Vibrations

[devlin]

Okay. The other day while riding to work in the rain I stopped while doing a U turn around a traffic island. I was a little bit too close and when I put my foot down it got stuck between the bike and the traffic island and the bike fell over onto the island with me stuck under neath it. Finally extricated myself and righted the bike. Only damage I noticed was a slight scratch on the right muffler and a slightly bent bracket.

Now, I don't know if this is just a coincidence or whether having the bike on it's side while running has had an effect on something. The other event to note is that I have missed second gear a couple of times while giving it a bit. Watching the needle come back from beyond the 9000rpm is not something I like doing much.

Now the bike sounds a little bit more mechanical than I had noticed before. Agricultural even. and there seems to be an extra vibe in the bike when I get over 4000rpm, where as before it smoothed out a fair bit and spun nicely up the range. I know this is vague so maybe some of you might have some specific questions that I haven't pondered myself.

A couple of questions come to mind.....

What damage can be done while running the bike on it's side, around 15 to 20 seconds?

What bends when the engine is over revved, cams, something in the valve train or crank? (crank would be my assumption)

Also I have tried checking the oil numerous times and all I can see is a very dark window, even with 50w of halogen in there. Gone through the right procedure and I am sure there is plenty of oil as when it's on the rear stand it comes right up to the filler cap. Any suggestions besides draining it all out and measuring the right amount?

Any hints or suggestions appreciated.

[jpe]

A couple of questions come to mind.....

What damage can be done while running the bike on it's side, around 15 to 20 seconds?

What bends when the engine is over revved, cams, something in the valve train or crank? (crank would be my assumption)

Also I have tried checking the oil numerous times and all I can see is a very dark window, even with 50w of halogen in there. Gone through the right procedure and I am sure there is plenty of oil as when it's on the rear stand it comes right up to the filler cap. Any suggestions besides draining it all out and measuring the right amount?

Any hints or suggestions appreciated.

A. None, unless your extremely unlucky and something from the outside pokes a hole/bends something vital.

B. Valve stems. However there is a rev limiter somewhere at 9600rpm and nothing should happen before that. Normally... I usually rev the bike close to 9000 rpm on the track when I need to clear a corner or so.

C. You've got way to much oil in it. Drain and fill right amount, but don't forget, both draining bolts! And always check with warm engine after idling it for 30 secs to even out oil pressure.

[Max]

Definately way too much oil if it's coming up to the filler cap!

Have you had a look in the airbox after you tipped it over, you may have pumped a quart in there from the breather!

Missed shifts are common with the TRX and eventually result in bent / badly worn shift forks and/or rounded dogs on the gears. Make sure your shift linkage is smooth, tight and well lubed.

As for the over rev... Mine spent (well over) 4hrs at 10,000 during the endurance race (my OVER ignitor limiter hits around 10,500) without a hitch, sounds and runs the same today.

[devlin]

Thanks for some favourable comments. I might do a proper oil and filter change and check the air box as described. I might also 'spring' for a Factory Pro Detent Shift Kit from Wolf Racing here in Brisbane, to try and tidy up the miss shifts.

Still not sure about the vibes though. Could be an ever so slight miss if there is oil everywhere. I have a friend of the family who used to wrench at a Yam dealer not so long ago so I might get him to have a quick look see if I can't find something.

Thanks guys.

[phuk72]

As has been said - way too much oil in your motor.

TRX's have rev limters so no massive problem - and again as Max has said, I run mine consistently on the track (and the road!) up to 10k.

It is possible that you have done some crank damage by leaving the bike running on it's side - but for 30 seconds it is unlikely.

[bobtrx]

t rex if you set the gear lever to suit your foot angle when you are riding and be deliberate with your gear changes you won't need to get a PRO DETENT SHIFT KIT (*what ever it is ) Yamaha need a punch in the ring for their stupid oil check window . Best way I've found is check AFTER a ride when all is hot.

[oka]

are you sure the drive chain is not too tight , that can cause a bad vibe, apparently .

[devlin]

t rex if you set the gear lever to suit your foot angle when you are riding and be deliberate with your gear changes you won't need to get a PRO DETENT SHIFT KIT (*what ever it is ) Yamaha need a punch in the ring for their stupid oil check window . Best way I've found is check AFTER a ride when all is hot.

Fair call on the gear lever position and use. Unfortunately I have a left ankle which has lost a lot of it's movement over the years. Long story, but down to neglect. I have low strength in lifting up. I have changed to a race pattern which is a lot easier for me to use and for the most part it has solved the problem. Maybe I just need to do a minor overhaul of the associated parts as it feels a little vague sometimes and occasionally I can't find neutral.

The oil window is next to useless. Why couldn't they have put a dip stick on the end of the filler cap. 99% of the time these Japanese are smart buggers but that one eluded them.

are you sure the drive chain is not too tight , that can cause a bad vibe, apparently

I'll check that one. If it is too tight it binds the chain up so it is possible. It was running smoothly before so unless I've knocked the wheel it is probably unlikely. I certainly don't remember hitting anything to shift the wheel in the swingarm