Singh Grooves on a Kawasaki KLR 650

[nrlightfoot]

I'm thinking about cutting some Singh grooves in the cylinder head of my KLR 650 motorcycle in hopes of getting better fuel mileage, does anyone know if just cutting the grooves and doing nothing else will improve the fuel mileage?

Here's a picture of my cylinder head, any recommendations on how or where to cut the grooves, and should I aim them right at the spark plug?
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[threepiston]

I'll let someone else decide where to put the grooves, but you have a good pad to work with for a 4v head.

Welcome to MPG Research.

[mpgmike]

Assuming you have a flat top piston, what you said should give you pleasant results. The only thing I'd recommend is to radius the sharp edges leading up to the squish pad. That works well also.

Mike

[threepiston]

You'd better hurry, but take your time.

It's the time of year that the grass keeps getting greener.


X2 on Mike's radius idea... Been covered before here.

[nrlightfoot]

Here's the after picture of the grooves:

I hope I did them right, cause there's not much I can do to fix them now!

Anyway, I'm going to install some new valves, which is why the head is off at the moment. Should I set the valve clearance near the top or the bottom end of the spec for the best fuel mileage, or doesn't that matter?

[Pinhead]

The grooves look good. Now go ahead and radius the edges of the squish lands. It's been covered on the forum before, called "Edging."

EDIT: Here's a link to one of the articles that Mike wrote on Allpar.com
http://www.allpar.com/fix/holler/head-porting2.html