Adjusting the Governor Speed

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Dudlydoodleright

New Member
#1
#1
This is a drawing of the governor mechanisum that the makers of the Doodle Bug motor (DB30) copied

Note that the spring that runs between the two linkages has 3 holes on the left shaft and two holes on the right that it can be put in thereby giving a total of 6 different settings that it has. Move the spring to a higher hole and the governor will set to a faster RPM-move it to a lower hole and it will set to a lower RPM. Because few of us have a tachometer that works with a magneto ignition- one way to check at what RPM your governor is set to is to first go to the engine modification threads and the first sticky is a link to a speed calculator. Use the calculator to see what would your bikes top speed be at 3600 RPM then run your bike to top speed and check your speed with a GPS- if the bike will go faster than the calculated speed then you may wish to stop speeding up and reset the governor so that it limits top speed to what the caculator indicates it would be at 3600 rpms.:deal:
You may find that a stock Doodle Bug will not go as fast as the governor would let it because it dosen't make an honest 2.8HP--or it may be because your eating too many doughnuts and and keep getting on your kids minibike:eek:hmy:
 
cudaman

cudaman

Member
#2
#2
Great informative post! Thanks.

To delay the gov at higher rpm, would you want to move the spring to the higher hole on the left or move it higher at each end?
 
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Dudlydoodleright

New Member
#3
#3
You can go one side or the other- don't do both in one try as you can speed things up too much-so do steps and test. The upper hole on the right makes the thottle move things a little more and the ones on the left don't but a Doodle Bugs throttle twists plenty-- so it's not an important difference.
 
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supernova

Banned
#4
#4
If you add a stiffer spring but make sure it's not tight at startup and idle you'll bypass the governor and get as much as it has to give. Too tight and it'll take off at startup, it needs to act exactly like the stock spring only stiffer.:thumbsup:
 
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