Thursday, September 25, 2014

Water flows downhill!

Water flows downhill! So does gasoline. So why the need to pump gas downhill from the tank to the carb? Which is worse, ignorance or apathy? Who knows, who cares. There is no need for the fuel pump.

Following the information in this forum thread (sorry, registration required), I removed the fuel pump. What do you think? BIG change in the looks on the left hand side.

In the beginning, Yamaha put on this huge fake boob cover.


This boob is plastic chrome. And even the little tab that holds it at the top broke off leaving just the screws at the bottom to hold it on. On a real Harley, this chrome blob is the horn which serves some purpose. But the fake boob covers some really ugly stuff.


This stuff is a fuel filter and fuel pump. The pump seems to be needed to pump the gas DIRECTLY ACROSS to the carb on the other side. The thread cited above suggests God-created gravity can flow fuel sufficiently to the carb if the small float bowl jet is replaced with a larger variety.

Look how much cleaner when the ugly stuff is removed!


Now a little detail. The stock jet is a #2.  I used a later recommendation to use a #3 jet from a different Yamaha applications and ordered it. It was around $30 with shipping. Don't pay much more.


I won't bore you with the jet installation. Just don't lose any parts during the installation. I found a small o-ring on the ground after I had reinstalled the tank and carb. I was able to take just off the fuel bowl. The o-ring is for some kind of accelerator pump.

Here's the final picture.


Some notes where I did different things than the thread. I reused the metal fuel line that comes across between the cylinders and I reused the exiting filter and fuel line. The only expense was for the jet and a 3mm hex wrench to take the fuel bowl off.

Oh, I also had to relocate the choke from just under the fuel pump bracket. I cut off the existing choke brake and moved the choke to the RH side on the air cleaner mount. YMMV depending on your air cleaner setup.



This was a very worthwhile modification. It visually opened up the cluttered left side of the engine making it open clear through. It also eliminated a source of failure, the fuel pump.

What do you think?

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