Question about 2005 AJP PR4 125 Enduro

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I have a PR4 125 Enduro and the top speed is 82.6

Why can I only get to 40 mph in fifth gear?

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The guy I bought it from took great care of this bike for five years but only rode it 577 miles in that time period. If I let it sit for longer than an hour I have to use the choke to get it kickstarted. I let it idle around 1800 - 2200 rpms is that too high?The carb on a bike that old surely needs cleaned. There are two small jets in it one with a very small hole, just buy a new one. Thats idling way too fast, about 1,000 rpm is right.,,,

Posted on Nov 10, 2008

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I have a hawk 250cc Chinese dirt bike with 80mph on the speedometer but I only can get it to 50mph what could I do to get it to 80mph


Speedometers always go a lot higher than the maximum speed of the bike. In the case of your Hawk 250 the quoted top speed is 74.5 mph. In my experience of riding trail bikes and competitive enduro, you will only reach it under ideal conditions. That is usually a following wind, downhill, with a light rider, riding one handed with your head on the tank. NOTE - This isn't a very safe way to ride! The main problem with dirt bikes is the riding position which is sitting high up like a flag in the wind which causes extreme wind resistance which will easily know 20 mph off your top speed.

your bike also needs to be correctly set up, and I doubt that Chinese engineering workmanship is that good. at 80 mph things can go bad very quickly.

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The speed shown on the speedometer is not accurate on my Yamaha XT125R - -When travelling at 30MPH -The speedo shows 38MPH -When travelling at 40MPH -The speedo shows 52MPH -When travelling at 50MPH - The...


If the speedo gear is in the front wheel a different wheel would have different gear and mess up the speedo but I'm thinking the gear wouldn't mesh with the old speedo cable teeth.Check a shop manual for stock number of teeth on rear sprocket and tranny sprocket,that will tell the story.While your at it check the stock wheel size compared with what you got.Of course it could be bad speedo.There's springs in there that run needle, so?Maybe borrow one and try it out.Good luck.

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My 2005 Kawasaki Vulcan 750 is struggling in fifth gear, and intermittently tachs high at speeds over 55mph.


If the bike is reving high in top gear but you are not gaining speed or very little speed your clutch is slipping. This is a sign the clutch needs replaced.

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Your best bet is to go up one or two teeth on the front sprocket. This will increase the top end speed. Swapping gears is not likely to help and would be problematic.

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On two seperate occassions, my 1988 HD FXRS seemed to lose power suddenly on the freeway - It went from 70 mph to 15 mph without shifting down from fifth. I attempted shifting through all gears but nothing...


The latter part sounds like insufficient play on the clutch lever--the clutch seems to be slipping. Sudden power loss is usually linked to the ignition system. Have you checked the lube level in the transmission? You could be having a bearing seizure if the lube is low.

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Stick shift # Automatic RPM


That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

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Fifth gear lock-out


You should have fifth gear. There is no fifth gear lock out. Most likely it's not going into fifth gear, due to play in the shifter, or play in the linkages.

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