What Angle Helix Is This??????

[srx600]

It read 8BV90 on it. Anyone have any idea?

 

[mrviper700]

straight 39 degree

 

[yamaholic22]

straight 39 degree

i concur

 

[Aircraftman]

i need to find out which angle helixes i have by the yamaha part number. eg 8BV__ . does anyone have a listing or a link?
Thanks

 

[Turk]

The 1st number after the letter is usually the helix angle.
7=47
5=45
3=43

kinda like that.

 

[crewchief47]

http://www.totallyamaha.com/snowmobiles/aaTECH/drivespecs/camangles.htm