78 Exciter Jetting & Reeds

[wls]

Wls,

Is this from a 78 Yam Manual. I know you posted this earlier but I have found nothing that correlates to the 152. On the Yamaha web site in the parts catalog they don't even list a #152 for the 78-81 Exciters.

On a 79 Service Data Sheet it shows #145 as Std. Same for the 1980 & 81

I'm not aware of anything different between the engines that would warrant a #152. Maybe since it was the first year going to that carb they went to the safe side of rich in the manual. The 76 & 77 Keihin slide carbs did have jets up in the #150 range. 78 on was the butterfly.

The 79 was 145 stock, the 78 had a 152 stock.
I have a 78 manuel with the 340/440's from the exciter A'a to the 440D supplement

 

[GP396]

Intersting

Good to know. Just has me wondering why they don't list the 152 in the parts manual anymore. Hopefully the 145's put me where I need to be with the Boyesen Reeds.

Anyone think that by 79 they figured out they were too rich with the 152 in the 78?

tx,