Re-baking my ST1300 (Almost-full-redoing)

Today the lady passed the inspection without issues. I achieved to fix the SMC changing the circlip and worked great. I'm changing it completely when the parts arrive.

Also I found out that the odometer surpassed the 199.999 kms and got back to zero 10 years ago, so the motorcycle has 293.000 kms. Surprised me that is working great in spite of that much of a use. I'm thinking about getting a used engine with less kms and save this one for parts if someday I need those. All the bike is great, changing the engine after all the work could be like just changing a diaper to the bike at this point.

I expected it to be a bit stronger, also I noticed that reaching 160 kms/h without noticing almost any vibration, doubt, anything, could be NOT a signal of being not strong enough, but of excellence of technical output. For real I don't notice the speed or the push of the bike, but I'm full aware that I'm changing to the 2 and 3 gears in just a coulpe seconds after a twist of the wrist, and at 140 kms/h. This bike just it's dead bored at 120 kms/h.

Sometimes I think I'm noticing a bit of power losing, but the day was really windy, could be front wind, it's the same sensation but sustained in time (brakes creating issues maybe??) I also noticed that the spring of the front brake master cylinder is weak and it's not pushing out properly the piston, to the point that the brake light stays ON sometimes. All is OK but I see that, the piston is not coming out with enough strenght, also I notice when braking that it's not pushing too hard at all.

Damn thing brakes like hell anyways. I'm really happy with the results, and the pressure of the front brake is never reaching more than 50 bar when braking, 100 when forcing it a lot. A common braking I think it should be around 20, 30 bar at most. Emergency braking around 60, not more than 70 bar.
 
Today the lady passed the inspection without issues. I achieved to fix the SMC changing the circlip and worked great. I'm changing it completely when the parts arrive.

Also I found out that the odometer surpassed the 199.999 kms and got back to zero 10 years ago, so the motorcycle has 293.000 kms. Surprised me that is working great in spite of that much of a use. I'm thinking about getting a used engine with less kms and save this one for parts if someday I need those. All the bike is great, changing the engine after all the work could be like just changing a diaper to the bike at this point.

I expected it to be a bit stronger, also I noticed that reaching 160 kms/h without noticing almost any vibration, doubt, anything, could be NOT a signal of being not strong enough, but of excellence of technical output. For real I don't notice the speed or the push of the bike, but I'm full aware that I'm changing to the 2 and 3 gears in just a coulpe seconds after a twist of the wrist, and at 140 kms/h. This bike just it's dead bored at 120 kms/h.

Sometimes I think I'm noticing a bit of power losing, but the day was really windy, could be front wind, it's the same sensation but sustained in time (brakes creating issues maybe??) I also noticed that the spring of the front brake master cylinder is weak and it's not pushing out properly the piston, to the point that the brake light stays ON sometimes. All is OK but I see that, the piston is not coming out with enough strenght, also I notice when braking that it's not pushing too hard at all.

Damn thing brakes like hell anyways. I'm really happy with the results, and the pressure of the front brake is never reaching more than 50 bar when braking, 100 when forcing it a lot. A common braking I think it should be around 20, 30 bar at most. Emergency braking around 60, not more than 70 bar.
I always found the ST1300 does not FEEL fast. I believe that is because of it's linear power band, there is no top end rush. Just keep an eye on the speedometer, it is faster than it feels!
 
Um, yeah, changing the engine...

I did one of those (and I still haven't finished it, due to life!) It wasn't fun.

I had an old cop bike with a good engine and a good bike with a bad engine (the guy I got it from ran it out of oil.) So I decided I would swap the engine out of the ex cop bike and put it in the other bike. A second reason was I wasn't too sure about this cop bike, too many cut wires and bad/wrong bolts on it.

It took a bit of work, I used my tractor to lift the ex cop frame off the good engine.

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And after loosening the bad engine from the other frame, I took off the heads, turned the block 90 degrees and slid the engine out of the frame.

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Then when I was ready, I again used the tractor to put the good frame over the engine.

20250430_2tractorLowerFrame.jpg

I actually got it going!

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I still need to rebuild the forks, flush out the brakes and a few other things to get it road worthy.

Unless you really think you need another engine.... maybe, just replace the seals in the old one?
 
...... so the motorcycle has 293.000 kms. Surprised me that is working great in spite of that much of a use. I'm thinking about getting a used engine with less kms and save this one for parts if someday I need those.
My first instinct would be to tell you to not waste your time or money. There are a lot of ST1300's that have a lot more mileage on them than that and are still running just fine. If your engine ever blows up there are always cheap used engines available. Forget about it and put your money towards enjoying riding the one that you have.
 
Guessing; Dirt in the circlip groove? (Clean groove). Damaged outer retaining edge of circlip groove? (Replace SMC housing). Fatigued clip with not enough tension to stay in groove? (Replace circlip). Wrong circlip installed? (Ensure circlip used is PN# 46182-500-013).
Regarding piston C-clip failure, I thought of something Larry @Igofar shared about the circles have different edges on different side. Here's an AI explanation attached:
IMG_8901.PNG
 
Um, yeah, changing the engine...

I did one of those (and I still haven't finished it, due to life!) It wasn't fun.

<snip>

It's always cool to see someone getting that deep into these bikes. It helps me realize just how much I didn't put on mine and what a big job it is to work on an intact ST13. lol...
 
I always found the ST1300 does not FEEL fast. I believe that is because of it's linear power band, there is no top end rush. Just keep an eye on the speedometer, it is faster than it feels!
This is my exact same experience. Even grabbing a handful of throttle in 1st and 2nd doesn't give me a visceral sensation of acceleration. Well a small exception is a slight twist of the wrist at very slow speeds. A G2 Throttle Tamer took care of that for me.
 
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