Bike running fast revs

[declan]

@calum the cable has come out the carb again why has it done this again?

[Calum]

@declan Dunno mate. Have a look

[declan]

@calum no idea why it was out it’s back in again do you have any tips to fit the carb rubber to the air box as I have a right shit time struggling to do it

[Calum]

@declan Oh dear.

Yes, take the air filter out.

Work from inside of the box outwards.

Use a soft spudger (dull flat edge NOT A SCREW DRIVER!!!!!) to prise the angle of it into the box.

Once you learn how to do it, it's easy.

Do not force it in. It will go in without hesitation once you have that technique down

[declan]

@calum I’ve done it twice now and I hate it lol

[Calum]

@declan Technique my boy! It's all in the technique.

[declan]

@calum lol got it in pretty easy but it’s still revving to the moon no air leaks cable is 100% free safe to say I’m pretty clue less and pissed off

[Calum]

@declan If it was working fine before hand, then it's going to be something properly simple. Rushing isn't going to fix the problem.

My guess is that it's an air leak, because this is the most common type of problem.

The inlet manifold gasket should be renewed. As said previously, these are prone to failure upon renewal.

You said your inlet had a split in it, have you replaced the inlet? Sounds like it's past its best and I would renew it with a new one whilsy Yamaha still make them...

[declan]

@calum your right it just has to be an air leak there’s no other explanation so if I use wd40 should I be looking for bubbles as rpm change will not be reliable

[Calum]

@declan The added WD-40 should be combustable, bringing the mixture down so the idle should drop.

It'll be something simple. It might be that the reeds are installed incorrectly. Too Much overlap at the end etc...

[declan]

@calum checked before install they were a perfect fit and actuall were the same ones that were already in there

[declan]

@declan should there be a gasket between the engine and the reed block spacer

[oldman]

Yes

[Calum]

@declan That was literally one of the things I rattled off before hand...

[declan]

@calum yes but my bike doesent have one @oldman is there two of those gaskets?

[Calum]

@declan No

Item 8 and be sure to buy either genuine or Athena.

As said, it's common for them to go there on these bikes because people either do naff copies, use inferior parts or reuse gaskets.

[declan]

@calum see I have a gasket underneath the inlet manifold is this in the wrong place then Bud?

[Calum]

@declan The inlet is "Rubber" therefore doesn't need a gasket.

The Engine is metal and therefore needs a gasket.

So yes. As I said at the start, it's an airleak. It's where I suspected it to be.

[declan]

@calum I’ll get the gasket switched round tomorrow and we will see how it goes thanks for you time mate

[Calum]

@declan As said, really that gasket should be renewed!

It's your bike do as you please, If you were a more experienced engine builder, I would defer to your judgement on whether or not that gasket could be reused.

But as you got it the wrong way around, I would say you're not too experienced.

It may work and cause no problems, it may fail on you when you're out and miles from home.

I would renew the gasket personally, saves yourself from headache down the line.