Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Is there a simple way to disconnect the governor arm from the carborator? I've removed the bolts that hold the carb on but it won't slide off (It needs cleaned big time) because the of the linkage to the governor arm (wire rod and spring).  The shop manual says to remove one of the two screws that hold it on, but I'm not sure which one should be removed or what will happen to the governor if I do remove them.  I have heard that governors are really hard to adjust and I was trying to avoid that agrevation.  I've labels the two screws "A" and "B"  (one of them is really a bolt).

friiy wrote:

I have no tach.  Sometimes auto parts stores will loan you things.  The manual says high rpm is 4000 and low rpm is 2000 (is "low" the same as "idle?").  There's also a horsepower rating but that is at a lower rpm like 3200 or so (under load?)  Wow 2000 rpm at idle. That might be about right. What do you think?

The engine RPMs   sound too fast to me too, its not you imagination.  That's why I'd like to adjust that limiting screw.  The screw does not look right the way it is. Its backed out so far that the little spring has no tension. But I don't know my way around those parts.  I do think that the rubber in the fuel line is breaking down and dissolving into the fuel.  I can see some black stuff in the carb when I look in past the choke plate. Not a lot, just a trace.  Where else would that be coming from?  The valve cover has a vent tube that feeds back into the air intake.  Maybe there's oil blowing by those valves. Hard to say.

You can imagine how great it was to hear it start.  The blower is a real beast.  I want to be able to snowblow the sidewalks in my neighborhood and so I will rarely have to turn it.  Until we get a snow I won't know if  was worth the effort.  It turns easier than some wheeled blowers that I have used but it is very heavy.  The blower part sounds like it needs a few new bearings (those are cheap) and I guess I'm going to have to open up the drive system to see why the shifting is sometimes "hit or miss."   In fourth gear it really moves along.  The belts need checked, I always worry that someone puts the wrong belt on.  It was used on a gravel drive so there are some paint issues.  I don't want to spend a lot of time on it until I know that I like how it blows snow.  

Are you sure the RMP (4000,2000) is that auger rpm?

Friiy

Can you send me the link on the manual? or post it..

Thanks,

Friiy

friiy wrote: Yes it shakes. You cannot balance a quarter on this one.  Apparently Yamaha engines are known for vibration issues  when carbon builds up someplace (the cylinder head?) .  The engine is mounted on big rubber bumpers and the fuel tank has its own set of rubber bumpers. I was thinking of wrapping some fine wire around the vibrating arm. I worried I'd wreck something if I started hammering away.  But if you have any ideas I'm game.  The shaking does not send vibration down to the choke plate (not yet anyway.)  If I find a tach, what do I point it at? The shaft coming out out to the pulleys and belts?

http://www.tinytach.com/tinytach/gasoline.php

This is the kind I have used for years, It has a induction pickup wire  you wrap around the spark plug wire ( around the insulation, you dont want to send engien spark down the pick-up wire)

Friiy

friiy wrote: This is from the manual to my snowblower's smaller 6hp twin.  The two engins are very similiar.

What you do with the choke is:

    With a small punch (with the diameter about the size of the float pin) tap the top of the brass shaft of the carb.  Tap just tap hard enough to start denting and moving/ flareing out he brass over the steel choke plate and arm...  After that I would clean the area  with contact cleaner and ruff it up with some heavy Scotch bright  (maroon color).   Clean it again with contack cleaner and put a drop of epoxy  ( like JB weld) on the shaft and plate-arm area.  Just to reinforce the shaft to arm area and to prevent fretting and wear.

   Friiy

Wow,   seems high.. your's is a 8hp?    Where do you see full speed?

You said you saw something on the motor rated at  ##hp @ 3200 rpm or so?

.Friiy

friiy wrote:

Yes mine is 8hp.  Nobody can find the service manual for the 8hp, but the specs for the 6hp is often very close.  The maximum torque (HP?)  for the 6hp is rated at 2800 rpms.  The max RPM is 4000 rpm.

 

My first big splurge on the Yamaha.  (it's earned a little pampering after all these years).  I found a see-thru filter at Volkswagen shop $2, a piece of 1/4 fuel line (not sure what size I needed) $3 and some BJ weld (they give you a black tube and a red tube to mix together) $4. .  Oh, and I picked up a multimeter with a clamp for a spark plug.  I'm storing the snowblower outside until I know it does not leak gas. I have started storing my plastic gas tanks outside too.  Just a little piece of mind.