Weird, what have I done wrong ?

[Spud]

Doing a 10,000 mile service on my single spark 1150.
Pulled it apart to do the tappets and have followed the guides from you tube etc and set them up using 4 feelers at once.
Put it all back together and it sounds rough as owt (Yes' I'm from 'up North)
Even sounded different when I fired it up and the throttle bodies damn near impossible to balance nicely (they were ok before)
So I've pulled it apart again (after checking plugs etc) and the gaps on the left side now seem way in excess of what they should be, I've not checked the right yet.
It is slightly warm still, so I've left it ready to check them again in the morning.

Is there something obvious I might be missing or done wrong ?

I'm not a total newbie with mechanical stuff and have always serviced my own cars, including ones with rockers and lock nuts and never had any issues before.

Any pointers gratefully received

 

[Slipperyeel]

My first thought on reading your post is that you've not got the valves at the right point for check/adjust (thru should be "on the rock" as I've heard it described)... In short, are you convinced you had each head at tdc when you checked/adjusted?

How were the adjustments? Did you have to adjust much or just a fraction?

 

[Spud]

My first thought on reading your post is that you've not got the valves at the right point for check/adjust (thru should be "on the rock" as I've heard it described)... In short, are you convinced you had each head at tdc when you checked/adjusted?

How were the adjustments? Did you have to adjust much or just a fraction?

Thanks fr the reply ....

Both sides were done with the OT bang in the window and checking the rockers had "play" before starting. And to be fair, very little adjustment seemed to be required, which is why I'm a little "confused" by it

 

[Flipfly]

When you say it is rough, is it misfiring or just noisy?

 

[Slipperyeel]

Ok. Doesn't sound like my first thought

My other thought after replying was the dreaded un-seated throttle cable at the throttle body...but you don't mention anything that suggests that could be it.

Did you take off the tank as a part of your service? If it's not the Throttle cable, maybe you've disturbed/not re-connected something (plugs?).

Grabbing at straws!

 

[Flipfly]

Ok. Doesn't sound like my first thought

My other thought after replying was the dreaded un-seated throttle cable at the throttle body...but you don't mention anything that suggests that could be it.

Did you take off the tank as a part of your service? If it's not the Throttle cable, maybe you've disturbed/not re-connected something (plugs?).

Grabbing at straws!

That's where I was going.......we've all done it

 

[Spud]

That's where I was going.......we've all done it

Not taken the tank off yet, and checked just in case. No misfire but "lumpy" and a different sound somehow.......

 

[Slipperyeel]

Have you pushed the plug caps home (I'm taking for granted you took the plus out to do the valve clearances?)

 

[Spud]

Have you pushed the plug caps home (I'm taking for granted you took the plus out to do the valve clearances?)

Yep, checked that too....... :/

 

[Slipperyeel]

Re-read your post.

Are you 100% the throttle cables are seated properly? I mean RH side.

If you can't balance them (I scimmed over that detail when I first read it). Then that's an obvious place to start. .

 

[Spud]

Re-read your post.

Are you 100% the throttle cables are seated properly? I mean RH side.

If you can't balance them (I scimmed over that detail when I first read it). Then that's an obvious place to start. .

I thought they were ok. I'll check them again in the morning ....

Thans for all your help, I'll let you know !!

 

[Steptoe]

Thanks fr the reply ....

Both sides were done with the OT bang in the window and checking the rockers had "play" before starting. And to be fair, very little adjustment seemed to be required, which is why I'm a little "confused" by it

With the cylinders reading at TDC on the flywheel only one is on the compression stroke . You have to rotate the engine to adjust the "other" cylinder when that is also on the compression stroke - it sounds like you've adjusted both when only one cylinder was at TDC. Having dislodged throttle cable wouldn't have caused your valve clearance gap to increase

 

[FastestGSA]

Two pennies worth!

Check your spark plug dap. Possible knocked it or the the wrong replacement.

Perhaps you mixed up the exhaust and inlet clearances!

http://www.jvbproductions.com/Wethead Valve Chart008 copy 2.jpg

https://sanjosebmw.smugmug.com/Other/Tech-pictures/



Sent from my iPad using Tapatalk

 

[Pekkavee]

Check

Pekka

 

[moonhead911]

With the cylinders reading at TDC on the flywheel only one is on the compression stroke . You have to rotate the engine to adjust the "other" cylinder when that is also on the compression stroke - it sounds like you've adjusted both when only one cylinder was at TDC. Having dislodged throttle cable wouldn't have caused your valve clearance gap to increase

x2 ......

 

[GS Addict]

With the cylinders reading at TDC on the flywheel only one is on the compression stroke . You have to rotate the engine to adjust the "other" cylinder when that is also on the compression stroke - it sounds like you've adjusted both when only one cylinder was at TDC. Having dislodged throttle cable wouldn't have caused your valve clearance gap to increase

+1 Plausible for sure

 

[Slipperyeel]

With the cylinders reading at TDC on the flywheel only one is on the compression stroke . You have to rotate the engine to adjust the "other" cylinder when that is also on the compression stroke - it sounds like you've adjusted both when only one cylinder was at TDC. Having dislodged throttle cable wouldn't have caused your valve clearance gap to increase

You've explained that much better than I did!

This is what I meant in my first reply

 

[Spud]

Well, I've done the clearances again and taken my time with it.
The bike starts ok, and I can balance the throttle bodies up for idle until they're pretty much identical.
However they won't balance as nicely as it used to be whilst applying throttle (if that makes sense) One side, the left, always seeming to want to "open" first.
Once at a fixed RPM, say 3000 it will balance out spot on again.
But, it still still doesn't feel, or sound as smooth or nice as it did. It's driving me nuts.
The only thing I can think of (and I hardly dare ask) is, I had a young lad from down the road wanted to help, so with precise instructions I let him turn the engine with a spanner on the front. He had strict instructions on clockwise looking from the front, but still managed to get it wrong, and turned the engine the wrong way briefly.
Any chance that this has messed up the valve timing or anything? Is it something that happens on these ?
Or am I getting Paranoid.

 

[Hay Ewe]

seeing as we are clutching as straws......

If he turned the engine the wrong way, maybe the bolt holding the cup for HES system has come loose and the cup is not giving consistent instructions to the ignition system.
(trying to write that simply - but failed)

Summary - check the cup is located properly on the front of the crank and the bol is done up good and tight

 

[notagser]

Sounds like something isn't right with the throttle cables.
Is the cold start on or off?