hi everyone. im new here and also a new nsr owner. i have a kymco nsr 150. for those of you who are wondering what is a kymco nsr you can check it here http://en.wikipedia.org/wiki/Honda_NSR150 .anyways its been a great ride so far. but im having a few minor problems and would also like to do a bit of work to the bike when time and money allows. so im hoping i can get some help and advice here. for starters what kind of oil are you running? and what kind of transmission oil are you using? also when i start the bike from a cold start the rpms run around 4000 for a good few minutes before they settle down to between 1 and 2 thousand. is that normal? and when i pull up to a red light i will idle around 4000 as well for anywhere between a few seconds to a few minutes before the idle settles down. im guessing its something to do with the RC valve cause the rpms will drop once the little round thing with the two cables attached to it on the side of the engine moves (im guessing that controls the RC valve...please excuse my lack of technical expertise and vocabulary). anyways any help would be appreciated. nice to meet you.
sorry also forgot to add that the carb has been swapped with one from japan off a MC21 supposedly. i am not sure since i got the bike like this. if anyone can tell me how to tell which carb i have on it that would be great. thanks. here is a picture of my bike. its not much of a looker but its alot of fun to ride
1. oil, two stroke oil?? if u still running on oil pump you can use motul 510, agip speed castrol tts silkolene pro 2 etc....
2. transmission oil, can use the motul or repsol transmission, or use the 4 stroke engine oil
3.are you sure the carb is clean? the jetting is properly right? what sparkplug are you using?what is the color of the spark plug? I suspect that's due to dirty carb or wrong size of pilot jet. I don't know with the kymco, but the stock carb for nsr 150 is PE26 and PE28 for nsr 150SP.
I don't think the idle problem correlate with the rc valve but make sure the rc valve mechanism is right. on L position in low RPM and H in High position, by default it should full open (H) at round 7000RPM, but you can tune them as you want....
Hi, what part of Taiwan are you in? I used to live there and I had a Kymco NSR. It's actually a Japanese design - Honda made the first NSR150s in Taiwan, in partnership with Kymco, then Kymco took over the production after the first year. As such, the first generation Japanese engines are quite sought after in NSR circles.
Anyway.
It shouldn't be doing the idle thing like that. Mine would do that sometimes before I got it sorted out, it was a carb issue if I remember correctly. My powervalve didn't work and was permanently open.
puck: 1.do you mean oil pump as in i am pouring the 2stroke oil into a little opening underneath the seat at the moment? im guessing that little oil tank leads to the oil pump that you are talking about. sorry if the question sounds retarded. im new to two strokes. should i be doing something that would be better like mixing it into my gas tank? right now im using Mobil 2stroke oil
2. so if i just use regular 4stroke oil the same as i would use to do an oil change on a 4 stroke for my transmission oil. that would be fine?
3. the carb should be clean as i had it cleaned by a shop when i first got the bike. and had a new spark plug put in. however for those who have been to taiwan know that doesnt necessarily mean too much. although the shop i go to usually does good work. but thats why i want to start working on the bike myself so i know whats actually going on. however i think something is wrong with the RC since it seems to be in the H position almost all of the time.
skinnybwoy: im in taichung. i think i may have a similar problem with the rc valve. it seems to be always in the open position. except as i mentioned after idling at a red light for about a minute before the valve (round thing right by the exhaust port) moves and then the rpm's drop. by the way do you know of any good shops in taiwan that specialize in nsr stuff?
I'm not an expert on NSR150's but I think the RC valve movement at a high idle sounds like the NSR250 "high" position check, for setting the valve position. Therefore, not something to worry about. This feature allows you to find the high setting position of the RC valve servo-motor, without having to take the engine to full revs whilst sat in the garage in neutral.
I think the idle, (tickover), speed of the engine just needs a slight adjustment. This is usually by turning a screw on the carb, or by turning a thumbwheel attached by a cable on the MC21 NSR250.
If you back the idle speed down a little at a time, you should find that eventually the problem will will be cured.
By the way, the idle adjustment screw will affect the carburettor slide rest position.
There is another screw on the carb which affects the idle mixture strength. The pilot air bleed screw. This is normally situated at the back of the carb, usually it is screwed in fully until it lightly seats, then backed off usually 1.5 to 2 turns out. You need to make sure that you adjust the right screw.
Happily, you shouldn't be able to do any damage to the engine by adjusting either screw incorrectly, just cause inconvenience mainly.
If you are not sure about what to do, ask someone experienced to show you how. Or take it to a shop.
Forgot to add that using the oil pump sytem is the best way for your road bike.
Mixing the fuel in the tank is mainly just for racing bikes these days.
The oil pump system is much more practical and less fuss than messing about mixing oil at the petrol station. Also it's safer for the engine too if you have little knowledge of the mechanical operation of the engine.
There is no need to add extra oil to the petrol in the tank when there is an oil pump system fitted to the engine.
I used to live in Kaohsiung so I only know of the NSR specialist there. However, I have heard that there is a specialist nSR mechanic in Taichung. Go to this forum, in the Cars and Motorcycles section and ask about NSR mechanics in Taichung, I guarantee someone will be able to help you out. There are also a few Taiwan model NSR150 specialists on the forum. www.forumosa.com
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