Big flat spots.

[electric_monk]

My 89 100gs has just had the after market Y piece and tailpipe replaced with a collector box and original tailpipe. The bike now has a big wide flat spot which is particular bad in 5th gear, from 4 to 4.5 thousand rpm.
I'm hoping that this can be attributed to carburation issues and is not indicative of something else.
Any advice would be most welcome.

 

[Rob Farmer]

I'd check the needle position. They often run better with the needle a notch down with the y piece fitted but this will leave you running very weak with the standard collector fitted.

 

[Ogmios]

I'd check the needle position. They often run better with the needle a notch down with the y piece fitted but this will leave you running very weak with the standard collector fitted.

Told ya so.
~~~
Og, amazed that i knew WTF i was talking about.