Another quick NSR question!

[jonnay]

Alright people,
I need to use my NSR every day, about 30 miles a day if I just use it for essential trips. When I get home from college there's about an hour of daylight left, so I can get maybe one job done on it a night.

If I was to put my derestricted exhaust on the bike tonight, and then upjet it tomorrow afternoon, would I do any serious damage to it? It'd do about 30 miles before I got the new jets in it. I think it'd be alright, but if 30 miles is enough to sieze it, I'll have to wait until the weekend when I've got a whole day to see what I'm doing.

Thanks in advance,
Jon
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[NSR Mick]

I'd advise doing it all at once, but if doing one at a time do the jetting 1st.

Or work quickly

[NSR-Rulez]

i dont think it will take that long to do the exhaust restriction, the longest one will be the airbox plate, if you havent done that yet then just up jet it when you do.

NSR-Rulez
____________________
Past: 1985 Suzuki GS 125 + 2002 Honda NSR 125 R-2 + Ford Fusion
Present: Honda CBR 600 RR-5 + Suzuki SV650S-K4 + Mitsubishi FTO GPX

[fuzz]

You don't need to upjet. I rode my NSR for 6000 miles without upjetting, so I don't think 30 will make any difference. Alain swears that upjetting is neccessary, but I never had a single engine problem. I've only just upjetted, and for no other reason than to see if it will pull any better in top at 8000rpm+ yet to be tested!
____________________
https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800

[jonnay]

No problems yet... the airbox was already done, and the exhaust is now, too. Thing seems to be running RICH rather than lean Checked my sparkplug, and it was very black... if they run lean they're more white... right?

Cheers,
Jon
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[fuzz]

If it's black, it might have too much oil in it. If it's carbon black, then yes, it is too rich.
____________________
https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800

[jonnay]

It's oily black, it hasn't been cleaned for AGES though. It had been getting harder and harder to start for a few weeks, until eventually it wouldn't go at all until I took it out and gave it a wipe. I've now replaced the plug
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[fuzz]

Just keep monitoring it. If it goes oily again check your oil delivery system.
____________________
https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800

[alains]

i said you need upjetting if you de-restrict your bike
____________________
the worst day fishing is better than the best day working

[jonnay]

Right, this is wierd...

The bike is now fully derestricted (but not yet upjetted), but it still only manages about 75mph on the flat It used to do about 60-65. It also accelarates a LOT harder than it used to.

Surely 75 isn't right? Will upjetting give me any more speed? It's UK spec, too, so there shouldn't be any other restrictions lurking apart from the undersized sprocket (which wouldn't be that restrictive, surely?)

Cheers,
Jon
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[alains]

i suggest you look your max RPM in 4th ,5th and 6th gear , then tell me which size are your sprockets
____________________
the worst day fishing is better than the best day working

[jonnay]

11,000 in 4th, about 10,000 in 5th, and 8,000 in 6th I don't know why it won't rev higher in the top gears, it's just flat... can't really use 6th on a straight road only downhill. Sprockets are standard size.
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[Chiz]

Thats exactly what mine is like and its completely standard- does about 75, maybe 80 with a long enough straight. It'll get to 75 in fifth alright but change into 6th and its only just in the powerband so even a small incline and i have to change down. I'm taking all the restrictions and upjetting this weekend hopefully, i'll let you know what happens.

[andrew]

I'll probably get moaned at for this but when i had my NSR i never bothered rejetting it after fitting an Arrows system. The mixture was probably out but it didn't seem to do the bike any harm, in fact i did about 10k on it without any problems so i'd say you'd be fine with 30 miles.

What i wouldn't do is change the air fiter without jetting. Zimma, a lad who used to come on here changed his and within 10 miles the thing seized up.

[jonnay]

Ohhh, why is it sooo slow? It's fully derezzed and I get about 80 on the flat. There must be something else holding it back, but what??

Damn thing..

Jon
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[alains]

your compression , rings or piston
____________________
the worst day fishing is better than the best day working

[jonnay]

doh You really think that they're on the way out? That's going to be expensive, isn't it....
____________________
::'04 Yamaha Jog:: || ::'01 Honda NSR:: || ::'00 Suzuki Swift:: || ::'89 Swift GTi:: || ::'96 Swift Poverty Spec:: || ::'92 Swift GTi::

[jimpuntoy]

my nsr is deristricted in the exhaust dont know about the plates blocking the air flow its a 1990ish model standard sprockets, does 4th in the red 5th redline 6th just over 10,000rpm at 140kmph is this normal??

[Blunet600]

my nsr is restricted still. it does 80 pretty quick once the revs kick in. but i do have the same problem with 6th. my bike is the 02 model. and i will rejet once i derestrict jsut to be safe of any problems as i havent enough money to risk the pistons, or rings or anything screwing up.