Horizons Unlimited - The HUBB

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-   -   can the cam chain slack produce failures? (https://www.horizonsunlimited.com/hubb/yamaha-tech/can-cam-chain-slack-produce-67846)

docsherlock 28 Dec 2012 14:50

Quote:

Originally Posted by Bigfoot 2 (Post 405445)
Come on, guys! Doc, that was really uncalled-for and not suitable for the best and most helpful Yam-trailbike forum out there. Kindly do us all a favour and delete that post. For the record, I'm sure I speak for more HUBB users than just myself in that we do appreciate your (usual) input.

Rich, I don't currently see your reference to changing the chain - please be more tactful when replying to helpful riders. I don't think you meant to sound rude but short lines of text can be such a blunt instrument.

Er, yeah, I'm expecting (another) infraction for that one, but then again, he probably deserved it given the lack of appreciation for the basic lessons on mechanics that solved his problem that he couldn't be bothered to say "thanks" for, topped off by a fairly obvious ingrate comment.

Oh, well, such is life.....

rich7 28 Dec 2012 16:02

I apologise if I said or did something wrong. It really wasnt my intention. Since English is not my mother tongue I might have hurt somby's feelings.

Maybe I did not express myself clearly. I appreciate every input of you all I really do.

Im not that kind of person who does not care about others.:(

docsherlock 28 Dec 2012 16:59

Hi Rich,

Thanks for that - no worries.

Perhaps I did not appreciate the language barriers, so sorry if I offended you.

Hope the bike works out.

DS

Jens Eskildsen 28 Dec 2012 17:55

Check the floatheight in the carb, could be the issue if incorrect.

rich7 29 Dec 2012 00:26

As for the float, what in your experience might be happening? Too high or too low? What's the reason to go off?

Jens Eskildsen 29 Dec 2012 07:14

My guess is the fuel level is set too high, and overflows when you move the bike around, but im shooting in the dark here.

rich7 30 Dec 2012 00:55

Uhmm, I have not had the time to do the check but I'll definetely do it, thanks.

Magnon 30 Dec 2012 11:39

Usual cause for the engine to stall when the throttle is closed quickly is an air leak at the manifold. This may be very small so it won't affect normal running although it can sometimes make the bike harder to start or it will need more choke than usual.

If you have something like a Scottoiler connected to the vacuum take off point check the pipe is in good condition. Check any hose clamps are tight and if it's a rubber manifold check there are no splits in it.

rich7 30 Dec 2012 17:10

Really, really interesting tell me more pls. It does not have any problem starting; I does not even need any choke at all. Scottoiler? what exactly is this?
The four clapms are ok, not leaks at all. one more thing, the bike stalls even in neutral and at iddle, just a sudden push like pushing forward and pulling the brakes makes it stall.

docsherlock 30 Dec 2012 17:32

Quote:

Originally Posted by rich7 (Post 405703)
Really, really interesting tell me more pls. It does not have any problem starting; I does not even need any choke at all. Scottoiler? what exactly is this?
The four clapms are ok, not leaks at all. one more thing, the bike stalls even in neutral and at iddle, just a sudden push like pushing forward and pulling the brakes makes it stall.

I think you need to adjust your clutch, as per my previous post; it sounds like it is dragging.

Have you tried this, as per the repair manual?

rich7 30 Dec 2012 18:50

Excuse my ignorance, I do not really understand the issue with the clutch since I have mentioned that the bike stalls even in neutral not driving it.

BlackDogZulu 30 Dec 2012 21:54

Let's be clear: you push the bike forward in neutral, stop it with the brakes, and it stalls? I can think of a couple of reasons for that, but I will wait until you confirm this is actually what is happening.

Scottoiler - an automatic chain oiler that feeds oil to the drive chain by gravity, worked by a valve which is actuated by inlet manifold vacuum, so it only delivers oil when the engine is running. A leak in the pipe between the oiler and the inlet would allow air in to the mixture, leading to a weak mixture and possibly running problems.

If your bike will start without choke then something is wrong. It sounds to me like a very rich mixture, which would be confirmed by high fuel consumption and black exhaust smoke and/or soot around the tail pipe.

A plug reading would help narrow this down.

docsherlock 30 Dec 2012 23:13

Quote:

Originally Posted by rich7 (Post 405716)
Excuse my ignorance, I do not really understand the issue with the clutch since I have mentioned that the bike stalls even in neutral not driving it.

Synchromesh gearbox; cogs are spinning but not engaged on shaft in neutral.

It's a five minute job (or less) - just try it, even if you don't understand it. You don't understand carbs either but my advice solved that problem.....

rich7 31 Dec 2012 01:21

You push the bike forward in neutral, stop it with the brakes, and it stalls? yes, it is what it does. At any sudden stop it stall, whether in neutral, at any speed, with the clutch pulled. If I want avoid that I just have to engage the clutch and give a couple of (how can I express it?) throttle..??

One more thing, I live in Venezuela; the average temperature is 27 º C and almost every bike need not the choke to start.

Magnon 31 Dec 2012 13:00

Quote:

Originally Posted by rich7 (Post 405791)
You push the bike forward in neutral, stop it with the brakes, and it stalls? yes, it is what it does. At any sudden stop it stall, whether in neutral, at any speed, with the clutch pulled. If I want avoid that I just have to engage the clutch and give a couple of (how can I express it?) throttle..??

One more thing, I live in Venezuela; the average temperature is 27 º C and almost every bike need not the choke to start.

Could be an electrical problem - maybe you trapped a wire or slightly dislodged a connector when you last had the tank off


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