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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
Thanks a lot djl. Then I will use 0.007" per CC. And I will remeasure the CC:s. Just not sure now if I measured before or after the milling, three years ago. But from the figures at hand, it seems like 0.02" or 0.03" milling will do the thing
Last edited by OakMountainRider; Jan 22, 2026 at 02:09 PM.
The mistake some make with the 57 cams is not providing enough compression. IIRC, the 57 like about 10.2 static. Which in a 98" configuration would need a dome piston in lieu of flat top.
Mine was at 9.8 so perhaps that's why it felt off but the woods was fine and I would happily run it again at 9.8 static, well in a Dyna or softail anyway.
Still very interested to see how the OP goes with his, I don't know anyone else with a 57 in a 4" stroke engine at any comp.
Mine was at 9.8 so perhaps that's why it felt off but the woods was fine and I would happily run it again at 9.8 static, well in a Dyna or softail anyway.
Still very interested to see how the OP goes with his, I don't know anyone else with a 57 in a 4" stroke engine at any comp.
Did you ever measure the cold crank compression after installing the 57? To be honest, I was pretty happy with the 26. Just thought the 57 would be even better, especially over 3.000 rpm. Also thought the 57 would be easier on the crankshaft, as I worried the 26 made too high pressure on it. (My runout is fine though.) I have had the 57 cam on the shelf for two years, and I thought I would give it a try. Here in Sweden it is winter now. Around 1:st of April the bike is out and then we will see.
Last edited by OakMountainRider; Jan 23, 2026 at 01:46 AM.
Did you ever measure the cold crank compression after installing the 57? To be honest, I was pretty happy with the 26. Just thought the 57 would be even better, especially over 3.000 rpm. Also thought the 57 would be easier on the crankshaft, as I worried the 26 made too high pressure on it. (My runout is fine though.) I have had the 57 cam on the shelf for two years, and I thought I would give it a try. Here in Sweden it is winter now. Around 1:st of April the bike is out and then we will see.
I can't remember what it was now, it was a few years ago, I hope it all works out for you, the 57 is a good versatile cam, I'm not against it, I've put it in 103's in normal configuration and with plus and minus 4 degrees via an Andrews drive sprocket, only because it's what was available to the blokes who owned the different bikes at the time without spending much more dollars than they already had, all were happy with the performance gains, most of them at stock compression as well.
It ran strong in my bike, it just didn't feel happy to me, I can't really say it was this or that, maybe it was just me, dunno.
I need help from you guys. I am doing the clay test and have installed the adjustable pushrods on the rear. Now I want to turn the wheel so I get TDCC on the front. But there is too much resistance. I can get the rear wheel round. Heard a sound from the springs. Dont dare to pull the rear wheel hard. Pics below:
Last edited by OakMountainRider; Feb 4, 2026 at 02:55 PM.
You really need solid lifters to do the valve to piston clearance check.. Did you wait for the lifters to bleed down (you should be able to spin the pushrods by hand which will prove that the lifters had bleed down before going on to the rear..) before you spun the motor over??
Not only that, this is a bolt in cam why are you so concerned about valve to piston????
Last edited by 98hotrodfatboy; Feb 4, 2026 at 03:10 PM.
You really need solid lifters to do the valve to piston clearance check.. Did you wait for the lifters to bleed down (you should be able to spin the pushrods by hand which will prove that the lifters had bleed down before going on to the rear..) before you spun the motor over??
Hello, they are solid and dont bleed down, or? Anyway now I got it round to TDCC on the front. Thanks for helping me.
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