the first 20 minutes below 4000 rpm... Then you can start to lean the low end... YOU DON"T NEED A NEW CARB...

It takes Saitos at least a gallon to even start to break in... They really come into their own after two gallons have been run through them...

Patience grasshopper, patience...

MrKiwi · 06-26-2006, 12:50 AM

Are you using a fourstroke plug?

**Boulder** · 06-26-2006, 07:57 AM

	Quote: Originally Posted by deadstickpilot
	Are you using a fourstroke plug?

Yep he is, an OS Type F

**Toro** · 06-26-2006, 10:31 AM

something is obviously extinguishing the fire... The igniter is keeping the plug hot, I agree with Torqued low end is way to rich. Lean it out on the low, and richen it on the high.

Its not the motor just the mixture, If it runs with the igniter, it wants to run. Gonna take some fiddlin', and who knows what the last owner did.

rede2fly · 06-27-2006, 11:01 PM

tryed that no change. if both needles are closed and motor is still runs , to me something is wrong in the carb. (nothing open means no fuel) saito says lowend should be out apx 4 1/2 turns, and at this setting its blowing more fuel out than its burning. on this motor. i ordered a new spray bar and neddle. the old gent my have cranked down on the high needle and damaged the seat. at least that what iam betting on. he told me this motor was never flown only bench run, and it looks it. i fueld the tank and closed the carb , blew on the exhaust feed to the tank and the fuel was pouring out. and this was with both needles closed. man 30% is nasty tasting, but my heart felt better ha ha. after i get the needles from horizon i will install and try again . will let you guys know what happens. thanks for the help. has anyone ever damaged a lowend seat??

Ramz · 06-28-2006, 12:11 AM

Make sure your using fresh fuel. It could be older fuel that has been exposed to open air for too long...so the fuel could have gone bad.

MrKiwi · 07-01-2006, 01:25 PM

	Quote: Originally Posted by Ramz
	Make sure your using fresh fuel. It could be older fuel that has been exposed to open air for too long...so the fuel could have gone bad.

Fuel goes bad?

06-24-2006, 07:33 PM	#1 (permalink)
rede2fly GRAVITY SUCKS Join Date: Jan 2006 Location: florida Posts: 2,257	saito 72 WONT RUN hey guys i have run into a problem i have never seen, or couldnt fix unitl now. ok i got this saito 72 off this guy looks new. it wont run for over 1 minute. it starts great and good compression, no blow by at all. its as if its too rich on the low end. if you take the glow driver off it stops. heres what i did. put new osf plug, new tank , new lines and tryed again same thing, so i started to lean out the low end to try and get it to idle without the driver. after the low end was off it would still start but not idle so i closed the high needle as well just see if it would run, and it did. so i pulled off the carb disassembled to see what was going on. all looked good so a good cleaning and put back togatherand tryed again. oh yea all this time iam using coolpower 30% heli. same problem this motor just wont run. i checked the valves and are dead nuts on. the motor is mounted on a profile so you know where the carb is in relationship to the tank. to me the tank out is lower than the carb, but should not matter. what gives has anyone seen this before i know i shure havent. ive never had a problem getting a motor to run until now. HELP IF YOU CAN __________________ dont tell me how to do it....... show me how FLORIDA FREESTYLE AEROBATIC ASSOCIATION

06-24-2006, 07:56 PM	#2 (permalink)
Vic3D Mother Huckin' Join Date: Jan 2006 Location: Caguas, Puerto Rico Age: 22 Posts: 3,242 Awards Showcase Total Awards: 3	Re: saito 72 WONT RUN Actually I think it does matter that the tank is lower. I think it should be on the same lever or higher than the carb. __________________ Proudly Sponsored by: QuiQue's Aircraft Co. Troy Built Models Aerohobbies B&E Graphics Jersey Modeler Aircraft International

06-25-2006, 02:58 AM	#3 (permalink)
last12know Dsylxeics untie!!! Join Date: Jan 2006 Location: LA, Lower Arkansas Posts: 87	Re: saito 72 WONT RUN Saito's are really good at drawing fuel from the tank so the posistion is important but not critical. The low speed needle should be just below the throttle arm and you should make sure the motor is not getting to hot from running lean. After you set the idle set the high speed needle using a tach(its hard to tell max RPM on a 4 stroke) and then fine tune the low end again. This guy has an awsome site for saito engines http://saito-engines.info/throttle_setup.html You should be able to find some help there. __________________ Some people are like slinkies.....they're not really good for anything; but they still bring a smile to your face when you push them down a flight of stairs.

06-25-2006, 10:28 PM	#4 (permalink)
rede2fly GRAVITY SUCKS Join Date: Jan 2006 Location: florida Posts: 2,257	Re: saito 72 WONT RUN thanks ill check it out. i own several saitos and have never had a problem until now. __________________ dont tell me how to do it....... show me how FLORIDA FREESTYLE AEROBATIC ASSOCIATION

06-25-2006, 10:42 PM	#5 (permalink)
rede2fly GRAVITY SUCKS Join Date: Jan 2006 Location: florida Posts: 2,257	Re: saito 72 WONT RUN good site, but ive done all that with no success. ill probly buy a new carb __________________ dont tell me how to do it....... show me how FLORIDA FREESTYLE AEROBATIC ASSOCIATION


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06-25-2006, 11:49 PM	#6 (permalink)
Mark Davis Drag it in the dirt... Join Date: Jan 2006 Location: Katy, Texas Posts: 460	Re: saito 72 WONT RUN Sounds like the motor IS new... The factory low end needle setting on Saitos is VERY rich and one symptom is that it won't run at this setting without the glo igniter... The manual says to run the engine this rich for the first 20 minutes below 4000 rpm... Then you can start to lean the low end... YOU DON"T NEED A NEW CARB... It takes Saitos at least a gallon to even start to break in... They really come into their own after two gallons have been run through them... Patience grasshopper, patience... __________________ I'm strong to the finish, cause I eats me Spinach...

06-26-2006, 12:50 AM	#7 (permalink)
MrKiwi Obama 08!!!!!!!!!!! Join Date: Feb 2006 Location: San Jose, California, United States, North America, Earth Posts: 2,338 Blog Entries: 2 Awards Showcase Total Awards: 1	Re: saito 72 WONT RUN Are you using a fourstroke plug?

06-26-2006, 10:31 AM	#9 (permalink)
Toro Sleepy's step and fetch Join Date: Jan 2006 Location: Chino Hills, California Age: 36 Posts: 2,272 Blog Entries: 1 Awards Showcase Total Awards: 1	Re: saito 72 WONT RUN something is obviously extinguishing the fire... The igniter is keeping the plug hot, I agree with Torqued low end is way to rich. Lean it out on the low, and richen it on the high. Its not the motor just the mixture, If it runs with the igniter, it wants to run. Gonna take some fiddlin', and who knows what the last owner did.

06-27-2006, 11:01 PM	#10 (permalink)
rede2fly GRAVITY SUCKS Join Date: Jan 2006 Location: florida Posts: 2,257	Re: saito 72 WONT RUN tryed that no change. if both needles are closed and motor is still runs , to me something is wrong in the carb. (nothing open means no fuel) saito says lowend should be out apx 4 1/2 turns, and at this setting its blowing more fuel out than its burning. on this motor. i ordered a new spray bar and neddle. the old gent my have cranked down on the high needle and damaged the seat. at least that what iam betting on. he told me this motor was never flown only bench run, and it looks it. i fueld the tank and closed the carb , blew on the exhaust feed to the tank and the fuel was pouring out. and this was with both needles closed. man 30% is nasty tasting, but my heart felt better ha ha. after i get the needles from horizon i will install and try again . will let you guys know what happens. thanks for the help. has anyone ever damaged a lowend seat?? __________________ dont tell me how to do it....... show me how FLORIDA FREESTYLE AEROBATIC ASSOCIATION

06-28-2006, 12:11 AM	#11 (permalink)
Ramz Flying Circles Join Date: Jan 2006 Location: New Brunswick, Canada Age: 27 Posts: 294	Re: saito 72 WONT RUN Make sure your using fresh fuel. It could be older fuel that has been exposed to open air for too long...so the fuel could have gone bad.

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