Hawk tune up, top speed, and general musings. - Page 4

OneLeggedRider · 05-28-2019, 04:05 PM

Well it's coming up on 600 miles so I figured I was past the break in tune up time. The valves and chain were loose, and oil change was long overdue, and the muffler was rubbing the tire at full suspension compression.

The muffler was simple, just a trip to the hardware store for a longer bolt and 5 washers. The 520 O-ring chain had stretched alot, I was actually concerned about riding it lastnight. But 2 turns on each adjustment screw fixed that. The oil was remarkably clean, I figured it would have a gray color, and there wasn't any metal in the screen. So I'm real happy about that.

I had set the valves at .005" for the break in and I figured they'd be tighter now but they were actually looser. I set them to .003" and hopefully won't have to worry them for a while. I also added 1 washer to the carb needle for a total of 3, but haven't test ridden it yet. One of the intake nuts fell down into the sprocket cover so I had to pull the shifter and cover off to retrieve it.

Yesterday I checked the top speed with GPS and the stock speedometer is way off. In the heat of the day it ran 58mph and 63mph in the cool night air. Also I'm impressed with the brakes. I popped over a hill on an unfamiliar paved road and had about 30 feet to turn right or left, so I locked up the rear wheel momentarily and grabbed a handful of front brake! There might be a small hole in the seat from my sphincter tightening up..

05-28-2019, 04:05 PM	#1
OneLeggedRider Join Date: Nov 2018 Location: Stockport, Oh. Posts: 1,442	Hawk tune up, top speed, and general musings. Well it's coming up on 600 miles so I figured I was past the break in tune up time. The valves and chain were loose, and oil change was long overdue, and the muffler was rubbing the tire at full suspension compression. The muffler was simple, just a trip to the hardware store for a longer bolt and 5 washers. The 520 O-ring chain had stretched alot, I was actually concerned about riding it lastnight. But 2 turns on each adjustment screw fixed that. The oil was remarkably clean, I figured it would have a gray color, and there wasn't any metal in the screen. So I'm real happy about that. I had set the valves at .005" for the break in and I figured they'd be tighter now but they were actually looser. I set them to .003" and hopefully won't have to worry them for a while. I also added 1 washer to the carb needle for a total of 3, but haven't test ridden it yet. One of the intake nuts fell down into the sprocket cover so I had to pull the shifter and cover off to retrieve it. Yesterday I checked the top speed with GPS and the stock speedometer is way off. In the heat of the day it ran 58mph and 63mph in the cool night air. Also I'm impressed with the brakes. I popped over a hill on an unfamiliar paved road and had about 30 feet to turn right or left, so I locked up the rear wheel momentarily and grabbed a handful of front brake! There might be a small hole in the seat from my sphincter tightening up.. Last edited by OneLeggedRider; 10-30-2019 at 01:58 AM.
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