Can you reverse the head?

[oldguy387]

I have a Raw Motor. 80cc. I have this motor mounted on a mountain bike frame. Now, looking at the engine from the drive sprocket side (left leg side) the motor fits with very little room under the top tube with a stubby spark plug installed. The spark plug is mounted on the right side or carburetor side of the head. To get more clearence, can you take off the head and reverse it so the spark plug is on the down tube (front of the bike) side?

 

[Dave C]

Yep, just torque it back down to whatever is advised. If there's no torque spec mine says 12 1/2 foot pounds. Use some kind of a crossing pattern and take it up to spec gradualy and evenly.

 

[srdavo]

Yep, just torque it back down to whatever is advised. If there's no torque spec mine says 12 1/2 foot pounds. Use somekind of a crossing pattern and take it up to spec gradualy and evenly.

is that foot/pounds or inch/pounds??

 

[Stan4d]

http://www.motoredbikes.com/showthread.php?t=25805

I have also seen a pic of someone reversing the whole jug so that the exhaust port is at the rear.

Should be inch pounds......you will need a quater inch drive torque wrench to get the most accurate torque.

 

[Dave C]

Nope, head studs 12 1/2 foot/pounds. I use a 3/8ths beam type. I have a 1/2" torque wrench, one of the click type but I don't use it for that low of a range.

 

[Stan4d]

Nope, head studs 12 1/2 foot/pounds. I use a 3/8ths beam type. I have a 1/2" torque wrench, one of the click type but I don't use it for that low of a range.

I was grossly mistaken, For some reason I have inch pounds stuck in my head.......glad I was not working on my bike today.

From a sponsors instruction guide:

Tighten all fasteners after each five hours of operation. Most important to check Cylinder head bolts : Tighten in a X pattern to 8 to 9 ft/lb. for 48cc 55cc; 12 ft/lb for 70cc 80cc engines using a torque wrench. A two piece cylinder and head design engine requires head bolts be kept tight. Important: Check head bolts before each and every long ride, vibration can cause them to loosen and blow a head gasket. Caution: Do not over torque or head bolts may break off. ( Twisted or broken head bolts due to over tightening is not covered by warranty. )

 

[Stan4d]

I found my confusion....I had recently read a post that converted to inch pounds:

On these cast aluminum engines 6mm studs torque to 50-60 inch pounds and 8mm studs to 150-200 inch pounds using a torque wrench. NOTE...INCH POUNDS