HAWK 250 Warm Engine hard to start "Sometimes" ???

[Ariel Red Hunter]

Originally Posted by Megadan

The 'Merica specs for the Honda CG125 engine is .003" plus or minus .001" for both valves on a cold engine. Which essentially works out to a range of .05mm to .10mm.

I do believe in a video not long after this one he had re adjusted his valves to .003" intake and .004" exhaust, which is what many here run. I set mine to .0025" and .003" and am quite happy with it.

Yes, you get a hair more duration with your valve clearances. I have recommended .003 inch inlet, .004 inch exhaust before because it is a safe number for engine break-in. I can think of no reason not to go a thousandths tighter on both valves after a thousand miles. But if I did that, I'd re-check my valve clearances more often. You may think a thousandth one way or the other doesn't matter, but a thousandth can be like 4-6 degrees on the quietening ramps....ARH

[Wild Dog]

Originally Posted by Ariel Red Hunter

Yes, you get a hair more duration with your valve clearances. I have recommended .003 inch inlet, .004 inch exhaust before because it is a safe number for engine break-in. I can think of no reason not to go a thousandths tighter on both valves after a thousand miles. But if I did that, I'd re-check my valve clearances more often. You may think a thousandth one way or the other doesn't matter, but a thousandth can be like 4-6 degrees on the quietening ramps....ARH

According to the owner manual of my bike, if you set them to .05 mm you should check the valves every 1000 km (620 miles) and if you set them to .08 mm you can go as far as 4000 km (2480 miles) before you have to check them.
But for my taste .08 mm is too noisy.

[culcune]

Get hold of NZbrakelathes...he will sell you a valve tool set direct from China.

[Megadan]

Originally Posted by Ariel Red Hunter

Yes, you get a hair more duration with your valve clearances. I have recommended .003 inch inlet, .004 inch exhaust before because it is a safe number for engine break-in. I can think of no reason not to go a thousandths tighter on both valves after a thousand miles. But if I did that, I'd re-check my valve clearances more often. You may think a thousandth one way or the other doesn't matter, but a thousandth can be like 4-6 degrees on the quietening ramps....ARH

I check my valves at every oil change just as a habit. I also pull and check the plug and go over my spokes and bolts, check the steering stem and a quick wheel bearing check via wheel wobble test. I call it a "maintenance day," and it is a good way to spend a couple of hours just making sure everything is good to go. At the rate I ride, it's usually once a month.

Originally Posted by culcune

Get hold of NZbrakelathes...he will sell you a valve tool set direct from China.

Yeah, it's not necessary, but it makes adjusting the valves a heck of a lot easier/quicker. It also comes with some extra gaskets and feeler gauges for a very reasonable price. Worth it in my book.