CA78 struggles going up hills

garncarz · Post by **garncarz** » Mon Jun 16, 2014 9:49 am

Here's the data: 1966 CA78, 72 degree spring day, long slow rise hill, 215# rider, 130 main jet, needle jet clip at 2nd from the bottom, 3rd gear, half throttle.

What happens: Adding throttle up to and including WTO gets no more power.

Question: Have I simply used up the 23 bhp or is something amiss?

Thanks in advance.

russ · Post by **russ** » Mon Jun 16, 2014 4:45 pm

have you checked your points and time ?

garncarz · Post by **garncarz** » Tue Jun 17, 2014 12:07 pm

Yep. Set up per Ed's specs.

G-Man · Post by **G-Man** » Tue Jun 17, 2014 2:33 pm

What happens if you shift down to 2nd?

G

garncarz · Post by **garncarz** » Tue Jun 17, 2014 7:13 pm

G-Man wrote:What happens if you shift down to 2nd?

G

More rpms upto 3/4 throttle, then the same.

G-Man · Post by **G-Man** » Wed Jun 18, 2014 3:02 am

If the ignition and valve (timing and clearances) are good and the general state of repair of your motor is OK then you are only left with the carb.

What do your plugs look like?

You may need to look at the needle position and main jet to get things working nicely at higher throttle openings.

G

brewsky · Post by **brewsky** » Wed Jun 18, 2014 4:25 am

Did you install an aftermarket carb kit?

If so, some came with #130 main, which was way too rich for mine....stock was 120.