WHat revs to sync TBS at?

[Taipan]

Hi All

I cant seem to find a definitive answer to this? So what revs do you sync your TBs at?

Many thanks.

 

[(RIP) Kaister]

idle and again at 4000

 

[Tsiklonaut]

Me on the whole rpm range - from idle to 6K. And still, they go asymmetric after you set them in sync engine freely running on neutral gear compared while you "load-drive" the bike around - i can feel it. So ideal would be if you sync them while on driving

 

[(RIP) Kaister]

o ideal would be if you sync them while on driving

Absolutely !!

20 years ago a custom bike builder called 'Uncle Bunt ' ( aka John Reed ) built a 4 cyl bike that had 4 small vac guages on the top yoke ( or fairing ? )

it should be a piece of piss to do with just 2.

 

[Sergeant Pluck]

So ideal would be if you sync them while on driving

You kind of can - I strap my twinmax to the tank, jubilee clip the tubes on and check the settings on the move

 

[littleredrooster]

Yup - much more accurate result is obtained when you can put the engine under load. Get it into 3rd or 4th gear and check through 1500 - 5000rpm. Makes a big difference. Once you have set them this way, next time is much easier. Simple vacuum gauges bungeed to the crossbar are much easier to see on the move than a Twinmax.

 

[Taipan]

So what do you do, stop and make an adjustment then recheck and repeat as neccessary etc?

 

[Tsiklonaut]

So what do you do, stop and make an adjustment then recheck and repeat as neccessary etc?

Yup!

 

[Straypuss]

Takes me back

Uncle Bunt Bay Area lowrider..the only chop I have ever wanted

 

[Taipan]

Yup!

Cool. I'll pick up a set f vacuum gauges and give it a go. Thanks for the replys.

 

[jkersh1]

From the "R1100GS/R1150GS Maintenance Manual" http://www.ibmwr.org/r-tech/oilheads/index.shtml the author recalls that BMW Guru Paul Glaves point out that the high speed adjustment will be more accurate just off iidle 1200 - 1400 rpm, because any difference between the throttle plates will be a higher percentage difference in the airflow and vacuum.