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General Category >> Rubber Side Down! >> Replacement Raptor petcock outlet size
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Message started by eddytor on 05/17/20 at 08:13:18

Title: Replacement Raptor petcock outlet size
Post by eddytor on 05/17/20 at 08:13:18

I have a Savage LS-650 year: 2006

I bought a replacement petcock that doesn't use the vacuum line. It fits the tank but the outlet does not match the carbs inlet. The petcock fits the tank.

I got the Yamaha raptor 660 YFM660R model as described on the forum in another post.

Carb - approx 9mm
Petcock - approx 6.5 mm

My question is if I made this setup work would the flow rate of gas be insufficient?

I noticed on the web that the size of the outlet for the petcocks are not specified.

Thanks in advance for your thoughts,
Ed

Followup: I have read all the response posts. The consensus seems to be that I should get the larger correct size which I will do. Thank you all for your responses.

Title: Re: Replacement Raptor petcock outlet size
Post by eddytor on 05/17/20 at 08:14:07

The pics for the inlet and outlet sizes are at:

http://www.tornick.com/categories/suzuki-savage-LS650/

Title: Re: Replacement Raptor petcock outlet size
Post by justin_o_guy2 on 05/17/20 at 08:45:34

If YOu didnt buy an Official Yamaha part, you didnt get the one that works.. The cheap knockoffs have smaller diameter outlets, and they dont flow Wurfashit..

Title: Re: Replacement Raptor petcock outlet size
Post by Hiko on 05/17/20 at 15:59:41

I have had a non raptor petcock on my bike for about 2 years now
Today I decided to examine the thing
It has an outlet inside diameter of 4mm the carb has an inside diameter of 5 mm
The tank is half full and I timed one litre out of the hose 1min 40 secs
My bike on open road cruising burns 4litres per hour
The petcock on test will pass 36litres per hour
I am happy with it so far

Title: Re: Replacement Raptor petcock outlet size
Post by verslagen1 on 05/17/20 at 16:56:06

In my experience, it'll be fine riding around town.
On the superslab, you'll start running lean on the top end.
And then you'll go up a hill and it'll cough...

Title: Re: Replacement Raptor petcock outlet size
Post by Hiko on 05/18/20 at 00:20:43

Yes well I guess average flow rates dont tell us much about wide open throttle flow rates
I am a conservative rider so maybe I just havent noticed any faltering

Title: Re: Replacement Raptor petcock outlet size
Post by zipidachimp on 05/18/20 at 14:20:03

5/16" tubing works just fine !
Cheers! 8-)

Title: Re: Replacement Raptor petcock outlet size
Post by Dave on 05/18/20 at 16:15:56

One of the other problems, is the potential air lock that can happen as the hole size gets smaller. When doing a flow test the unrestricted flow can push the air out - but when the tubing is installed and the bike is only flowing a small amount.......the air can get trapped and block the flow of fuel. This really becomes a problem when you install a small plastic inline filter, as the plastic nipple has a thick wall and the hole is small and restricts flow of fuel....especially when a bubble gets trapped!