Is this engine chatter normal with auto CCT?

[Smash]

first off a huge THANK YOU to CaptonZap for putting in so many hours at our place on Saturday! He did an incredible job teaching Karla how to do more stuff on her bike (I sat back and fetched tools, etc) and we got more done in a few hours than we ever thought possible!

Took the bike out yesterday for about 175 miles of twisties and she ran very well. Got about 42mpg. Was hoping for a little better doing some easy mountain riding, but hey that's a big heavy bike!

I do have a question though... We installed a CCT off a Vision 550 and we're getting a new metal chattering noise. Is this an expected noise? It becomes very rapid above 3k. Try to hear it in the video, it's the metal vibrating noise.

Any thoughts on this? We heard it before the ride and it's the same after the ride. No smoke, no noticeable issues, just this noise.

http://www.youtube.com/watch?v=6ZJkQzLizvQ

[natemoen]

I did not hear anything like that on mine but I will say that there is more metal to metal contact with ANY of the auto cct's just because the oem cct had a little composite foot at the end of the plunger and the auto cct's do not have that, it's just the metal plunger sticking in there.

Did you ever check your valves shims?

[Smash]

Yep we sure did. Had to change two shims to get everything within spec but had to go a little loose on one intake valve (better than too tight, which is what it was).

Ugh ok. Was hoping everyone would say "yep that's normal."

[CatatonicBug]

That sounds like normal valve chatter to me. Since you adjusted the valves, that's is what I would have expected.

If you got 42mpg running twisties of ANY kind, you're doing incredible!! That kind of economy is usually reserved for flat-land constant-speed distance travel.

[Smash]

Ok thanks buddy. Man that's noisy! Haha, I guess it makes sense though, 1-3 intake and exhausts were within spec, but intake AND exhaust on 4 were tight. Which, would make it quiet... It does seem overly loud to me though, I don't remember CZs being that loud when he pulled away from the house, but I wasn't listening (and he was far away).

LOL about the fuel mileage. We were running them real gentle as she gets used to riding a street bike. Not running the stickiest of tires either. Helps that she's pretty darn tiny!


Anybody else want to chime in?

[natemoen]

Yeah I would say pretty normal especially since you said the valves were tight and now they are looser. And yeah 42mpg is really good!!

[Smash]

Thanks guys!

I'll let Karla know about the fuel mileage. She was pulling 36 before going to/from work, I am betting that will improve now we have the valves right, the carbs synced again and we were FINALLY able now to get the bike to keep an idle!! YAY!

I did warn her that although her bike is bigger, more comfortable, cheaper and arguably better looking than mine, I will be the fuel mileage king! (Hey, I gotta win at something right??)

[James England]

IMO that doesn't sound quite right. I know that youtube isn't the best place to get hi-fi sound but it sounds to me as if you have a pronounced metal 'tinging' sound. Whilst the valves are noisier than some other bikes, I don't think they are that noisy.

I considered putting an automatic CCT on mine and decided against it. I didn't like the idea of constant pressure on the steel blade and wasn't convinced that the auto ones exert the same amount of pressure as the original. More pressure would, I reasoned, lead to more wear on the chain. You said it's a new noise since putting the CCT on. I suspect there's something not right about it. If it didn't do it before, I'd put the OEM one back and see if the noise goes away.

[Smash]

It did not make that metal noise before the CCT, but we also adjusted the valves at the same time. We have one intake valve measuring 0.007 which is a bit out of spec. We will crack her open again, probably tonight, to take one more measurement to make sure it's not any more out of spec after yesterday's ride. We took it to 0.007 because it was originally at 0.035 which was definitely too tight. Measured always with a completely cold engine.

[James England]

It did not make that metal noise before the CCT, but we also adjusted the valves at the same time. We have one intake valve measuring 0.007 which is a bit out of spec. We will crack her open again, probably tonight, to take one more measurement to make sure it's not any more out of spec after yesterday's ride. We took it to 0.007 because it was originally at 0.035 which was definitely too tight. Measured always with a completely cold engine.

On my XS1100, 7 of the 8 valves were tight. One was OK. I did them a couple of days ago and double checked the clearances. All fine. The engine actually runs quieter..... I know it's not supposed to but it does. I even mentioned it in my post about the job. You seem to have a definite tick tick ting sound going on.

[Smash]

Yes. Not knowing these engines though I don't know if its normal, and youtube was the only way I knew to get it out there.

[3Phase]

Smash, the valve train sound in your video seems about the same as the sound my '80G engine makes with the Venture tensioner.

Keep your ears tuned and listen for changes in the sound, for better or for worse, but the automatic cam chain tensioners are noisy(er) than the stock tensioners.

[Smash]

BWAHAHAHAHAHA.

Ok, we officially had a "duh" moment.

We completely forgot to repair a loose header clamp thingy. Those metal round bits that secure the header to the block. One of them is missing a bolt. That's what's rattling. I had taken one to ACE to see if they had something that would work, which they didn't.

THAT'S WHAT'S RATTLING.

Haha, yep, we feel rather

I'll go back to the dealership tomorrow to see if I can order one of those weird bolts from Yamaha unless someone has another source.

[3Phase]

THAT'S WHAT'S RATTLING.

Ah, I was listening to the valve train, not the exhaust. The valve train sounds okay to me.

[Smash]

Lol I'm not that good.