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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.
with 2-1 and fuel injection, I am curious what cam will sound like. Carbed bike with a cam warming up like it is going to stall, is closest I'll probably ever get to a shovel.
Doing last build, I had engine out so decided to engine mount. I could not get clearances to get top end back together in frame. Even though I pulled it out, and did once before too. Ended up having to loosen engine mount. Just thought I would bring that up. Guessing it will compress with use, either that different model is hair taller.
It was hyper something, I can't remember. The reading said they were not supposed to expand and they claimed better. Not sure I would have to took the chance. I was introduced to the shop doing the boring by someone who had been doing years of work with. It was during covid, took longer than expected. I alwasy wondered if that is what he liked or supply chain. I only got 2k miles on build, been more my solo bar hopper
Hyper pistons expand less than older cast pistons. STD HD cast pistons are Hyper but not as much as KB. Hyper pistons have silicon supersaturated to the point where is can precipitate out.. (IIRC) Honda switched to Hyper cast pistons in about 1979.
I am curious if I will notice the balancing of the crank. In theory harley knew the weight of the pistons they were using when they built the crank.
Also wondering if this will cool down the bike, which I think is EPA restrictions. Though adding bigger engine will add heat probably. My 88 and then 98 didn't seem so hot. Not apples for apples, but just what I notice. Wish I would have heat gunned it
Last edited by Rounders; Jan 18, 2024 at 09:05 PM.
The EZ start issue I heard of was if you put them in bike with ACR's,-- too low compression to start, just had to deactivate them in the tune.
Some make noise at idle or you hear them clank on shutdown.
Something else is pushrod adjustment is a little different on EZ starts, is it possible to do compression test?, run it on one cylinder?
Another option is to get later 103 heads with ACR's and install HD's SE ACR harness, that's what I did with my '09, well worth it for me, those manual CR's soon become a pain.
Not doing S&S EX start. Doing .040 head gasket which will lower it a little. Doing S&S MR103 cams, but not the easy start. I agree manual releases would be a pain. Though now would be the time to install, but hoping I won't need to .
One one hand I think those ez starts are ingenious. On the other hand its a moving part in the engine that the old lady in me worries could come loose or clog up. i am sure it is unfounded. One builder liked them, the other didn't. Which is often case. Notice how many knowledgeable people are left here? They get in arguments over this kind of stuff and get banned. I don't have the history here, but have seen it else where.
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