Jdub goes there 1981 650e rebuild

[jdub6092]

After seeing my same model restored by kiwi canuck, I decided to do a full restoration on my 1981 gs650e.
I have been doing little bits here and there. Cleaning, sanding, polishing, a little bit of painting, replacing the rear tire and bit by bit, tearing down the frame.
I eventually had to face the most intimidating task for me - removing and tearing down the engine.
Other than 4 broken valve cover bolts, it hasn't been too bad. I've watched many hours of youtube, and looked at this forum enough to build my confidence that I can indeed do this.

Pictures coming.

[jdub6092]

Dirty engine3.jpg
Looks pretty filthy, but I actually only spent about 20 minutes on #4 piston using carb cleaner and a nylon then wire brush.
Could probably save time pulling the cylinder head and soaking the pistons in chem-dip or dropping them in the ultrasonic cleaner.

[Nessism]

You should remove the cylinder barrel. The base gasket needs replacing, OEM gaskets ONLY. And you may want to replace the rings too. Yes, more money, but it's worth the expense in the long run.

[jdub6092]

Frame2.jpg
Frame degreased and washed. Have not decided on whether to send out for sandblasting and powder coat or sand it down partially and repaint myself.
I have some aircraft stripper standing by as well.
Any suggestions? Best bang for buck?

[jdub6092]

You should remove the cylinder barrel. The base gasket needs replacing, OEM gaskets ONLY. And you may want to replace the rings too. Yes, more money, but it's worth the expense in the long run.

I will eventually replace the base gasket for sure. Will I need a special tool for removing the pistons from the rods? Or is there a homebrew method.

I see you are from Torrance. I lived off of Crenshaw just up the hill in PV Peninsula. I bought the bike at Laguna Hills Suzuki. Don't think they are still in business.

[Nessism]

I will eventually replace the base gasket for sure. Will I need a special tool for removing the pistons from the rods? Or is there a homebrew method.

I see you are from Torrance. I lived off of Crenshaw just up the hill in PV Peninsula. I bought the bike at Laguna Hills Suzuki. Don't think they are still in business.

You don't need to remove the pistons. But if you do, the only tools needed are a pair of needle nose pliers for the C clip. Once you touch the clips, they must be replaced also.

Too bad you aren't in this area anymore, I'd help you. Or, at least, offer tool support. Salty_Monk (Dan) is in Redondo Beach. The GSR is a great community!

Regarding, painting yourself or powdercoat, I vote the later, as long as you can find a reasonable price. Rattle can paint sucks. You need to move up to two part catalized epoxy primer and then top coat, to match the durability. Plus, painting yourself, is a crazy amount of work, if you do it RIGHT. Please check my KZ750 rebuild thread, if you have time. It may offer you some suggestions on the restoration process of your bike...

[jdub6092]

You don't need to remove the pistons. But if you do, the only tools needed are a pair of needle nose pliers for the C clip. Once you touch the clips, they must be replaced also.

Too bad you aren't in this area anymore, I'd help you. Or, at least, offer tool support. Salty_Monk (Dan) is in Redondo Beach. The GSR is a great community!

Regarding, painting yourself or powdercoat, I vote the later, as long as you can find a reasonable price. Rattle can paint sucks. You need to move up to two part catalized epoxy primer and then top coat, to match the durability. Plus, painting yourself, is a crazy amount of work, if you do it RIGHT. Please check my KZ750 rebuild thread, if you have time. It may offer you some suggestions on the restoration process of your bike...

I certainly will check out your rebuild.
Good to know that I can use needle nose. The Service Manual was calling for a special tool to disconnect the pistons. I'll check the rings as well, and then will need to find a ring compressor if I need to replace them.

I'm not too concerned with the cost at this point, now that I've committed to this project. However, my wife keeps showing me the CC statements and asking how much more I will spend. Probably a bit north of 2K already.

[jdub6092]

Pistons removed and cleaned up.
Looks like the rings are out of spec according to the service manual.
Could I get some recommendations for rings ? Are the Cruzinimage rings satisfactory. The cost for four sets is about the same as one NOS set.
Also, I will need to hone the cylinders. Recommendations for a honing tool, size and grit?

[Nessism]

https://www.amazon.com/Brush-Research-Standard-Cylinders-Hydraulics/dp/B007INT3VO

320 grit would be okay also.

[Rich82GS750TZ]

I am not an engine builder, but twice I've used the dingleberry hone that Ed linked above. I think I did OK. Don't remember which grit. I could look when I get home and see if I still have the package it came in. You can find numerous videos on youtube on the proper technique, and decide which, if any, you want to follow. I used Marvel Mystery Oil as Lube. Not specifically recommending that, either. Watch some videos and decide for yourself.
This my my result:

[jdub6092]

Done. Thanks for the recommendation. Noticed the tool diameter (2.5") is just slightly larger than the cylinder (62mm/2.44"). I assume this will put enough pressure on the walls to deglaze and create the cross hatch pattern?

Any recommendations for piston rings?

Just removed all of the valves and got started on cleaning and polishing. Ordered lapping tool and compound. Combustion chambers were heavily encrusted and are gonna take some time.

[jdub6092]

Please check my KZ750 rebuild thread, if you have time. It may offer you some suggestions on the restoration process of your bike...

Just got finished binge reading your rebuild. Fantastic job Ed. Holy crap. I've been polishing hardware as I go along, but zincing every piece was a pipe dream at best.
Your instrument cluster looked brand new. Mine doesn't even have all the lettering. Crazy attention to detail.
Has anyone here taken their rebuilds to the Las Vegas AIMS Expo?

[jdub6092]

I am not an engine builder, but twice I've used the dingleberry hone that Ed linked above. I think I did OK. Don't remember which grit. I could look when I get home and see if I still have the package it came in. You can find numerous videos on youtube on the proper technique, and decide which, if any, you want to follow. I used Marvel Mystery Oil as Lube. Not specifically recommending that, either. Watch some videos and decide for yourself.
This my my result:

Looks great Rich. I'll use that close-up as a guide for obtaining the 45 degree cross hatch pattern that is required.

[jdub6092]

20240204_055500.jpg Don't think there is a standard tool for removing this race as it flares out and cant be reached from the top with a drift or screw driver. Looks like I'll need to cut it out like on Ed's KZ750 rebuild.

It's also not flush with the bottom, nor does it butt up to the retaining lip above and is skewed. Didn't have a problem with steering though. The bearing was tinted orange from the rust and a bit on the tight side.

A little confused as to how far in to install the new race as most I've seen are inserted flush with the bottom of the neck. Thinking that it is inserted flush and cranking down the tree will determine the final position. Have a couple of weeks to figure it out as it's time to prep and paint the frame.

[Grimly]

Run a bead of weld along the inside of the bearing cup, it will drop out when it cools and shrinks.
When fitting the new one, I just knock them down until they seat. The frame makers leave a ledge for that purpose.