Throttle connections/sensor mounts?
 

Need help trying to figure out how to hook up the throttle on my walbro/stihl carb on my 88cc.

the lever doesnt screw on or off, so im not sure what to do, plus it has a spring on it.

the choke is spring loaded open, so i might just close it by hand while i flip the prop to suck in fuel, then its spring loaded open...

ill post pics later..

plus i have a hard time with which needle is high and low, as they are not marked..

Help!!!!

Throttle connections/sensor mounts?
 

heres a pic

Throttle connections/sensor mounts?
 

Check on walbro's homepage and find the production number or serial number on your carb and you will find it there. They have blown out drawings and you should find out wich needle is high and low.

Throttle connections/sensor mounts?
 

thats part of the problem! the number on the side of the carb doesnt match to any part number on thier site! even thru the search engine...

Walbro #'s
 

What is the # ?

Throttle connections/sensor mounts?
 

wj69 815

Throttle connections/sensor mounts?
 

maybe a call over visit to local Stihl servicing dealer would help. Spring on throttle can have its 'hook' snipped off and retain the coil part for endplay tension or move the hook to let it catch the next protusion (5 o clock position your pic) This would reduce load on servo but still allow a throttle shutdown via spring if linkage were to come undone.

The existing cable connector hole may be a good place for a Du-Bro swivel ball link (2-56 attach bolt to a 4-40 control rod)

Normally the needle nearest the engine (outflow of carb) is the Low speed adjustment.
H igh I nput - Low O utput HI LO Maybe I can remember with a little aid and not have to edit next time! :D

Throttle connections/sensor mounts?
 

Normally the needle nearest the engine (outflow of carb) is the High adjustment.


Might want to rethink that..
The needle nearest the cylinder is the the idle...the other one furthest out from the cylinder is the high speed needle... :)

The last time I had a linkage like that, had to file off the end of the shaft remove the linkage and put on a steering arm off a landing gear along with a ball link in the arm...
Or you can clean the arm off good with sandpaper, solder a washer over the big hole in the linkage with silver bearing soft solder and drill it for a ball link...I have a Ryobi 31 like that and it hasn't come loose yet...Knock on balsa..

2 centavos worth..

Throttle connections/sensor mounts?
 

BigBird1:
Yes, I misstated, the location of High Speed. It is the Low Speed that is closest to the outflow of the carb. I disregard the idle stop screw. (Edited the prior post) :stupid:

A little off subject but this adjustment description has helped me:
http://www.bmeengine.com/BMEdocs/BME_Instructions.pdf

Maybe that's why I take so long to adjust carbs!! :D


BBI: Could you elaborate on the Ryobi carb link? This one has marine-tex end and redrilled hole for the 2-56 bolt.
http://www.rcuniverse.com/gallery/sh...hp?photo=17484

Throttle connections/sensor mounts?
 

Maybe that's why I take so long to adjust carbs!! :D

Hey, I did the same thing on my first gasser.. :(

BBI: Could you elaborate on the Ryobi carb link? This one has marine-tex end and redrilled hole for the 2-56 bolt.


I'll see if I can take a pic of it tomorrow and post it...
Just used a standard Dubro ball link and a washer soldered to the throttle arm...
Somehow the one I got had a BIG hole in it and rather than take off the linkage, I did it that way...

Throttle connections/sensor mounts?
 

Sometimes the throttle pivot rod protrudes the other side long enough to put a control arm on it. Here's one example:

Throttle connections/sensor mounts?
 

Other times you just have to be a little creative in making your throttle connection. Here's another example using a spare Hitec servo arm.

As for the throttle return spring, it's easy enough to unhook it and hook it onto another hole to lessen the tension. I don't bother with the spring at all most of the time, but it's up to you.

Throttle connections/sensor mounts?
 

Same engine, throttle at the other end of travel.

Throttle connections/sensor mounts?
 

thanks for the replies! looking hard at how to do this... but i dont want to mess up the arm..

spring doesnt do much if i unhook to the next arm, not enough tension..

now, if i you guys could tell me how to mount the hall sensor to the engine, my problems will be over! hehe

Throttle connections/sensor mounts?
 

Ya really don't want to have tooo much tension on the throttle linkage....real hard on the servo and lots of battery drain...all of mine have the spring clipped and it is just their to keep the plate from rattling in the throat of the carb.

Show a pic of the front of the motor...

Linkage
 

Let me see if I can squirt this in....

Throttle connections/sensor mounts?
 

i cant really tell a whole lot from that pic...

Throttle connections/sensor mounts?
 

Ron, if you post a picture of the front end of your Husky 88, we might be able to give you suggestions on how to mount a Hall effect sensor. The Husky isn't a familiar engine to many of us, and so unless the crankcase has a round section just behind the prop adapter, it's going to require custom bracketry for sure.

BTW, BB1's picture looks like a Ryobi 31cc mounted on a nose of a Stick type aircraft. The carb is behind the crankcase with a throttle arm facing the photographer.

Throttle connections/sensor mounts?
 

BTW, BB1's picture looks like a Ryobi 31cc mounted on a nose of a Stick type aircraft. The carb is behind the crankcase with a throttle arm facing the photographer. [/B][/QUOTE]


Oh Heck, thought we were still in the throttle thingy". :D

It's a 8' wingspan sorta kinda stick..."Big Eliminator"...weighs in at about 14lbs.

Throttle connections/sensor mounts?
 

yeah, its kinda rounded. looks like flipflops husky 81 he posted.

ill post some good pics, i figured a bracket is needed, but i dont know if theres some do's and donts with regards to the sensor.. like attaching to metal, or needs plastic on top of metal, no zip ties.. etc. ive done searches here, but havent found some good pics of the sensor attachments.... other than 3w type...which wouldnt work with my engine...

i still find that pic hard to pick out exactly how the arm is on there... but i will figure it out somehow. if any more pics out there, please post em! im new to gas, and there just isnt enough conversions around here (that i know of) to ask.

Throttle connections/sensor mounts?
 

It's the original.....just that it's been modified for the ball link..

Post a pic of you're motor and we'll see what we can do for you to get the ignition set up..

Throttle connections/sensor mounts?
 

Ron, as far as DOs and DON'Ts, just make sure the part of the bracket, to which the sensor is attached, is nonferrous - aluminum, brass, plastic, composites, etc. are all okay. The rest of the bracket is okay to be steel. A very common way of securing the hall sensor is to solder/braze/weld a brass channel to a steel hose clamp, then epoxy the hall sensor to the end of that U-channel to pick up the magnet target. Here's a pic of one from the CH Ignition website:
http://www.ch-ignitions.com/image2RD.JPG

Throttle connections/sensor mounts?
 

heres 1 side

the magnet is basically where TDC is on piston, so, subtract 28deg clockwise and that is where to put the sensor/bracket.

volfy, i like the clamp idea, but i dont think it will work for mine... but im glad to know that i can use anything but steel/iron to mount sensor on...now, ideas??

Throttle connections/sensor mounts?
 

other side.

Throttle connections/sensor mounts?
 

Where is the position of the magnet at TDC in relation to the cylinder?

I'm not familiar with this motor, but 28 to 32 degrees BTDC is usual timing..depending on what the motor likes...
The bracket may have to come off the two bolts at the cylinder base...you have the pickup that is like on a G62 and sticks straight at the magnet...
Once you find this position you can start from their with a bracket.