Head scratcher….

So this is a puzzling one… I’ve fully assembled both carbs. The fuel pump is sat considerably lower on the carb with the new parts.

I’ve compared the fuel pumps and they are identical. The difference in height can only come from the alignment of the cam. So it’s either the shape of the cam arm (they looked the same when offering the parts to each other) or the angle of the cam arm on the spindle.

The spindle came pre-drilled, as did one side of the cam. So the cam with the lower pump is at the stock alignment. I wonder if it’s a trick for those drilling there own spindle to make the fuel pump action more aggressive by drilling at a slight angle?

I suppose it’s possible there is such a thing as a performance cam. Bit of investigation required!

Leave a comment

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

<span>%d</span> bloggers like this: