I put new bearings and seals in the frankenstein motor that I'm putting together (GT125 guts in VNB cases). It turns over and everything moves, but it seems a bit "stiff." I don't have it in a stand, I'm just have the kickstart on and pushing on it by hand with the motor sitting on the bench. I don't hear anything rubbing and all the parts seem to work (shift, clutch, piston goes up and down).
Is it normal for an engine to be a little stiff when it is first put together, or should I be worried?
Joined: 03 May 2005
Location: Minneapolis, Camden
Isn't anyone going to say it?
*more happy crickets chirping away*
Oh, alright then...
Brad! This is a "family" scooter forum, dude.
Should've resisted. Couldn't. Did it anyway.
("...but I do have my little card explaining that I have been waiting at this darn light way too long, officer, and am within my rights under Minnesota state law to go through. I know it's here in my wallet, um, somewhere...")
Okay, then, bad joke done and over with. Nothing more to see here. Move along. Move along. Y'all can go back to talking 'bout how (cue up Dr. Evil voice) "stiff" your "engine" should be or whatnot.
How about "tight?" No, that doesn't work either...
Continuing on the sexual theme, are the nuts on the cylinder studs 7mm, 1.0 thread pitch? I have one nut that stuck on the top of the stud thread, then drove the stud into the block until the head was tight.
It probably doesn't make any difference, everything is tight. But it irritates me enough that I might pull it off, reset the studs and tighten the head down again.
If I ever get this bike together, it will be a complete bodge job, hopefully one that runs.
Last edited by Brad on Tue Jan 17, 2006 8:40 am; edited 1 time in total _________________ Brad
Joined: 18 Jun 2005
Location: Longfellow, Minneapolis
If I ever get this bike together, it will be a complete bodge job.
Ever thought of moving to Vietnam? You could run a business putting scooters together...
Seriously Brad, it sounds like you're doing great! It seems to me that it should be pretty damn tight if it's essentially a virgin motor. There we go again...
But if the nut is really stuck at the very end of the stud, I'd probably take it and the stud out, get that nut off there and figure out why. I don't really know what I'm doing, but it seems to me you want to make sure the head is on there good...
"The most enviable grease nipple range in the world."
Now I'm going to be giggling all day long with that bouncing around in my head and people are going to be wondering about me. Well, they wonder about me already. They'll probably just slowly move away from me now.
Brad keep in mind you are looseing a lot of leverage when the engine is not mounted in the frame or stand. Have you added oil back into it yet? that will help with all the friction, if the cylinder is clean and dry your rings will be adding quite a bit of drag too.
it's gonna be tight as a bastard till ya run it. if ya didn't use a little oil on the cylinder and piston it was probably tough to put it together. remember if you have a top end on there that is new or has been rebored make sure you use exta oil when premixing.
I'm reusing the top end, but the motor has all new bearings and seals. Plus it is 32 degrees in the garage, so I think that it's going to be a little stiff. I'm going to assume its fine. I'm going to have to figure out a stand to see if it runs.
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