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NathanAR50
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Posted: Sun Oct 5th, 2008 04:17 pm |
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| Ive got a Kawasaki AR50 and seriously need help with it. Im 16 on the 13th of october and would like it running properly. I have equipped it with a micron exhaust thats all, the rest is standard. My test pilot (my dad) taken it out after installing the exhaust and found that it only achieved 20MPH!!! Ive checked everything i can think of and can hardly find a forum that helped. If there is anybody out there who can help i would be so gratefull. The other thing bothering me is that after installing the micron exhaust i found that i could not install the exhaust gasket as the exhaust would not fit right and smoked, so i have installed it without one is that how it should be ?
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Hooli
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Posted: Sun Oct 5th, 2008 05:23 pm |
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welcome to the forum.
those are two smokes arent they? so i know sod all about them. give us a clue for the smoker fans here though, hows it run? does it want to go & seem restricted? does it miss & splutter? etc etc
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jamie.s
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Posted: Sun Oct 5th, 2008 05:45 pm |
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NathanAR50 wrote: i could not install the exhaust gasket as the exhaust would not fit right and smoked, so i have installed it without one is that how it should be ?
Quite possible that you have a leak in the exhaust, two strokes NEED back pressure to run properly.
Has the carb been rejeted to suit the new exhaust ?
Did it go better with the old one ?
Whats the Air cleaner like?
Last edited on Sun Oct 5th, 2008 05:45 pm by jamie.s
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15 years old! Bikes: 1956 Ariel Colt TLR200 2X cb550s, D10 bantam trials, 2000 ER-500 Kwak
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north_wales_classic
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Posted: Sun Oct 5th, 2008 05:55 pm |
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| your AR will run like a bag of nails if you dont have a decent gasket seal around the zorst flange as jamie said a 2 stroke expansion chamber works on back pressure have a look at the gif below also if the pipe does not fit properly "is it the correct pipe for your bike" if it is the right one you may have to up your main jet a couple of sizes also are you running the standard air filter or a k&n or s&b etc etc, i'm not 100% sure but is the ar motor a reed valve one if so i would reccomend ditching the standard steel petals for fibre jobbies...
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supersix
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Posted: Sun Oct 5th, 2008 06:26 pm |
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| There is a honda CDI that wil pep it up a bit, but without drastic mods,they are always slow,45 ish. They do look nice and are generally reliable when sorted. There are a few 50/ped forums about, they may help a bit more!
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Frankfurt-Beesa
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Posted: Sun Oct 5th, 2008 06:36 pm |
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| I had an AR50 with a Micron and it went sweet as can be, deff'nitly needs re-jetting, as said above make sure the whole pipe is gas tight, leaks at the cylinder will kill performance. And make sure the carb is clean and the 2T-oil is getting through, and the float level is OK, the only trouble mine ever gave me was due to float level being too high and then the mixture became too rich.
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jamie.s
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Posted: Sun Oct 5th, 2008 07:19 pm |
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Frankfurt-Beesa wrote: I had an AR50 with a Micron and it went sweet as can be, deff'nitly needs re-jetting, as said above make sure the whole pipe is gas tight, leaks at the cylinder will kill performance. And make sure the carb is clean and the 2T-oil is getting through, and the float level is OK, the only trouble mine ever gave me was due to float level being too high and then the mixture became too rich.
How do you properly set the float hight, as I think this is why the TLR is running Rich.
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15 years old! Bikes: 1956 Ariel Colt TLR200 2X cb550s, D10 bantam trials, 2000 ER-500 Kwak
My bike in CBG magazine
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NathanAR50
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Posted: Sun Oct 5th, 2008 08:17 pm |
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| Thanks for the replies people. Im a trainee mechanic so ive got a basic understanding on two strokes but have never worked on one. Are they supposed to smoke alot? There is no leaks on the exhaust as i can see, yes it has a reed valve but it looks fine. Im gunna try and rejet the carb see how it seems then. Could any body give me step instructions on how to do it? Back to the speed problem it revs fine and gets to 4th gear and cant rev over 5k of revs so its only capable of 20MPH. Has anybody else had the same problem with a aftermarcket exhaust?
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north_wales_classic
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Posted: Sun Oct 5th, 2008 10:37 pm |
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NathanAR50 wrote: Thanks for the replies people. Im a trainee mechanic so ive got a basic understanding on two strokes but have never worked on one. Are they supposed to smoke alot? There is no leaks on the exhaust as i can see, yes it has a reed valve but it looks fine. Im gunna try and rejet the carb see how it seems then. Could any body give me step instructions on how to do it? Back to the speed problem it revs fine and gets to 4th gear and cant rev over 5k of revs so its only capable of 20MPH. Has anybody else had the same problem with a aftermarcket exhaust?
yes they all smoke a bit thats the beauty of a 2 stroke..." the smell and the blue haze" start worrying if theres no smoke. i doubt very much you have a good seal on the exhaust flange if you have no gasket fitted. as for rejettin the mains just whip off the float bowl usually 4 tiny philips screws and voila the main jet is staring at you normally brass you cant miss it, it will have a size stamped on the outer edge try one or two sizes up..........by the way how did the bike run with the standard exhaust fitted?
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NathanAR50
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Posted: Sun Oct 5th, 2008 11:39 pm |
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| I never tried the top speed on it but it ran fine with the standard exhaust but it was blowing on the front. Thanks for the help mate.
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Hooli
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Posted: Sun Oct 5th, 2008 11:44 pm |
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still got the normal zorst? i'll stick it back on as test to prove what the problem is. if you then KNOW its the micron causing it it cant be that hard to get suggested jets etc to run with the micron & you'll know your chasing the right fault.
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NathanAR50
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Posted: Sun Oct 5th, 2008 11:46 pm |
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| Yea im gunna try it next as i was leaving it as a last option as it is rusty as hell and may break.
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JimM
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Posted: Mon Oct 6th, 2008 01:45 pm |
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north_wales_classic wrote:
NathanAR50 wrote: Thanks for the replies people. Im a trainee mechanic so ive got a basic understanding on two strokes but have never worked on one. Are they supposed to smoke alot? There is no leaks on the exhaust as i can see, yes it has a reed valve but it looks fine. Im gunna try and rejet the carb see how it seems then. Could any body give me step instructions on how to do it? Back to the speed problem it revs fine and gets to 4th gear and cant rev over 5k of revs so its only capable of 20MPH. Has anybody else had the same problem with a aftermarcket exhaust?
yes they all smoke a bit thats the beauty of a 2 stroke..." the smell and the blue haze" start worrying if theres no smoke. i doubt very much you have a good seal on the exhaust flange if you have no gasket fitted. as for rejettin the mains just whip off the float bowl usually 4 tiny philips screws and voila the main jet is staring at you normally brass you cant miss it, it will have a size stamped on the outer edge try one or two sizes up..........by the way how did the bike run with the standard exhaust fitted?
Hi Nathan. I used to have an AR50 when I was 16. Two-strokes will smoke a little, but it's nothing to worry about because they're designed to burn their lubricating oil. It shouldn't smoke too much though – this will coke the motor up. You can adjust the amount of oil being used with the oil pump. An after market exhaust should not restrict the revs – if anything it should free it up and allow the motor to rev more. The standard UK AR50 barrel is heavily restricted in both its inlet and exhaust ports. The bike won't rev freely beyond 7000rpm in standard form. Have youchecked and cleaned the air filter? This could be the cause of your problems. It's also worth going up a size in main jet if you're going to fit a non standard exhaust, just so it doesn't run too lean. I used to go one grade cooler on the plug too. I hope this helps.
Jim
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triumph5ta
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Posted: Mon Oct 6th, 2008 03:40 pm |
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The boys on this forum will also help you:
http://www.sixteener-special.co.uk/
theres a few guys on there with AR50s, good luck.
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NathanAR50
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Posted: Mon Oct 6th, 2008 06:21 pm |
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| Thanks a lot for the info Jim.
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NathanAR50
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Posted: Mon Oct 6th, 2008 06:23 pm |
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| Could anybody tell me were abouts is the oil pump is on the AR50 and is it simple to setup ?
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JimM
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Posted: Wed Oct 8th, 2008 09:22 am |
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| Hi Nathan, the AR's oil pump is behind the triangulated cover at the front righthand side of the engine. If memory serves me correctly, they'rre cable operated and a sinch to do.
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Badgerman
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Posted: Fri Oct 10th, 2008 01:51 pm |
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If the Micron is pretty old (of course it will be!!), then check that its clear and not completely coked up inside. If it is blocked in any way then it will be restricting the flow and you will going knowhere fast....or slowly
Welcome to the time consuming world of two strokes......take my word for it, they might be frustrating as hell, but when they are working right you can't beat em!!
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Velton
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Posted: Fri Oct 10th, 2008 02:21 pm |
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My (boring) advice is to try to get it running properly with the standard exhaust, filters, carb settings etc.
Then start changing things if you want.
2 strokes are often slower/ less pleasant to ride when "tuned" anyway, but unless you're sure that all the basics are good then you will be setting yourself up to chase wild geese forever.
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