My Hel lines came in the post this week so I fitted them today. Good fit and went together well. I learned a few things which I thought I might share.

The rear line was quite difficult to bleed. I got it pumping easily enough but air kept coming through. I flushed about three litres of fluid through them (I did recycle the clean fluid by putting it back in the reseviour) and kept getting the occasional large bubbles, but mostly just fluid with lots of tiny bubbles in it. I eventually gave up but netherless brake feel is good.

Front brake was a little tricky. Air in the master cylinder made it impossible to bleed the calipers and lines. No matter how much pumping no fluid would come through. So, I constructed a little tool to help.

Required is a hose, two hose clamps and a tyre valve. Clamp the tyre valve in the hose. Fill the hose with brake fluid and attach the other end to the nipple on a caliper. Unlock the nipple and proceed to pump air in via the valve with a bicycle pump (making sure to close the nipple before the air has a chance to get in! The result is forcing fluid up the lines, thus forcing air out the master cylinder. I found my pump reading up to 60psi at one point! The result was the lever got some feel and I was then able to bleed the front brakes as usual.

Hope this helps! It will be kept as a tool in my toolbox.
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MC21 Honda NSR250. TYGA 300 conversion.