My gps says I did 238 mph as my max. However I understand that the top speed is in the 105 mph range, since a cx will go 11 mph per 1000 rpm in top gear.
Really? I guess its because of the gearing. I'm sure with different gearing I'm guessing they could probably hit 120 before wind resistance is too much for the rider/bike.
really only 109?? when i first got the bike it had a 120 speedo and i had it up to 115 (it was fun) now will i do it again nope......and also that was on flat land also with no wind so i dont know unless the speedo was off.....
I've never had a bike with an accurate speedometer. They seem to all read fast. My current speedometer reads about 5 mph fast at 65 mph. I usually ride with a GPS and just use that speedometer. If you have the correct front tire the odometer of a gear driven speedometer can be very accurate. My odometer matches my GPS.
I've never had a bike with an accurate speedometer. They seem to all read fast. My current speedometer reads about 5 mph fast at 65 mph. I usually ride with a GPS and just use that speedometer. If you have the correct front tire the odometer of a gear driven speedometer can be very accurate. My odometer matches my GPS.
All speedometers are over and under at certain speeds. As for mechanical speedometers being correct well what's mechanical?
Sure a gear spins at the wheel and connects to a cable. But when it goes into the back of the speedometer that cable turns a turns a gear and a magnet. The gear goes to the odometer/tripmeter and the magnet pulls the needle into the right position but without resistance it is off. So to do that there is a spring inside. Over time springs lose tension and inaccuracy happens. Now we have another fail rate.
I can tell you that I test all my speedometers with a drill and set them to 64mph which is the speed the drill will turn them. Anything above or below is off.
I have one that's dead on at 64mph but at 30mph it thinks it's going 20. And that's not good.
The original owner of my CX got pulled doing 115 mph when it was fairly new. He had it just below the redline. When the trooper asked what he was doing he said "riding fast." Luckily for him he knew the guy, especially considering that was in the 55 days.
FYI, one of the fellows in our group at Bonneville ran a stock appearing GL500 in Production Pushrod class. This bike has a 650 primary drive, mated to a 500 trans, 12.3:1 CP pistons, Webcam grind, GL650 valves, and Kemph ported heads. It also has the headers split and the inner tubing removed, then rewelded, plus a set of GL650 carbs. Density altitude on our time slips showed around 6000-7000 FT, and the rider weighs about 285. The bike would pull 11,000 RPM in the lower gears, but couldn't pull 5th gear.
The bike finally went 97mph on the salt....pretty good for the air density and rider weight! It is seriously hampered, for top speed, by the long intake and exhaust tuned lengths....it just WON'T come "on the cam" like my other engines do. We will try the bike with my carbs/manifolds and my exhaust lengths to see what happens at El Mirage (pretty similar air density, compared to Bonneville). I'll let you know if it works better.
I'd be really interested to know how the magazines at the time measured the speed, as they all universally wrote that the CX topped out in 5th at 105 to 109. I have one article that says the cx custom made it to 106 in 1/2 mile. These articles were all for the 500's, I don't remember what the 650's top speeds were but I know they were about 2 seconds quicker to any speed.
A 1983 Cycle Giude article I found on-line at: http://www.motorcyclespecs.co.za/model/Honda/honda_gl650_83.htm gives the GL650 a calculated top speed of 120MPH. It's clear they came up with their top speed by using the rear tire diameter, gear ratio and maximum allowable engine RPM.
Same bike here, 80 mph seemed like the reasonable top end for safety. By coincidence? or for legal considerations, the owners manual for the 81 GL500I states "never ride an accessory equipped motorcycle at speeds over 80mph". With the rate of acceleration at that speed and the amount of throttle left, its unlikely this faired GL500I would reach 100mph.
one of these days i am going to get some twisties on film for you guys the posted limit is 25 i zip along around 35 to 40 mph on them hehehe steep cliffs no guard rail all the time......alot of wrecks and a lot of hair pin turns and switch backs......
I regularly used to wring out my CXs...back in 81 I tried keeping up with my dad and his BMW R100RT for 4 days on a trip into Canada. That little twin was a pretty good soldier!
I still like to go fast....this makes it pretty easy.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Honda CX 500 Forum
613K posts
34.8K members
Since 2010
A forum community dedicated to Honda CX 500 motorcycle owners and enthusiasts. Come join the discussion about modifications, parts, classifieds, troubleshooting, maintenance, and more!