need help guys!

[Hunter]

Hey guys and girls! I need a bit of help, pleeeese reply cause my RK is lying naked on the garage floor screaming for help..

1) Is SAE 40 good enough for transmission oil? ambient temperature all year round is about 29 degrees centigrade here..!

2) If I want to replace piston rings and reeds do I have to replace any gaskets? Is there any sealant I could use with the old gaskets as gaskets are not available here in sunny sri lanka!

3) I have to replace the foam air filter with a new one cause the old one has a gaping hole in the center (bits were sucked in..!), any suggestions on replacement foam filters? Any special type of foam required or would normal foam do?

4) Any precautions when cleaning out a carb for the first time? Are there bits I shouldn't fiddle with too much?!

5) Ok.. thats it for the moment.. round two tommorow

Thanks for the effort.. really appreciate it!

Cheers

Hunter

[Guest]

Pleeese respond my bike needs to get out a bit..

[peabo]

Hey there!!

First of all NSRs are crap in comparison to Aprilia RSs!! heheh.. I know cause I own both...

1) SAE 40 (API SE etc.) is good enough.. you don't need multi-grade oils for NSR transmissions.

2) You can just use a sealant.. but its recommended to change gaskets.!

3) I suppose normal foam would do.. i've never really had to replace them before.. but don't really think its that important. Now that you know your bike worked without the air-filter why don't you just leave it like that!!!

4) don't fiddle with anything you don't know about.. just use compressed air to clean it thoroughly.


I suppose most people here don't know much about NSRs after all.. hahaha


P-BO

[G]

>>3) I suppose normal foam would do.. i've never really had to replace them before.. but don't really think its that important. Now that you know your bike worked without the air-filter why don't you just leave it like that!!! <<

Air filters are there for a reason. To stop shit getting into the engine.
AFAIK even dust particles can score the cylinder lining, if you're running a race bike that is regularly overhauled then it shouldn't be a problem, for the rest of us an air filter is reccomended. I would expect the carbs may also need adjusting as you're changing the rate of airflow.
It's best to get an air filter made for the NSR, if not, at least one made for motorbikes in general.


>>First of all NSRs are crap in comparison to Aprilia RSs!! heheh.. I know cause I own both...<<
Btw there is a 'fights & flame wars' section for that sorta thing

[Keen]

[craigT19]

i dont see it the rs has the top end trophy but from the rs's ive ridden the nsr out accelerats it to 60 and out handles it, i have never had an rs keep up with me on corners ive evan had a race through my local national park lol with a vfr400 and won the guy who was ridin it was evan nice enough to get in the first round
____________________
Bikes owned :- 2001 nsr125, 1999 zx6r, 2006 yzf-r1, 2009 xmax 250, 2012 yzf-r1, 2015 MT-07
Current bike : - 2016 MT-10
BCF member pops. sadly missed 1945-2003

[TiN]

[Korn]

[Dan]

he proberly owns two because his daddy and mummy bought them for him, think we r looking at a spolt brat

[Scooby]

I just think he's bullshitting. Nuff sed.
____________________
A big enough hammer fixes anything!

[Demonic69]

Bet he can ride them at the same time too.
And fly
And pull


WAKE UP!!!
____________________
Back on a Blade. Just feels so right.

[Hunter]

Heheh.. put it all down to experience I say!

Back to one of my questions! Does anyone know if gaskets are re-useable? can I do with using some sealant with the old gasket (if I were to take the head apart)?

Also, do I need to replace any gaskets when replacing reeds? I've got a set of boyesen reeds I'm dying to try out!!

Cheers

[Kickstart]

Hi

You should not really reuse gasket, and the chances are that you will not get the engine apart with damaging some of the gaskets to the extent where you really have to replace them. For those in low stress areas buy some gasket paper and use the old one as a template to cut out a new one. If you are careful you can probably dismantle the top end of the engine without undoing the cylinder head bolts and so not disturbing the cylinder head gasket

Gaskets work by being made out of a fairly soft cardboard. This cardboard compresses where is needs to, thus filling in any gaps. It doesnt compress twice!

All the best

Keith

[TiN]

Isn't it funny how all of the questions are actually being answered now?...welcome back Keith!...we've been padding out the topic posts in anticipation of your return...

Tin

[Kickstart]

Thanks, its just taken me about 5 hours to catch up on the posts on here!

All the best

Keith

[Hunter]

Keith mate!! I have a question!

I took the air box apart for an inspection (first time since I bought the bike) and found that a chunk of it has got swallowed into the carb and no doubt the combustion chamber and through the exaust.. hehe

I have noticed that the power was really down on the lower revs on my bike lately and thats why I decided to have a look at the air box.

1) Do I have to take the carb apart and clean it up thoroughly? When taking it apart would I have replace any o-rings?

2) Can I improvise a new piece of foam with anything else? I.e. do the ones for other bikes work too? In sri lanka you cannot find NSR specific stuff.

3) Can I change the reeds too while i'm at it.. without replacing any gaskets?

As you can probably tell I'm new to this bike servicing stuff!!

cheers for the help.. really appreciated!

Hunter

[Kickstart]

Hi

The carb has some O rings to seal it. These should be OK, but can tear and then the bike will likely run a bit oddly, but they should survive OK. They may have degraded with age though. Only one is likely to be a problem which seals the choke jet into the float bowl

I would be careful usin alternative foam. You have no idea how a particular piece of foam flows air. However, I think you can buy some foam for making filters from some of the aftermarket parts suppliers.

You can change the reeds fairly easily. Think there are a couple of gaskets, but these are not that stressed. If they do not tear you can probably reuse them, but otherwise buy some gasket paper an make another.

All the best

Keith

[Dylan]

Anyone know where you can get carbon fibre ones from???
Dyl

[Hunter]

You can get carbon fiber ones from boyesen (though MandP also I think)..
I'm doing an over-haul on my bike at the mo.. and will put these on.. will keep you posted!

Keith! Thanks for the replies!!

I just bought myself a compression tester.. is this a surefire way of testing the cylinder compression? How is the best way to test for compression using it? Any suggestions would be greatly appreciated!!

Is servicing the transmission a tough job? can you do it all without special tools (i.e. any flywheel pullers needed?) I have got the usual set of tools (spanners, wrenches, allen keys and feelers), no torque wrench though
What does usually go wrong with the transmission on NSRs? Mine feels a bit 'sticky' and the return spring ain't too good I think!


Cheers!

[Kickstart]

Hi

Compression tester is nto much use on its own, but may be some use if you use it regularly and keep a record of the results. Normally best on a larger engine where you look for a difference between cylinders.

Some parts such as the clutch should be fairly easy to get at, but anything inside the engine crankcases (not the outer clutch casing) is going to need lots of effort.

First thing to try is to oil / grease any external linkages on the gearchange (not applicable on the NSR), change the gearbox oil and adjust and oil the chain (makes more difference than you would think).

All the best

Keith

[Hunter]

Cheers Keith!!

My problem is that I cannot find head gaskets in Sri Lanka.!

I would have liked to take the head apart though, because I want to check the condition of the piston/head.

I have imported a piston (with rings) from MandP, its a brand called 'JCC' (taiwanese), any ideas on the quality of these pistons? Should I replace it with the Taiwanese one if I take the head apart? My bike is a NSR 125RK with 16000KM on it..!

Also, have you heard of Silicon gasket makers? Are they any good as gasket replacements, can they be used together with old gaskets which are in good shape (for low pressure areas such as reeds)?

Too many questions I know.. I'm still learning!!

Cheers!

[Kickstart]

Hi

On the head gasket you cannot really get away with a 2nd hand gasket. Base gasket maybe, but not the head.

Silicon gasket sealant will work, but after that you certainly wont be able to reuse the gasket. On the lower stressed areas use grease on new gaskets.

It should be possible to buy sheets of gasket paper which you can cut to size, but this is no use for the head gasket.

No idea how good that make of piston is. I had lots of bad experiences with non OE pistons years ago (they rarely lasted long enough for the bike to be run in) so these days I tend to stick to original ones

All the best

Keith

[Hunter]

Keith! More questions!

I took the carb apart and have taken all the jets, pilot screw, and throttle stop screws off.

How does the float level affect the performance of the bike?

Also, I noticed that the strainer screen that was supposed to be present at the fuel inlet was actually not there! Does this cause an issue? I suppose I should be able to find one tommorow... wonder why anybody would take this off.. anything performance related?

What does the pilot screw do exactly? I have heard from some that this should be 2 turns from some people and 2.5 turns from some others! Was wondering what difference this makes!

Okay thats it for now ! Cheers!

[Hunter]

Oh and one more thing, what is the best possible way to clean the entire carb.. I have access to a compressor but can't for the life of me figure out how these little jets and holes can be blown by the 1/2 inch tube that comes out of it!! Wouldn't they fly off!! How about using a compressed air can? would the pressure be enough?

Thanks again!!

[Kickstart]

Hi

Float height has some effect, but I would be dubious about playing with it. Most likely effect is you will land up with it flooding the engine when parked!

Use a compressor and airline, with a "gun" like attachment. Cheap and easy to get in the UK, and very commen. Also get a can of carb cleaner. Avoid using anything metal to poke through the jets.

My guess is the screen got blocked so someone removed it........doubt they were the sharpest tool in the box. Without it any cack in the fuel will get into the carb, possibly blocking a jet or causing the needle valve to stick (once again flooding the bike when parked)

The idle mixture screw only affects running at small throttle openings (normally up to around 1/4 throttle). It should be 2.5 turns out (except for Swiss market bikes).

All thebest

Keith