okay got the NSR back together over the weekend.
First run with new setup. i went rather rich on the mains to avoid any engine damage.

previously all stock, except the daytona filter in the airbox and carbon reeds. I rode the bike last year, and it felt very good. Reved fast and clean and i knew i had to own it..

now ive added tyga pipes and increased the mains from 130 to 147.5
cleaned the carbs, fixed my 2T oil seal leak, bled the pump etc..
put the bike all back together

bike fired right up with 4 kicks, (not bad for sitting all winter)

i did not touch the slow jets or the air screw.

bike ran pretty good sitting... might be pulsing a little bit too much, but not sure as this is my first NSR. Bike didnt rev quite as fast as i expected, but not that slow either.. When i let off the throttle, the bike slows down slower then i expected as well...


i had the tunning guides from this site, and tried to do some of that.
I turned up the idle (the knob next to the frame on the left, please let me know if im an idiot and this is not the idle screw) to try to get the 4k, but could only get it to go to about 3700..
folowing the tuning tips, i couldnt really get the bike to hold at 7k either
it seemed too sensitive, it would either shoot way past or stay below; after about 8 tries, i was able to get it to stay around 7k.. i had to go past, and then slwoly let it come down to 7k to do it.

all in all just seemed a bit rich to me, so i went for a 5 minute ride
(not registered or insured yet, so i didnt do any plug readings or anything)
Since it seem rich, and i wasnt worreid about a seizure. The bike had a stumble around 4 -5ish.. but then it came out of it
and would rev up (still slower then i would expect) and then right around 8k when im expecting a hit of power, it just kinda breaks all up and stuff
if you hold it there you can force it to slowly rev higher, but it is not really making any power, and deffinatly wouldn't rev to redline.

Soo... im thinking way to rich... drop down to a 140 main and test again?
i never touched the floats or anythign else in the carbs, so its unlikely i messed anything up.. but ya never know..

ill get the bike all legit this week so i can do some plug readings and more road testing soon...

Any suggestions appreciated
_________________
Koren
2 Strokes and I'm Off

mine ran the same when i was running rich,i ran mine for about 10 miles and it killed the top plug so i had to ride it home as a 125,so it does sound like your running rich.

speaking of the top running richer...
do most of you jet that carb one main smaller?
or what do you do to try and compensate.

is dropping to 140 too much of a jump for me?
should i go 145 or 142ish first?

Thanks

(starting to think people run pods just so they dont have to pull the airbox each time they work on the carbs)
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Koren
2 Strokes and I'm Off

apart from the pipes you have not done any other mods since running on 130's,so 140 might be a good place to start but there are many more people than me who know more about jetting.I done the airbox mod and my stock endcans have been shortened and the packing inside removed and im back using 128's(stock).


Last edited by nsr.wayne on Mon May 02, 2005 8:27 pm; edited 1 time in total

I've just done the airbox, I have shortened end cans with packing removed, when the HRC stuffers arrive I'll be starting at 132, and thinking 130 might be right. I'm a newbie too though!

Chris

Caveat Tuner....

Even with tyga pipes on mine i ended running 124 main jets with an air box and that bike never once gave me any trouble. Thats 2 sizes down from stock. Wayne also ended up close to that although i sent him some 130's plus just to be on the safe. Its better to start off way to rich than way to lean.. as our piston thread shows... NB tyga 300 i just cant get jets big enough to stop them seizing lol
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If I have to take the carbs off once more...

threw in the 140's about 830 last night
did the tests again, was able to hold at 7k much eaiser
bike still was pulsing a lot i thought.

went for a ride, and way better! still not revvin as fast as i expect
but no longer coughing at 8K and will pull redline now.

went for a quick zip and realized that my low beam is so dim its not useful
so i need a new bulb there
and you can only the bottom and top of my tach and speedo are iluminated
so some lights must be out inside that too? any part numbers or tips would be good

went about a mile away, turned around and came back; as i started slowing down to pull into my driveway, the bike died
i think both plugs were fouled but have not had time to pull them yet

still too rich.. gonna get a 134 and a 132 (already have a 130)
and start working down from 134 next week
_________________
Koren
2 Strokes and I'm Off

Well got a chance to work on the bike again last night
i opened the shed and phew.. gas smell and a big wet spot under my bike
my tank had drained down to the reserve.
I figured my floats had stuck or something and proceeded to work on the beast.

As of my last session the bike died, and i thought it had fouled both plugs so i decided to go leaner
the next smallest jets i had were 130's (last run at 140's)
so i pulled the tank airbox, carbs etc.. (im getting really fast at it heh)
and put in the 130's

I then went to change my plugs
as i figured the bike died from fouling..
They looked light tan.. lean enough to be concerned i thought...

so then im all confused as to how a bike can go from 145 mains and not even pulling redline to dangerously lean at 140...

i go to put my tank back on and i notice there is a tear in the gas line
So the reason the bike died is cause it stopped getting fuel..
SOOOO im thinking the plugs look so lean cause the bike stopped getting fuel...?

so i clean up the plugs on a wire wheel, carb clean them and throw em back in the bike and go for a quick zip at the 130 mains since they are already in..

Checked the plugs and they were darker tan then At 140.. I only rode for a few miles cause i was scared that it might be too lean.

Not sure where to start now on my next attempt.. throw the 140's back in and start working down or maybe go buy some more jets.. 134 132 ish range...

Also i noticed that my plugs are BR9ES This is not the BR9ECM plugs that are in the specification section. How much difference does this make? Is all of my tunning a waste with these plugs? these plugs are like 2 bucks each VS the BR9ECM's that are like 15 bucks each!!! id much rather buy 6 or 8 of the BR9ES plugs to tune the bike and then just throw in the good ones when im there if possible.. PLEASE ADVISE me pros / cons ??
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Koren
2 Strokes and I'm Off

wow its been 2 months since i really worked on my bike..
about a month back i went for a run, and it kept dying on me...
i had recently put in an inline fuel filter, but i knew that wasnt the cause..
seems my float bowls were damp and not sealing properly
so my bike would end up starving for fuel after a few miles i think..?
if i sat for 30 seconds, the bike would start right up and then got a mile or so and do the same thing.

Question # 1:
is there a Replacement part for the rubber float bowl seals???
or just use some hondabond under them to raise them up a bit?


So last night i throw in the Denso W27EMRC spark plugs and also change the mains to 132.5, i tightened up the float bowls pretty good, so they are only oozing a little fuel, but not too much..

went for a quick zip and sure enough the bike dies in half a mile.. grrr..
oh wait, i am almost out of gas, flip to reserve go for a few miles with no problems.... nice.... lets ring her out a bit braaaaaaaaa braaaaa
long uphill i get her up to around 150kph. I'm pumped, i might actually get to start riding this thing!!! so i ride for a few miles, do a loop around a small lake nearby etc.. bout a 10 min ride or so.

So im thinking hmm i need a real test, im gonna ride her to work today
23 miles i think.. the bike fires right up this morning, on choke.
let it run like that for about 1 minute, then half choke for 1 min then no choke, while im getting my helmet gloves on etc..
right as i pull my gloves on the bike starts dieing like a flooded 2 stroke does, so i run to the throttle and start blipping it for all im worth, and it almost came out of it, but then died..

arggggggggggggghhh...
so now im running late for work and have to take one of my cars..

So question # 2 : is it normal for NSR's to foul plugs at idle?
should i not warm up the beast while sitting, and just jump on and ride nice for the first few minutes?

i really am starting to wish i bought that nice ZX9 i saw a few weeks ago
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Koren
2 Strokes and I'm Off

That's the joy of two strokes sometimes.Awesome when they work, but a pain in the butt when they don't.

I think you really need to sort out that fuel leak. It's possible you'll pull air in there too, and that's won't be good I'm sure.

I've run the wrong plugs in mine for years whilst racing, and it always seemed fine. Got loads of stick at the NSR meet, mostly from people whose bikes didn't run...

You should let the bike warm up before riding it, as the various bits of metal in the engine all expand at slightly different rates, and the bore will wear premature;y if you hammer it from cold.

If the jetting is close, the bike shouldn't foul at idle, but remeber that the mains aren't doing anything at tickover - it's the pilot jets and mixture screw that is providing the fuel. If the mid and top end feel good, then the main jets are probably close. Now you need to work on the part throttle settings.

You didn't think it'd be easy did you?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

got to work on the NSR again on sunday
sorted the float bowl dribble with some hondabond underneath the rubber seals. Went out for a ride that actually went about 8 minutes and no problems, then suddenly the bike dies...
sit a few minutes, check my fuel etc.. then fires right up.. so i keep goin, 5 mins later accelerating up a hill dies again at 70mph or so... after a few mins of sitting fires right up and i go over to my friends house to rant about my bike..

after discussing all the things ive tried, we come to the conclusion that the only consistent thing could be the bike starving for fuel, and suddenly it dawns on me. I go out to the bike and open the tank and hear a big woosh sound... Never noticed B4 as my helmet was on, traffic buzzing by etc..

so i leave the tank open and go for a 20 minute ride with no problems!!
The tank vent was plugged
UNBELIEVEABLE!!!!

get back to my house, investigate how the tank vent works, then spray some car cleaner into the rubber vent line just inside the gas cap, go get my bicycle pump and pressureize the line... about 120 psi she let go and purged the line..

no wonder jetting was getting me nowhere
bike would die going slow, going fast, accelerating, idling
runs rich, but plugs look lean...

after about 4-5 minutes it would die do to the vacume in the tank equaling the vacume from the carbs... no wonder i coudlnt make sense of all the various conditions that would cause the bike to die..

WHOOOO HOOOOO
maybe now when i try to jet the bike i will actually be able to make progress!!!
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Koren
2 Strokes and I'm Off

Keeps you out of trouble!

Maybe now you can start having some fun!!
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Andy.
NSR-WORLD.COM

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