I'm Not Sure Why, But I Now Have a B-80

[BradKahler 196]

1 hour ago, Handy Don said:

Brad you are making great progress! 

To my eye, and agreeing with your assessment,  it looks more like the belt guard is mounted a bit higher than I'd expect which makes that gap to the guide bigger. Once you have the top tab where you want it and correctly spaced, then gently bending the bottom will get you home. 

And yes, in the interest of having the drive belt stop promptly when the clutch is fully disengaged, the close gaps are important. 

 

Thanks for the info.  Your comment about the belt guard position, reminded me about the mounting hole in the top bracket.  It has been enlarged and I'm not sure why.  I  think I'll take a closer look to see what's going on there.  I do know the bolt in the middle bottom line up without issue as did the two at the top rear.  Only the front hole had issues.  

 

Also, does the belt look a little loose?  The clutch is not pushed in so I would think the belt would be a bit tighter.  I'll remove the guard and take another picture.

 

Thanks.

[Handy Don 15,218]

On 12/15/2025 at 1:58 PM, BradKahler said:

Also, does the belt look a little loose?  The clutch is not pushed in so I would think the belt would be a bit tighter.  I'll remove the guard and take another picture.

I thought you got the picture with the clutch disengaged!  Definitely loose. The belt in the manual picture show the belt nicely snug. 

The trick is to have the clutch/idler arm still be tilted forward some when the clutch is fully engaged. If the arm is too vertical, then it cannot keep the belt taut. 

 

Some members have reported weakened or over-stretched clutch tensioner springs, so that’s something to keep in mind as well.

The larger hp WHs that I’ve seen use ⅝” drive belts and I’m sure you already know that belts wear on their sides and hence over time ride deeper in the pulleys, creating the erroneous impression the belt has “stretched."

Edited 1 hour ago by Handy Don

[BradKahler 196]

On 12/15/2025 at 5:33 PM, Handy Don said:

I thought you got the picture with the clutch disengaged!  Definitely loose. The belt in the manual picture show the belt nicely snug. 

The trick is to have the clutch/idler arm still be tilted forward some when the clutch is disengaged. If the arm is too vertical, then it cannot keep the belt taut. 

 

This is what mine looks like with the clutch pedal at rest (not pushed).  

 

 

On 12/15/2025 at 5:33 PM, Handy Don said:

Some members have reported weakened or over-stretched clutch tensioner springs, so that’s something to keep in mind as well.

The larger hp WHs that I’ve seen use ⅝” drive belts and I’m sure you already know that belts wear on their sides and hence over time ride deeper in the pulleys, creating the erroneous impression the belt has “stretched."

 

I'm almost certain the belt is worn.  I took it for a drive up and down my driveway this morning and it slips in 2nd and 3rd and maybe a little bit in 1st gear.  When in 2nd or 3rd, a slight incline will cause it to slip.  I ordered a Toro brand replacement belt last night and should have it before the end of the year.  I don't plan on adjusting the belt guard guides until the new belt is installed.  

 

[BradKahler 196]

Yesterday I finished up the electrical wiring and this morning I took it out for a test drive, mainly to circulate the diesel fuel that is currently in the gearbox.  Right now the diesel is being drained (drip drying!) and then I refill with diesel again and go for another drive.  The diesel is dirty but doesn't seem to have any debris of any kind mixed in it.  I'm  hoping one more run with diesel will be enough.

 

 

Getting the last bit of diesel out

 

 

 

While replacing all the wiring I went ahead and re-installed the old regulator along with a ground wire from the battery to one of the mounting screws.  The regulator does work.  The only odd thing I noted was as I brought the engine down to idle, the needle started bouncing back and forth rapidly.  I slowly brought the idle back up and I could got it to stop bouncing, however the idle speed was a little higher than I would like.  Is this a normal situation or does that mean only half of the regulator is working?

 

[pfrederi 19,278]

Idle speed for a Kohler single is 1250...

[Handy Don 15,218]

Progress!

37 minutes ago, BradKahler said:

This is what mine looks like with the clutch pedal at rest (not pushed).  

I see that the spring hasn’t got a lot of tension--the arm is tilted rearward pretty far. The pulley (on the other end) is likely nearly at the top of its arm’s swing. Plus belt slipping under load. I don’t see anything mechanically damaged. Correct new belt ought to solve all. 

 

32 minutes ago, BradKahler said:

The diesel is dirty

The mocha coloring is likely mostly from water/moisture. Not surprising. All but impossible to completely eliminate without opening the transaxle. Once filled with the appropriate gear oil, trace residual amounts in the transaxle are inconsequential. Please be environmentally conscious when disposing the drained diesel. 

 

35 minutes ago, BradKahler said:

needle started bouncing back and forth rapidly

Hooray that you won’t need a new VR.

When the stator’s output voltage at low RPM (going into the VR) is close to the same as the battery’s already stored voltage, the VR can “flutter” back and forth between trying and not trying to continue sending charging current to the battery. Normal. 

 

As @pfrederi noted, the recommended idle speed (check the manual for your engine) is often higher than many folks realize. I set my K181 to 1100 RPM using a free optical tachometer app on my phone (it’ll idle as low as 500 RPM, and sound cool doing it, but NOT recommended). 

[sqrlgtr 1,345]

1 hour ago, Handy Don said:

As @pfrederi noted, the recommended idle speed (check the manual for your engine) is often higher than many folks realize. I set my K181 to 1100 RPM using a free optical tachometer app on my phone (it’ll idle as low as 500 RPM, and sound cool doing it, but NOT recommended). 

 

Very good advice here, remember thes are aircooled and need the rpms at idle to stay cool .