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I've never read of any SV racers in the day running heavier oil in the dashpots to gain better acceleration. To the contrary, they ran stock, ultra-thin viscosity 'sewing machine' oil - or none at all.
Don:In case anyone using CD 150's has a problem with oil disappearing rapidly from the dash pots:
TE/AE Factory Service Bulletin forum section:
https://teae.org/?p=1250
Don:
I can't open the image.
Because when you’re racing you’re never really coming off low RPMs, where you’d need a pump (and feel the flat spot the most), and at high RPMs you’d want that air valve to pop up quickly for best throttle response. Plus, the cam is of an entirely different configuration such that bottom end performance isn’t emphasized. Racing setups are very different than Street.
Maybe because it is chilly in England. I used to use ATF in carbs for Triumph TR-4A, worked OK in 1971....Why was the factory recommended oil ultra light-weight?
Thanks Don.Thor,nks
Interesting, it's not an image but a page link for a page on Tiger East/ Alpine East web site.
Search TE/AE website home page. On the orange site address bar at top of page, drop down menu under "Tech Tips", click on "Factory Service Bulletins.
On that page's listings under section "D - Fuel", look for Bulletin 68-14: Zenith C.D. Carbs Loss Of Oil From Dash Pots.
This info is on the web in several places, so you could just search the bulletin title to get the information. The TE/AE page seems to have a better copy of the one illustration in the bulletin.
Hope this helps,