RunRyder RC
 2  Topic Subscribe
WATCH
 1 page 928 views POST REPLY
HelicopterScale Model RC Helicopters › OS 70 SZ-H Motor HELP!! PLEASE!!! In my MD500 fuse
11-24-2006 09:43 PM  11 years agoPost 1
dumbflyer

rrApprentice

Pembrook Pines, FLorida

My Posts: All  Forum  Topic

Ok! I have a OS 70 motor that has been mounted in a scale fuse!! I have tried everything, bit cant seem to get the temp down. I mean she is running in 300 degrees or so. This is my second piston ring. Am I doing something wrong in trying to tune it. She does not idle very well at all it sputters up and down. This is the 3 needle carb. 60B. I have all but put this motor through the window. is there anyone who can give me some tips.

Thanks

PM  EMAIL  Attn:RR  Quote
11-24-2006 09:44 PM  11 years agoPost 2
tim deakin

rrVeteran

gloucestershire uk

My Posts: All  Forum  Topic

what fuel are you using,i have the same set up and never had a problem.

PM  EMAIL  Attn:RR  Quote
11-24-2006 09:50 PM  11 years agoPost 3
dumbflyer

rrApprentice

Pembrook Pines, FLorida

My Posts: All  Forum  Topic

CY wildcat 30

PM  EMAIL  Attn:RR  Quote
11-24-2006 09:58 PM  11 years agoPost 4
tim deakin

rrVeteran

gloucestershire uk

My Posts: All  Forum  Topic

wow???
you have lost me,are you running it as rich as possible?with 30% fuel (even with a 70size)there should be a bucket load of smoke?
sorry for stating the obvious!
what glow plug are you using?
it sounds like your low idle needle may be to lean,have you tried puttig it back to factory settings?

PM  EMAIL  Attn:RR  Quote
11-24-2006 10:02 PM  11 years agoPost 5
tim deakin

rrVeteran

gloucestershire uk

My Posts: All  Forum  Topic

also what exhaust are you using? and how have you routed it?

PM  EMAIL  Attn:RR  Quote
11-25-2006 12:56 AM  11 years agoPost 6
dumbflyer

rrApprentice

Pembrook Pines, FLorida

My Posts: All  Forum  Topic

This is what i Have
This is what i have in the scale fuse

PM  EMAIL  Attn:RR  Quote
11-25-2006 03:37 AM  11 years agoPost 7
Tyler

rrElite Veteran

Chicagoland area

My Posts: All  Forum  Topic

60B carb
Isn't the 60B carb from the OS 61 sx WC engine? Why not use the stock OS 70 carb? I have had great results with the stock 70 carb.

Tyler

PM  EMAIL  GALLERY  Attn:RR  Quote
11-25-2006 01:52 PM  11 years agoPost 8
Crewdogg998

rrApprentice

Michigan

My Posts: All  Forum  Topic

I defanitly wouldn't be flying that heli until you find out what is wrong. You may want to disassemble the carb and look for obsructions in the spray bar. Fuel hose is cheap too...does the muffler have a good seal to the engine? Let us know what you find!

PM  EMAIL  GALLERY  Attn:RR  Quote
11-25-2006 02:45 PM  11 years agoPost 9
LBoogie

rrNovice

Sebastian Fla

My Posts: All  Forum  Topic

...
Sounds link bearings to me.

PM  EMAIL  GALLERY  Attn:RR  Quote
11-25-2006 07:07 PM  11 years agoPost 10
tim deakin

rrVeteran

gloucestershire uk

My Posts: All  Forum  Topic

thats a very long extension,i had a similar problem with mine!i routed the exhaust pipe through the scale exhaust which in turn caused back pressure!!which will cause it to over heat. Try a shorter angled deflector.
also it is very good advice off CREWDOGG to check the carbs clean and replace all off the fuel line.
When i get chance i will send you some pics of mine and i shall tell you what my carb setting are at. In the meantime my wife has just gave birth 25/11/2006 to a baby boy called JAY!!!!!!!!!!!!

PM  EMAIL  Attn:RR  Quote
11-26-2006 12:55 AM  11 years agoPost 11
Crewdogg998

rrApprentice

Michigan

My Posts: All  Forum  Topic

Congrats Tim! I'm wondering if your wife would have objected to naming your son "HUEY"?

PM  EMAIL  GALLERY  Attn:RR  Quote
11-26-2006 03:12 AM  11 years agoPost 12
dumbflyer

rrApprentice

Pembrook Pines, FLorida

My Posts: All  Forum  Topic

Well I took the entire thing appart today! I had to change the piston ring!! No compression due to the excess heat. I will be trying it again outside the fuse!! I got rid of that silicon hose and am now in the process of making a custom one from brass tubing. This way I will have a larger dia. for the exhaust to exit. Also there will be no kinking in the brass one!! I feel that I might have tried to bend the hose at too short of an angle and had some kinking going on.
Tomorrow is another day and I will post my results.
Thanks for all the help and tips.

PM  EMAIL  Attn:RR  Quote
12-13-2006 01:41 PM  11 years agoPost 13
guntube

rrApprentice

Marietta Ga.

My Posts: All  Forum  Topic

I had this problem with a 60. Make sure you are not using long runs of thick walled fuel line! The engine will not be able to get enough fuel or exhaust pressure! O.S. engines love the high nitro, but they have to move alot of fuel to stay lubed and cool. I have changed my fuel nipple on my exhaust to a larger size, and run a larger size tubing to the fuel tank. Got to have good steady pressure to the tank or it will lean itself out as the fuel level (tank pressure) drops. Just make sure you are getting loads of fuel to the carb and let the carb meter it. Also, double check those bearings if you have had a lean run (someone said this) sucking air from a bearing will make your needle settings almost impossible, just like every other 2 stroke engine with a vaccum leak. Hope this helps.

Putting divots in the earth the hard way!

PM  EMAIL  GALLERY  Attn:RR  Quote
12-13-2006 02:48 PM  11 years agoPost 14
dumbflyer

rrApprentice

Pembrook Pines, FLorida

My Posts: All  Forum  Topic

Thanks you guys for all you input!!
I think i got it sorted out!!

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 928 views POST REPLY
HelicopterScale Model RC Helicopters › OS 70 SZ-H Motor HELP!! PLEASE!!! In my MD500 fuse
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Sunday, April 22 - 3:28 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online