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Author Topic: GS-550L to GS-674 Frankenbike project  (Read 4149 times)

Offline sxecafe

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Re: GS-550L to GS-674 Frankenbike project
« Reply #120 on: Apr 05, 2013, 14:24:07 »
Looks great! How you liking the fuse box?

Offline Toast

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Re: GS-550L to GS-674 Frankenbike project
« Reply #121 on: Apr 07, 2013, 02:31:16 »
It's good, I like it. As far as fuse boxes go it's the best bang for your buck.



This weekend I want to get the motor buttoned up, so today I tackled getting the pistons ready and installed. I was worried about getting the circlips in because when I took them out, they sprung out all over the garage.

I ended up buying a few extra just in case but I ended up not needing them (thankfully).


Getting started


Almost there


Seated


I rotated the clips so that the open ends were either straight up or down. Supposedly it's bad to do it any other way, I dunno how that would make a difference but I didn't want to have a piston come flying off.

Offline Toast

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Re: GS-550L to GS-674 Frankenbike project
« Reply #122 on: Apr 07, 2013, 02:31:48 »
New rings


Checking ring gap








There was no minimum spec in the manual but they were well below .7mm. They all came in at around .2mm which is the same as the old rings I pulled off the pistons.

One on



Btw, getting the pistons into the jugs was such a huge PITA. I was trying to raise the pistons into the sleeves but it was just not working. Anyway, here it is complete.



Tomorrow I want to lap the valves and install the new seals, and hopefully get the engine all together and torqued. Maybe even time it if I don't run out of daylight.

Offline jwegman

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Re: GS-550L to GS-674 Frankenbike project
« Reply #123 on: Apr 08, 2013, 23:09:36 »
Looks great. I ended up putting the pistons in mine this weekend also.  I like your strategic placement of rags to catch stray clips from going into the case.  I dropped one and had a heart attack for a few minutes but luckily found it with a magnet.  Looking forward to seeing your post on the valves and heads since I'll be tackling that after I get my head back from blasting.

Offline Big Rich

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Re: GS-550L to GS-674 Frankenbike project
« Reply #124 on: Apr 08, 2013, 23:38:12 »
Yes sir, looking good Toast.
I'm on hiatus - pm's are linked to email. So message me if you need something.

GS450: http://www.dotheton.com/forum/index.php?topic=40176.0

GR650: http://www.dotheton.com/forum/index.php?topic=18045.0

Offline Toast

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Re: GS-550L to GS-674 Frankenbike project
« Reply #125 on: Apr 09, 2013, 19:47:36 »
Yes sir, looking good Toast.

Thank you kind sir.


Looks great. I ended up putting the pistons in mine this weekend also.  I like your strategic placement of rags to catch stray clips from going into the case.  I dropped one and had a heart attack for a few minutes but luckily found it with a magnet.  Looking forward to seeing your post on the valves and heads since I'll be tackling that after I get my head back from blasting.

Haha yea I tried to close up any openings, trying to fish out a circlip from the engine would have suckedd.




Here are the pics from the last half of the valve job.

This exhaust valve was the worst, the rest were pretty clean with just some normal carbon.





A quick touchup with the wire wheel fixed them up. Even though these are hardened steel I wouldn't use a really coarse wire wheel on them, the bench grinder I have has a pretty soft wire on it.





The nasty looking valve seats



Add lapping compound to the valve seating area and the seats on the heads, apply some pressure and twirl like you're starting a fire. Lift and rotate the valve every 4-5 spins (?) to make sure the compound is evenly distributed.


Lapped valve (I did this one again later) and valve seat





I cleaned out the exhaust port some while I was at it




There is a really sharp and rough casting mark that could be smoothed out, I'm not sure if I should though. I've been reading a bunch of porting threads and the general consensus is to just leave the ports alone unless you know what you're doing.