tzr 50 loosing power

[dj-999]

hi guys

I need some help with my tzr 50. It starts fine and performs brill on a straight but even the smallest of inclines on the road cause massive power loss. The bike will not accelerate but just boggs down. I have tried everything from checking carb, changed plug, air filter, carb settings even exhaust. I have ran outa ideas hope someone can help

thanks

[Dischord]

Inclines and even wind often cause 50's to slow down dramatically. They simply don't have the power, my Senda wouldn't even rev out against wind.

Your only option is to change the gearing. Go a tooth down on the front and a couple of teeth up on the rear sprockets. Expect to loose some top end though.

If you're sure it's a mechanical problem try a new piston+rings, they could be worn. I would do them every 5000 or so miles on a 50 tokeep it runnign nicely.

Also if you have a high revving performance exhaust that wont help things as you will lose lots of torque.
____________________
2012 KTM EXC 250

Check out my vids - https://www.youtube.com/user/KTMSparky/videos

[zenith10]

my sr50 can go up hills easily even steep hills can be tackled at 35-40

[Groove]

[Johnny GSX-R]

It will run out of puff, you can use a Land Rover windscreen washer motor as a turbo for a bit of oomph.

[Johnny GSX-R]

Also consider using a RED 'power band' too in conjunction with an 'Iridium' spark plug.

[TheDonUK]

[dj-999]

what do you mean by red and orange power bands????

[TheDonUK]

You dont know?

Power bands are performance upgrades for your bike, they come in different colours, and depending on the colour you choose, boost power by upto %120 of what your bike makes as standard.
So if you install a RED power band on your 50cc, it will just about break the tonne... An orange one will double the torque and give you more useable power for town riding... but watch out, it will want to wheelie in every gear now, you will have the benefit of being able to burn off 600cc Sports bikes... Litre bikes will still have the legs on you though... just, only passing you when you top out at around 100....

A GREEN powerband is to be avoided... its for Cruisers and supermoto style bikes...

But i warn you, installing a power band on your 50cc will make it a beast to ride, you will have to watch out not to highside, and dont give it the beans from a standing start or you may well find yourself lying on your back...

Hope that helped, if not go to your nearest mechanic/dealer and ask them to explain the difference between a RED "power band" and a ORANGE "power band"... and make sure they know you are serious about purchasing one, and not just a time waster...

[dj-999]

another prob

my tzr 50 will idle fine when cold but when warms up the idle wont drop below 2500rpm. I thought that the cable might be sticking but if i turn off and back on again without touching throttle it idles perfect at 1600rpm, but as soon i take the revs past 2500rpm it will stay there till i turn off again. NEED HELP RAN OUTA IDEAS

could someone give me carb settings?

also when riding the temp light comes on what could be the reason for that????

having alot of trouble with my bike HELP!!!!

THANKS

[fast_tzr]

Sounds like you may need to adjust the idle screw, I had the same problem with the temp light, replaced the thermostat and it was sorted.

[dj-999]

can you suggest the carb settings

[fast_tzr]

Well what main jet is in there at the moment? Chances are its already jetted fine for stock de-restricted.

[dj-999]

i was told that it was stock and not de-restricted but it reaches 46mph on the straight, so having doupts. as far as i know the jetts are standard

[fast_tzr]

In that case its de-restricted(though possibly not fully). At what rpm is 46mph, I assume thats in 6th?

[dj-999]

about 8000rpm and in 6th. It has the standard exhaust system still tho and looses pulling power on inclines

[fast_tzr]

The exhaust may still be slightly restricted then, mine pulls to 10500 but its a spanish model so slightly different cylinder etc. yours should pull to at least 10k though, can you afford a sports exhaust?

[dj-999]

yes i could get an exhaust but at the moment i would like to get working first. ha. where is the thermostat? would the needle in the carb need adjusted

[fast_tzr]

I only mentioned the pipe as if its still slightly restricted that could be where your problem lies, though I can't say for sure. Thermostat I have no idea, dealer sorted that and they told me that was what they replaced(though considering this was in Spain the translation may be wrong anyway). I wouldn't piss around with the jetting for the moment, do a plug chop, meaning find a straight road, and hold the beast wide open for around 20 seconds, then hit the kill switch(don't go down through the gears) and coast to a stop at the side of the road(layby would be good though). Take the plug out and look at the colour of the electrode, it should be a coffee colour if the jetting optimum, white or white speckles indicates lean, black or darker brown equals rich. The needle is only for the mixture at part throttle, personally I think the bike is still partly restricted, do the plug chop first though and see what you find

[Dischord]

The thermostat is plugged into the cylinder head, should have a thick black hose coming from it.

The needle can be adjusted for running richer or leaner. If you want to go richer move the clip to the bottom notch so it allows more fuel. reverse for leaner running.

Don't forget the powerbands, I reckon a nice red one will work well
____________________
2012 KTM EXC 250

Check out my vids - https://www.youtube.com/user/KTMSparky/videos

[Timmeh]