Technical Talk for GK76A GSX-R 400

[Arcfire]

Originally posted by IceZ@May 6 2004, 08:23 PM

Hey...juz wanna known can Rs250 rims fix on the G4?coz my frd did tat n it juz perfect.

Ehhh...y would you wanna do that?

[ktkt]

Originally posted by ZZR-Pilot@May 6 2004, 06:43 PM

Anybody got info on the following (for GK76A):

 

1) Valve clearance - check interval

2) Valve clearance - values for intake & exhaust valves

3) Camchain & tensioner - replacement interval

4) Fork oil - capacity

I think you can get your answer from 400greybike.co.uk or the newly setup

http://www.gsxr400.co.uk

 

I remembered reading the info from there or somewhere on the net....

[ktkt]

Originally posted by IceZ@May 6 2004, 08:23 PM

Hey...juz wanna known can Rs250 rims fix on the G4?coz my frd did tat n it juz perfect.

Got money anything can do.

 

Like you always say "Money is not a problem, Problem is no money!"

[IceZ]

Coz heard tat it were be much lighter.lighter=faster

[Guest slow-turtle]

Originally posted by ktkt@May 6 2004, 11:07 AM

Most likely a jetting issue. A bike that starts well when cold and not when it's warm has it's jetting off.

jetting = tuning???

 

please advice...

[Guest slow-turtle]

Originally posted by josean@May 6 2004, 02:23 PM

i think its normal

mine has the same syntoms also.

 

when the bike is heated up, the starting tends to be weaker compared to when its totally cold.

 

even when i went to wash and set my carbs properly from guan ho, i still need to pull choke in the morning when its totally cold. how do u explain that then ?

Thanks for your feedback...

[josean]

Originally posted by IceZ@May 6 2004, 11:46 PM

Coz heard tat it were be much lighter.lighter=faster

lighter = faster.

but...

lighter = not durable

lighter = less stable too

lighter = the object u use to light up ur ciggie

 

 

 

if nth wrong .. best is dun change lah

thats why i think lor.

 

may fit perfectly but how abt the wheel bearings? the brake disc assy ?

[speedtriple]

like to find out if G4 cannot start after not riding for a week izzit because the battery is weak? what is this attributed to if riding it frequently does not give problems?

[ktkt]

Originally posted by slow-turtle@May 6 2004, 11:57 PM

jetting = tuning???

 

please advice...

The idling portion is determined by a few factors.

Consider that the jetting is the same for this bike which is issued worldwide

and expected to work in all kind of climates. I believe there's some marginal

safety by jetting it a bit rich.

 

Anyway, the pilot circuit determines how the bike idle.

So without changing the pilot jet, the only adjustment you can make

is adjusting the fuel mixture screw which controls how much air/fuel mixture

tat feeds the engine which is a great feature for the bike.

 

In conjunction, carb sync of the carb and the idling screw will affect it as well

or rather mask a improperly jetted bike.

 

A bike that requires a choke to start when cold is a good sign that

it is properly jetted.

 

As for Guan Hoe doing a good job, they sync the carb when the bike was cold

and screwed up the fuel mixture screw setting(too rich) and in the end,

I ended doing the whole thing again when I brought the bike home. But

the old man was meticulous in his workmanship but perhaps caught him on a

lousy day....

 

Anyway, might be your carb is dirty. I wouldn't say that JB petrol causes it but rather the rust in the fuel tank which ends up in the carb and cloggin the jets.

[ktkt]

Originally posted by speedtriple@May 7 2004, 12:37 AM

like to find out if G4 cannot start after not riding for a week izzit because the battery is weak? what is this attributed to if riding it frequently does not give problems?

Hard to say. Weak battery is when you start hearing the starter motor

getting weaker and weaker until it doesn't crank up anymore. I remembered

that time when tealeaf helped me pushed start the bike when I was at his place.

Prior to that, I could hear the starter motor cranking weakly. Anyway, bought a new battery and it was back to normal. Noticed that the date on the old battery

was like almost close to 2 years.

 

Is that what you experienced?

Or are you experiencing difficulty in starting the bike after a cold spell in the rain

and u can just flat out deflate the battery just holding on to the e-start button?

[Guest ZZR-Pilot]

Originally posted by ktkt@May 7 2004, 12:49 PM

Noticed that the date on the old battery

was like almost close to 2 years.

My Yuasa MF batt is nearly 3 years old and still going strong! Early next year I'll toss it away lah, regardless. Don't want to wait until I have to push-start the bike before changing it.

 

I guess if you ride daily, your battery lasts longer.

[Arcfire]

Originally posted by speedtriple@May 7 2004, 12:37 AM

like to find out if G4 cannot start after not riding for a week izzit because the battery is weak? what is this attributed to if riding it frequently does not give problems?

Could haf something to do wif the lack of fuel in your carbs since you left it there for so long wifour starting it....i tink primeing it and then trying to start it after a while might work.......

 

Had dis problem once after parking at my carpark for 2 days wifout starting it.... Unless your bike has tell tale signs of a weak battery, otherwise it shouldn't be a battery problem. Alternatively you can check your battery using the voltmeter .....

[ktkt]

Originally posted by ZZR-Pilot@May 7 2004, 01:02 PM

My Yuasa MF batt is nearly 3 years old and still going strong! Early next year I'll toss it away lah, regardless. Don't want to wait until I have to push-start the bike before changing it.

 

I guess if you ride daily, your battery lasts longer.

I read from the Yusa website that even with proper maint, the battery will start giving problem like in 1 1/2 years time. (and that's with slow trickle full charge

every month)

 

Remembered that lots of start/stop will prevent the battery from being fully charged and hence they recommend a slow trickle full charge every month.

Something to do with crystallization. Nonetheless, the info there is well, very informative. Maybe u guys wanna check it out.

 

http://www.yuasabatteries.com/literature.asp

[Guest slow-turtle]

Originally posted by ktkt@May 7 2004, 12:42 PM

The idling portion is determined by a few factors.

Consider that the jetting is the same for this bike which is issued worldwide

and expected to work in all kind of climates. I believe there's some marginal

safety by jetting it a bit rich.

 

Anyway, the pilot circuit determines how the bike idle.

So without changing the pilot jet, the only adjustment you can make

is adjusting the fuel mixture screw which controls how much air/fuel mixture

tat feeds the engine which is a great feature for the bike.

 

In conjunction, carb sync of the carb and the idling screw will affect it as well

or rather mask a improperly jetted bike.

 

A bike that requires a choke to start when cold is a good sign that

it is properly jetted.

 

As for Guan Hoe doing a good job, they sync the carb when the bike was cold

and screwed up the fuel mixture screw setting(too rich) and in the end,

I ended doing the whole thing again when I brought the bike home. But

the old man was meticulous in his workmanship but perhaps caught him on a

lousy day....

 

Anyway, might be your carb is dirty. I wouldn't say that JB petrol causes it but rather the rust in the fuel tank which ends up in the carb and cloggin the jets.

Thanks...

[speedtriple]

Originally posted by ktkt@May 7 2004, 12:49 PM

Hard to say. Weak battery is when you start hearing the starter motor

getting weaker and weaker until it doesn't crank up anymore. I remembered

that time when tealeaf helped me pushed start the bike when I was at his place.

Prior to that, I could hear the starter motor cranking weakly. Anyway, bought a new battery and it was back to normal. Noticed that the date on the old battery

was like almost close to 2 years.

 

Is that what you experienced?

Or are you experiencing difficulty in starting the bike after a cold spell in the rain

and u can just flat out deflate the battery just holding on to the e-start button?

Hey kt,

I experienced it when i did not start it for a few days. Had to push start. Choke don't seem to make a diff!

 

Anyway, blowing the throttle to prevent the engine to not die off is not a good practice rite? Expecially a cold start.

 

How much did it cost you to replace the batt? Where did u go change it?

 

Which is the idling screw and which is the air/fuel mixture screw?

[speedtriple]

Originally posted by Arcfire@May 7 2004, 01:15 PM

Could haf something to do wif the lack of fuel in your carbs since you left it there for so long wifour starting it....i tink primeing it and then trying to start it after a while might work.......

 

Had dis problem once after parking at my carpark for 2 days wifout starting it.... Unless your bike has tell tale signs of a weak battery, otherwise it shouldn't be a battery problem. Alternatively you can check your battery using the voltmeter .....

What's primeing it? How do you do that?

[ktkt]

Originally posted by slow-turtle@May 7 2004, 06:51 PM

Thanks...

Yo. Nice to meet you yesterday at KKFC.

[ktkt]

Originally posted by speedtriple@May 8 2004, 01:30 AM

Hey kt,

I experienced it when i did not start it for a few days. Had to push start. Choke don't seem to make a diff!

 

Anyway, blowing the throttle to prevent the engine to not die off is not a good practice rite? Expecially a cold start.

 

How much did it cost you to replace the batt? Where did u go change it?

 

Which is the idling screw and which is the air/fuel mixture screw?

I think yours might be a jetting issue cause your idling is very irratic.

The "choke" should work if your pilot circuitry is set properly.

 

I guess why you're blowing the throttle after push starting the bike is to

prevent it from dying again rite? And sometimes when you open the

throttle it dies again rite? Gotta tikum tikum if not gotta push start

again?

 

Anyway, the battery you can buy from the basement of Sim Lim Tower.

It's a YTX 9BS. I bought mine from LAB cos tat day that shop close.

Can remember how much liao. 40 or 50 plus.

 

Idling screw is at below the carb at the middle. Used for adjusting

the idling(It actually opens the butterfly so in effect it's like opening and maintaining your throttle)

 

The mixture screw is also at the bottom of the each carb in the intake manifold

direction.

 

Anyway, you might wanna give GH a miss this time round and look for another

bike shop if your're not going to DIY. Heard that KS in Ubi is good.

[ktkt]

Originally posted by speedtriple@May 8 2004, 01:31 AM

What's primeing it? How do you do that?

Actually, the priming option on the fuel c*** doesn't do anything one I realise...

[Guest slow-turtle]

Originally posted by ktkt@May 8 2004, 01:11 PM

Yo. Nice to meet you yesterday at KKFC.

:cheeky:

[Arcfire]

Originally posted by ktkt@May 8 2004, 01:35 PM

Actually, the priming option on the fuel c*** doesn't do anything one I realise...

issit? haha.....tot it was to fill your carb wif petrol when your bike has not been ridden for some time after which your carb has not petrol left inside it??

[Guest ZZR-Pilot]

Originally posted by ktkt@May 7 2004, 01:22 PM

I read from the Yusa website that even with proper maint, the battery will start giving problem like in 1 1/2 years time.

Scare owners into changing batts often. I'd say the same if I wanted to sell more batteries.

[FieryGiX]

Setting the fuel cork to PRI will prime your carb and fill your float bowl with petrol from the tank. Otherwise, Gsx-R work on vaccum to suck in petrol from the fuel tank.

 

Today I discovered another common problem

------------------------------------------------------

Clicking Front brake Disc

 

Today, I look into my caliper and realised that in my right caliper, the pistons are not protruding evenly. The left pistons are protruding more than the right pistons. resulting in my brake disc been pushed against the right. Overtime, this effect will cause your disc to come off their dowels and you get a loose disc.

 

Hence, next time when you change brake pads. Look into ur calipers and make sure your calipers piston are more or less the same. Could save your brake disc some day.

 

Benefit after adjustment are better braking feeling and "even" brake pads usage.

[ktkt]

Originally posted by ZZR-Pilot@May 10 2004, 07:30 PM

Scare owners into changing batts often. I'd say the same if I wanted to sell more batteries.

True true.... But what the article says does make sense.

Longevitywise, i think that's a guideline on normal usage.

Dunno whether frequency of usage has anything to do with lifespan?

[ktkt]

Originally posted by Ae86@May 10 2004, 08:24 PM

Setting the fuel cork to PRI will prime your carb and fill your float bowl with petrol from the tank. Otherwise, Gsx-R work on vaccum to suck in petrol from the fuel tank.

 

Today I discovered another common problem

------------------------------------------------------

Clicking Front brake Disc

 

Today, I look into my caliper and realised that in my right caliper, the pistons are not protruding evenly. The left pistons are protruding more than the right pistons. resulting in my brake disc been pushed against the right. Overtime, this effect will cause your disc to come off their dowels and you get a loose disc.

 

Hence, next time when you change brake pads. Look into ur calipers and make sure your calipers piston are more or less the same. Could save your brake disc some day.

 

Benefit after adjustment are better braking feeling and "even" brake pads usage.

I dun think the pri function is really useful.

I took out the fuel tank and switch it to PRI and no fuel comes out.

taking out the fuel c***, and dismantling it, the PRI position does nothing at all.

6 oclock on position is the normal fuel inlet, 9o'clock is the reserve inlet and

3 oclock PRI just goes back to the reserve inlet again perhaps more like between

the reserve and normal fuel inlet(can't recall) It still operates by vacuumn.

 

So i think it might serve to allow more fuel to fill the carb bowl when you take out the carb and use it to help fill the carb bowl when u assemble it back.

 

then again, I dun think the petrol will dissipate from the carb bowl from sitting

there for one week???