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I may be the last person in the world to know this, but in case anyone else does not, I have decoded the head numbers for SOHC 750s. K - cannot find any number on the head, although the head was modified by RC eng. F1 - 300_X - on the rear/upper/center fin F2 - 410_X - on the rear/upper/center...

Very nice!!! Just in time for the season! Nice insert paint.

DD - I cannot get the pictures to upload... I'll send them to you via e-mail. The upper rollers on all I have are somewhat harder than the lowers. The pics show the lowers I have are all in great shape, except the one out of the K2. Cyclebuster - The sound is perfect for me, but my son...

Hi DD, The chain was in the inventory, so I have no history on the miles... I also found another outer link that had failed in the chain, so I need to find 3 pieces of outer links. The cam bearings showed no signs of bad behavior. no evidence of any valves hitting the pistons, which I find...

The chain was heavier than others I have on hand. There are teeth marks on some of the rollers, so I think the chain went slack, bound up and broke. I will look at the cam bearings for any sign of bad news. I have looked over the chain slider and tensioner wheels - nothing bad in either. I...

The Bike is scary fast!!! Pretty close to a stock Z1, as I recall. Dirtdigger told me to put in a new heavy duty cam chain, but I didn't. It broke after about 50 miles of hard flogging. No damage to valves or pistons, strangely enough. The bad part is that I now need to break the cases to...

Free stuff??? What a bonus!

Thanks Dirtdigger, My curiosity got the better of me as to which might be better or one to stay away from. One of the 410 heads is in pristine condidtion and has not been fly cut as in the one photo I posted. I think I will use it as my first trial. I have found other pistons that are very...

I am building a mongrel, by any standard. I have heads that are numbered 410 and 300, both appear to be F heads. Does anyone know what these numbers mean? Thanks, Jeff

Thanks again, Dirtdigger! Yeah, I learned about fatigue limits in college. Aluminum does not have one, the strength goes to zero. The lesson was learned by the Electra jet, at the loss of too many souls. I intend this build to verify the general characteristics of the motor, not running at...

I have wieghed the used piston and it is 29 grams heavier (roughly 18% over stock weight). It has some carbon on the dome, so it must have worked in the TQ for some time, however the underside of the crown is only a light gold to aluminum color. I do not know what rods were used with them, so...

Hi Dirtdigger, The weight of 65mm piston is 45.4 grams heavier than the stock one with pins, rings and keepers. I found a source that cited a bare stock piston at 159 grams. I have a well used set that have holes in the skirt, so I will put one of them on the balance to see what they weigh as...

Thank. I was hoping they were OK. I think the cam is designed for mid range torque, although they seem a bit lumpy as compared to some of the other cams. This stuff is all from TQ Midget inventory. I believe the goal for them is to get the middle RPM to push hard. I have 8 cams and one...

Photos are attached. I have rechecked the heavy studs I have. I only have the 12 longer studs. The 4 shorter are stock. I noticed that is the way some kits are sold.

Thanks Cyclebuster & Dirtdigger, I'll post some pictures late tomorrow of the cam, pistons and head. Have a great night! Jeff

The duration was measured by using a dial indicator zeroed on the round. I then rotated the cam until I got 0.002" movement in each direction. I read the degrees in between, did the math. In my looking for anything on these cams I found a site for CB750 cams that has cams that go to 268 at...

Thanks again, Dirtdigger! I am sorry to be such a pain. I have all of these parts without any documentation of configurations used to build the motors. Ask me about old Triumphs, I can answer, but this is all new to me even though it is very old. I will replace the studs with the full...

Thanks, Dirtdigger. The pistons I am using are domed in their original form. They have been machined to create valve relief and coned to create a specific compression ratio (CR) for alcohol, much higher than gas burners. The F heads have been "fly cut" to increase the chamber size to avoid...

I am new to the world of SOHC 750, so please hold off on the laughter. I have inherited a bunch of SOHC stuff that was originally modified to 65mm bore and used on 3/4 Midget cars. I have also picked up a couple K model bikes. The first is a K2 that I have pulled the motor and removed the top...