Question for those using Adjustable Pushrods
Road Warrior
Joined: Jun 2007
Posts: 1,788
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From: Here
I checked mine after the first 100 miles and they were still tight. Might be checking them at each oil change after reading that post about the rod shooting through the tube though... Sure couldn't hurt to make sure they are ok.
Road Warrior
Joined: Jan 2007
Posts: 1,779
Likes: 223
From: Northern California
Can anyone tell me where I can find a good step by step explanation on how to properly adjust adjustable pushrods on the net? Preferably with illustrations.......Thx, Rich
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Road Warrior
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Cruiser
Joined: Dec 2006
Posts: 178
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From: Central Valley CA
To adjust pushrods that you may no longer have the instruction sheets for or may have come in a bike when purchased, you can figure out the adjustments as follows.
The number of flats to turn the nut for proper pushrod adjustment can be calculated easily. First you have to find the number of threads per inch (tpi) on the adjusters. To do this simply measure 1 inch of threads and count them.
The tappet plunger moves aproximately .190" and the adjustment is in the middle or at about .100". To figure the number of flats for a .100" adjustment, use the following formula... number of flats=.100"/[1"/(tpi*6)]
For example, an adjuster turned 3 turns (18 flats) @ 30 tpi will make the pushrod .100" longer.
30tpi*6=180 (Threads per inch TIMES 6 = 180)
1"/180=.0055555 (1 inch DIVIDED BY the answer from above, in this case 180)
.100"/.0055555=18 flats (.100" is the amount of desired pushrod movement DIVIDED BY the answer from above .0055555 and EQUALS the number of wrench flats to obtain the desired adjustment.)
To further explain this....
tpi TIMES 6 gives the total number of wrench flats in 1" of the adjuster. 30tpi TIMES 6 wrench flats per thread EQUALS 180 wrench flats per inch.
1 inch DIVIDED BY the total number of flats (180) EQUALS the amount of travel for 1 wrench flat (.0055555")
Total travel desired (.100") DIVIDED BY the amount of travel per wrench flat (.0055555") EQUALS the number of wrench flats to achieve the desired travel (18 flats).
The number of flats to turn the nut for proper pushrod adjustment can be calculated easily. First you have to find the number of threads per inch (tpi) on the adjusters. To do this simply measure 1 inch of threads and count them.
The tappet plunger moves aproximately .190" and the adjustment is in the middle or at about .100". To figure the number of flats for a .100" adjustment, use the following formula... number of flats=.100"/[1"/(tpi*6)]
For example, an adjuster turned 3 turns (18 flats) @ 30 tpi will make the pushrod .100" longer.
30tpi*6=180 (Threads per inch TIMES 6 = 180)
1"/180=.0055555 (1 inch DIVIDED BY the answer from above, in this case 180)
.100"/.0055555=18 flats (.100" is the amount of desired pushrod movement DIVIDED BY the answer from above .0055555 and EQUALS the number of wrench flats to obtain the desired adjustment.)
To further explain this....
tpi TIMES 6 gives the total number of wrench flats in 1" of the adjuster. 30tpi TIMES 6 wrench flats per thread EQUALS 180 wrench flats per inch.
1 inch DIVIDED BY the total number of flats (180) EQUALS the amount of travel for 1 wrench flat (.0055555")
Total travel desired (.100") DIVIDED BY the amount of travel per wrench flat (.0055555") EQUALS the number of wrench flats to achieve the desired travel (18 flats).