Somethin is wrong...

[JaZ]

since i de-restricted, ive been lovin the bike, but lately it seems to be lacking somewhat. less power, less speed, less accelaration. less f*ckin everything.
now i know that my bike was a hell of a lot more difficult to de-restrict than any of u guys. welded in about a million places where it shouldnt be etc..
it still only goes 60 in 6th gear. 90 in 5th.
i dont know what running lean means, but i hear because of my de-restrict it may be doin so.
any ideas? any mechanically minded people in my areA that might be able to tell if they rode it?
Cheers guys
JaZ

[Richard]

what area?
l8r
zimma

[JaZ]

i live in stafford.
i can go as far as utox, shrewsbury, brum or... er what'd be north.
JaZ

[C Samsgard]

Check the cylinter head,. and turn upp your oil-pump a littel bit.
Is it taking in air?
How many miles has it gone?

[JaZ]

where do i turn up the oil pump? and r u sure i wanna do this? i mean it eats 2-stroke oil as it is.
not the most economical bike to run really are they!
JaZ

[C Samsgard]

then you dont do it, maybe thats the problem.
Its "dust" in the exhust-system.
How do you drive it?

[JaZ]

Like i stole it.

[Tony]

I was told by the mechanic in Gary Rothwells Shop that there is a posability they can run lean. If you think its doing this my advice to you would be to get it seen to straight away as Fredo said he's seen a few with blown engines after having this problem.

[milo]

how many miles have you done sinse the spark plug was last changed? should be changed every 2.5k miles (ish)

[Keith]

Hi
JaZ, I live in Stafford so drop me a note on <A HREF="mailto:100662.3423@compuserve.com">100662.3423@compuserve.com</A> and we will meet up and I will have a look. I will have to check if I am insured to ride someone elses bike though.
A lean mixture means that there is not enough fuel for the air, and rich mixture means there is too much fuel for the air. The mixture should be (about) 14.7 parts air to one part fuel, by wieght. A SLIGHTLY richer mixture gives best power, and SLIGHTLY leaner mixture gives best emmisions. Run too rich and the plug will get coked up and the bike will not give good power. Run too lean and the engine will run hotter, give less power and stand a chance of seizing or burning a hole in the piston.
As Milo mentioned, how old is the plug? To check the mixture (roughly) you can do a plug chop. Find a steep hill (one from Weston on the A518 is probably a good one) and hold the bike on full throttle at high revs up it. When ready, pull the clutch and hit the kill switch at the same time. When you get to a halt take out the plug and have a look. It should be a nice biscuit brown colour, too dark and it is rich, too light and it is lean.
Also, how many miles has it done? It may be worth thinking about new rings if it is around 10,000. Maybe worth running a compression check on it, but only if someone else can confirm a healthy reading to compare it with.
It is almost certainly a good idea to clean out the air filter. The air filter should be lightly oiled, but that means only a tiny amount and it will work fairly well with no oil on it.
However, it seems stange that the bike runs quite well in 5th, but then looses power badly in 6th.
All the best
Keith

[Chris]

I'm watchin this with interest cos i'm gonna derestrict my bike asap, and i wonder if im gonna have to adjust the mixture too. Mines an X-reg '00 model, whats yours Jaz? I'm not about to start messin with carbs and all that shit.

[JaZ]

ill e-meither u in a bit. cheers
chris. mines a Y reg 2000 model.
what dealer did u get urs from.
i advise u skip back a few pages and find a post by me thats entitled "URGENT HELP NEEDED! DE-RESTRICTING ATM."
or something along those lines. see my exhaust was welded where it shouldnt be, and isnt on any other model of NSR. how does ur bike run in 6th gear btw? can u get it above 6k revs? i couldnt when mine was restricted...
and i still cant now! if i cane it up to 9k, drop her into 6th.. the revs just die to their comfortable 6k. how LAME!
Keith.. is ur NSR yellow and black?
grrr.
JaZ

[Chris]

I got mine from Sittingbourne service station dealers with a mate of mine getting a bike from there at the same time.When they derestricted his they had to send of for parts????? Dunno what parts were needed though.
Mine does seem to lose acceleration in top,though I can see 75-80 (restricted) on a downhill section of dual carriageway near me at about 8000rpm.Does this sound familiar? I fu**ing hope not cos urs sounds like a bitch to derestrict!

[Keith]

JaZ
Currently I dont have an NSR, just too many years of running 2 strokes.
Is your powervalve working? Just wondering. It may be that when you change up into top gear the revs are falling down into the range where the valve should be closed. It may also be worth lowering the gearing slightly, but unless the gearing is REALLY high I would still expect it to pull through from low revs in top gear. The only bike we had that wouldnt was a Cagiva Freccia, and that had been ported (power started at 9500, red line at 10000, power ended at 11000).
Looking through what you said last time, how did you remove the restrictor plate without moving the carb? That plate is between the carb and the engine.
Maybe, as your exhaust was put together by someone with a welding fettish there may be another restriction with the bike (such as something to stop the throttle opening fully).
By the way, I have an NSR workshop manual.
All the best
Keith

[JaZ]

Chris. if u can get it up to 8k in 6th then dont worry. mine physically would not break the powerband.
this powervalve thing? oh sod it theres no point in discribing here, ill not uinderstand
are you busy all weekend keith? id love to let you have a go and see whats up... ill drop u an e-meither anyhow.
L8rz
JaZ

[Keith]

Hi
I am going to be around a fair bit this weekend. Have to sort out the back brake on the Bandit (one of the most stupid pieces of design I have seen for ages).
Does the power valve go "whirrr - whirrr" when you turn on the ignition, or does it just go "whirr" once? If it doesnt do it at all, or does it once then it may be sticking open. This way you will have very little low down power, a noticable power step when it comes on pipe and then normal full power. Cagivas can wreck the power valve control unit so that they open the valve but not close it. Reset the valve, turn on the ignition and it opens but doesnt close again. The Cagiva power valve control unit is Japanese made, and may be shared with or similar to the NSR.
Mind you, real silly system was the KMX125. You can apparently put it together so the valve is open at low revs and closed at high revs, resulting in little power anywhere!
All the best
Keith

[JaZ]

how can i hear the powervalve when im starting up the engine?! i hear a something when i turn it off, but only sometimes. and sometimes when i start, but not all the time.
i definitely need to adjust my air/fuel mix, seein as its taking in a lot more air... that should sort the sluggishness out... but as for the tom foolery on my top gear... who knows!?
JaZ

[Keith]

Hi
You should hear the whir when you turn on the ignition rather than when you start the engine.
All the best
Keith

[JaZ]

No then, i dont get any whirr when i turn on the ignition....
JaZ

[Hibby]

If your power valve is not working check for a electrical restrictor, this will be a red and white wire link in the black box under the tank. Also check for a orange and white link in the junction box under the back fairing this limits low revs.
Hibby

[JaZ]

the orange and white, thats the cdi yes?
the other one in my airbox??!
what should i so? just disconnect them?
and if my powervalve is sticking, what should i do bout it?
JaZ

[JaZ]

ok, the thing that turns when u start up, well, it turn once when i press ignition, then when i give some start the engine it turn again, but it does look at times as tho its tryin to move (makes a pathetic whimper of a whirrr) but turns about 1 mm.
ive put my air/fuel at 3. will go out for a spark test in a minute.
couldnt find a red - thite connection in the wirin box under tank.
couldnt find orange - white under rear faring. theres a few suspect connections tho.. hidden down the side. dunno tho.
im gonna full her up with premium, get some shit hot 2stroke, warm her up for half hour at least, then see if theres any difference.
im worried bout this powervalve tho, its poorly.
but the bike runs, and i get power at 8k. sluggish till then tho.
thx for all the advice peeps =)
JaZ

[JaZ]

since i adjusted the fuel mixture the other day my bike has A. started making funny pppffffffftsch type sounds when i turn it on occasionally.
and B. cuts out at traffic lights(real embarrasing) or basically when its idling.
i ddidnt play with the big screw on the carb, just the little one on the right.
any ideas? should i adjust the idle(that big one aint it?) to compensate.
JaZ