honda hrb 535 over revving

[miker]

mower was working fine, went for a cup of tea,started mower back up and it raced its nuts off??, nothing stuck anywhere, govenor spring looked fine, any ideas , cheers

[log supplier]

could be a bit of dirt or rust in the bottom of the carb bowl causing a weak mixture? or the cooling fins have drawn abit of rubbish in and jammed the throttle control spring open?

[Simon R]

Check to see if the governor arm is stuck?.....can u move it back and forth with your finger?........is the bolt that holds it on loose and the linkage slipped on the shaft????

With the engine running can u move the governor with your finger and slow the engine down??

had a few of these honda engines with sticking governors..stripped engine,found no definitive fault with governor cleaned and re-built,fresh oil and hey presto no more racing away.

[miker]

yes can slow the engine back to tick over by a light touch so its not stuck, will check the bolt to see if it is loose, gonna put new spring on as well

[Simon R]

Think there is either 2 or 3 holes that the front of the spring can fit in to change the tension? try putting it in a different one to give a little more tension.....if not you can just very slightly bend the the little tang where the rear of the spring fits in the governor arm to increase tension to try and lower the speed.

(it is quite possible that you have maybe caught something in the spring area when cutting....ie:pushing mower under a bush...)

[miker]

really strange tho, was running fine,went to start back up after my pg tips and started racing, there is only one hole for gov spring

[spudulike]

My brother had a similar thing with his Viking, first time it was a loose arb manifold, second time a mounting bracket had fractured - probably due to him walloping the cutter and bending the mounting shaft:blushing:

 

Got both problems sorted though:thumbup:

[Simon R]

Try re-setting the governor coz it sound like it may have slipped on the shaft.

 

loosen nut on shaft,turn shaft counter clockwise with a pair of pliers,push linkage forward with finger to its stop, then re-tighten nut,start machine and try.

 

If that dont work try turning clockwise.

[miker]

thanks simon, will have a look

[miker]

ok tried that, still the same, its flat out all the time?????????????