750 TSCC Rebuild or Replace?

[Big T]

TL/DR??

See post #21

[GSXR7ED]

I see I researched the earlier year 750...1976-78...thinking it was a "78 model. My apologies.

It's still an 8V engine...16V first came out in 1982 if history serves me right.

Ed

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[Rob S.]

This is going to be intersting...an 8V/750E engine (1976-78) into a 1982 16V/750T.

I'm sorry, I can't condone this.

You broke my heart, (Fredo), when you decided against an 1100 16 valve. But then I thought you were going with a 16 valve 750.

I wish you luck, I'm sure you'll do very well, especially since your interests don't conflict with my interests.

(And yes, the nurse was just here with my 'medicine.' )

[Rich82GS750TZ]

You guys are all confused. I just left Norm’s with a 1980 16V 750E engine. The only real difference I see is in the head design. It is a 16v. Promise.

sorry Rob. No 1100 this time.

thank you Norm

[rphillips]

Hey Rob, did the nurse take your temp.? Was it the same on both ends? Don't let her use the same thermometer. Oh, sorry, that's too personal. If a 16V 1100 eng. works great in a 8V GS1000, wouldn't an 8V 750 eng. work just as well in a 16V GS750, if that were the case.

[TeamDar]

You guys are all confused. I just left Norm’s with a 1980 16V 750E engine. The only real difference I see is in the head design. It is a 16v. Promise.

sorry Rob. No 1100 this time.

thank you Norm

The only difference should be the number of valve cover bolts. Dar

[storm 64]

It was nice meeting Rich today, a very nice guy. Well, last night when I was removing the exhaust header pipes, yep you guessed it, three broken exhaust bolts... I got up early this morning, pulled the head. I then took it to the shop to drill out the busted bolts. When Rich got there I had a good jump on the job. I didn't want to keep him any longer than necessary. Then we went back to my house to finish pulling the engine. All in all it went pretty smooth. I hope everything works out for Rich. 👍

[GSXR7ED]

You guys are all confused. I just left Norm’s with a 1980 16V 750E engine. The only real difference I see is in the head design. It is a 16v. Promise.

sorry Rob. No 1100 this time.

thank you Norm

Well, I guess that’s putting it nicely...confused...appreciate the lower level degradation. lol (I’m sincere when I say that so please don’t be offended)

Good job, Norm...you going out of your way to clean up prior to Rich’s arrival...and then expediting the bolt issue so as not to keep Rich waiting too long.

Glad it all worked out!

Ed

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[Rich82GS750TZ]

Yep, Norm certainly went above and beyond to help me. He’s the first GSR member I’ve had the pleasure to meet in person. Maybe someday I’ll get to a rally, if I can stop sabotaging my own bike.

Thank you again Norm. With a little help from you and the rest of the great folks here, I’ll have my bike up and running before too long. I return to work tomorrow, so it’ll take some time working a little every evening and weekends.

Also want to thank the person ahead of me in the Dunkin’ drive through for paying for my coffee. That was so nice. And unexpected.

[GSXR7ED]

That’s so cool!

Posting pic of some GSR brethren...meeting for a good cause...helping a member out!

Ed

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[dorkburger]

Always nice to see some goodness.

[Rich82GS750TZ]

When the engine is over-revved the valve train floats. The rocker arms are not following the cam lobes smoothly anymore but are being hammered open and slammed closed. All of this causes wild harmonic vibrations which can loosen the valve adjusters and even cause the screws or nuts to back out. When an adjuster screw separates from the rocker, especially the ones closest to the cam chain tunnel, they frequently get drug down with the timing chain. When the screw gets jammed between the crankshaft sprocket and the chain the sprocket teeth jump the chain links throwing camshaft timing out of synchronization. The results can be bent valves or in this case the valve to piston interference was significant enough to break the rocker arms. I have personally found valve adjuster screws backed out on engines that the owners admitted to missing a gear and severely over-revving the motor. In one instance several screws/nuts had fallen out of the rocker arms. All but one screw was still laying in the head. The last screw was still in the crankshaft sprocket area and had cause the cam timing to jump time. All 8 of the intake valves were bent and required replacement. Dar

Dar
Thank you for this explanation. It leads me to believe that I'm 99.9% positive that all of my adjuster nuts were tight, and that I'm 100.1% sure it was because of the way that I routed the clutch cable, and it's interference with the throttle linkage on the carbs, that caused by bike's demise. Totally my fault either way. Just good to be able to piece together this series of unfortunate events.

[GSXR7ED]

I’m interested in how you routed your throttle cable that caused this demise.

Ed

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[Rich82GS750TZ]

I’m interested in how you routed your throttle cable that caused this demise.

Ed

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See posts 34, 35 of this thread.

https://www.thegsresources.com/_forum/showthread.php?258181-Before-I-start-clutch-work

The piece of bent wire I so cleverly made up did a fine job of keeping the clutch cable away from the valve cover/engine. It kept the cable so far away from the engine that it pushed it in the the path of the throttle linkage. I was getting more confident in my clutch repair and the last time I pulled out, I poured on the throttle pretty hard, the throttle linkage stuck and when I left off, pulled clutch to shift to 2nd, the throttle was hanging. Never got it into second, then...WEEEEEEEEEE, CLANK, CLANK, CLANK, CLANK, CLANK, CLANK, CLANK, CLANK, CLANK. Hit the kill switch. Got it started, limped the bike for 1/2 Mile (I measured it yesterday). That was all she wrote. And here we are.

[GSXR7ED]

Ohhhhhhhhh!!!!!!!!!!

Yeah, I wondered why that guide was attached to the carbs...it's very important...APPARENTLY!

Thanks for explaining.

Ed

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