Knock, knock!

i don’t believe your tuner messed with timing did he? And you weren’t experiencing this after tune i don’t believe? if tuner didnt change timing it’s probably not knock due to fuel after all this time since tune, im sure you use 93 or whatever the high grade is. driveline somewhere you hooligan, give you a 200hp toy and look at ya, tearing stuff up You the man, tear up repair and ride like an alien in them mountains, nothin but a thang.
 
@warp9.9 mentioned the torsional bearing and @Speedy chimed in on another post where I first mentioned this and brought that up too. If that's it, I'm afraid to ask, what's involved in changing that out?

Here is what he had to say....
 
@warp9.9 mentioned the torsional bearing and @Speedy chimed in on another post where I first mentioned this and brought that up too. If that's it, I'm afraid to ask, what's involved in changing that out?

Here is what he had to say....
Ya lift the tail and pull it. The triumph way is drop the motor roll ot over. I say no matter which way drop the sump and clean it first do not use fuzzy rags the lint will clog the sump screens. Its work but I'm sure you're a qualified Rocket Scientist and could handle the wrenching easily!!
 
Reading some old posts where you chimed in. One was Doc Roc mentioning a sound (not the same) but at 3k rpm! Turned out it was his timing chain adjuster. I have one of Neville's. I checked the adjustment recently and believe it's OK. Another post mentioned clutch cable play. Lots of things to check out. I saved the sump gasket I removed when I did the rebuild and installed a new one. If it's not torn and looks good can I reuse, or do I need a new on every time since it's a dry fit? Not trying to be cheap, it's just I can move faster without waiting for parts and the bike is my primary means of transportation.
 
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@warp9.9 Torsional Bearing. OK, read up on it- dang, THAT looks like a ton o' fun! I'll need to buy a press and special swingarm removal socket. I'll ask later how to make that tool. I no longer have a shed, just a portable tent/shed over gravel shared with lawn mowers, etc. and just enough room for the bike.... Hoping it's something else, but you have good instincts so I'm preparing myself for the possibility. Today I reached down and held my hand where the drive shaft comes into the torsional damper. I didn't feel anything there when I felt it in my foot. Hoping that's a good sign that it's something else, and not anything worse.

@R-III-R Turbo pulling the clutch in slightly doesn't seem to affect it. Also, I checked my cable play this morning and it was OK. I noticed I could NOT get it to do it in 4th gear going downhill this morning. I couldn't test 5th because that stretch of interstate is a 55 mph speed trap. On most roads the surface is too rough to notice what I'm feeling. It has to be smooth like interstate. More tests on the way home to confirm, but seems like only 4th and 5th on flat or uphill, not down- What does that suggest? You said earlier, "Increased load is increased risk of knock." I need to get that octane boost or just buy some more.

@Speedy " A failing torsional bearing may exhibit episodic vibration whereas a failing u-joint would be prone to rhythmic vibration."
It's more of a thump, like hitting a rock or crack in the road, than a vibration but it does feel random and it's hard to hold it exactly at that position to keep it going.

@Kevin frazier No, the tuner didn't mess with the timing and I am using 93 fuel. "give you a 200hp toy and look at ya, tearing stuff up..."
I thought they were oversized sport bikes and should be ridden appropriately or they get soft, fat, and lazy like those other big bikes I see lots of out there - aren't they?
 
I removed my good luck charm bell. A bit worried that after all this that it was that banging back and forth, but NO. Back to other more complicated theories. On way back from work I confirmed that it does not present when going downhill and holding at 3K in 4th.
 
Well there's a clue. If it's a randomish thumping only in 4th and 5th, at 2900-3000rpm, and while engine is under some load.

Is it any worse when going up a hill, than when on the flat?
Is there any difference between how it feels in 4th and 5th?
 
Well there's a clue. If it's a randomish thumping only in 4th and 5th, at 2900-3000rpm, and while engine is under some load.

Is it any worse when going up a hill, than when on the flat?
Is there any difference between how it feels in 4th and 5th?

First of all, I just looked it up, but yeah, you're the guy- your "how to" videos on things like setting the timing were a huge help to me when I (complete newbie) did a Lush cam and piston upgrade. I think Lush was equally afraid that I'd blow up my bike due to inexperience- got lucky.

If you didn't see my shout out to you in my

DIY Beginner Upgrades Cams & Pistons - Lives To Tell The Tale

post, let me thank you again here.

Your questions- so, you'd probably pick up on those differences right away, but it's harder for me to say. Kinda like how my ex-wife would make me take fish oil supplements and then ask me if my joints felt better.. "uh, I think so..." Seriously, I think 4th and 5th are similar and probably about the same uphill as on flats. Sometimes I think I may have felt it in 3rd, but then not sure if that was a bump in the road- if so, definitely less frequently. One thing I noticed today and, I may need to repeat to make sure, is that it seems to happen when moving up to 3k, whereas easing down to 3K doesn't produce it. Let me make sure of that though.

I just got some Lucas Octane boost and poured about 1/3 bottle in (treats 25 gallons) with my low fuel light just starting to flash. I plan on filling up about 1/2 way tomorrow so I don't dilute it too much and seeing if it makes a difference.

Thanks