ZXR250C timing?

**Juniper** · 8th January 2014, 15:08

Does anyone know intimately the ZXR250C 1994?

I had it all apart yesterday and its misfiring (among many thing) and the guy I was with said its to do with the timing.

Now it was set up when we opened her up as 1234 which is/should be wrong. His 1990 and the internets say it should be 1342 or 1243.
Now 1243 didn't really work, no misfire as such but absolutely no power and loud clunk noises happened.
The internets (plural as took the majority vote from many websites) say 1342 but the cables don't look like they go that way. The lead for the 2 is just too short and 3 is a slight stretch, and when we just managed to do it it wouldn't turn over.

Personally I think we are dealing with a mirrored dyslexic mechanic who put it together, because even though the plugs sat at 1234 the leads they are attached to came out the order of 4231.

Halp?

Strong possibility is that my bike may be a ZXR250C on the outside and frame but the motor and girly bits are something different.

**nzspokes** · 8th January 2014, 19:56

What does the workshop manual say it should be? The clunk will be your pistons having the life hammered out of them due to incorrect firing order.

I would suggest following the workshop manual to the letter. If you don't have one, get one before you blow the motor.

If you blow the motor make sure you get it on video.

**frogfeaturesFZR** · 8th January 2014, 20:07

1243 with #1 being the left most cylinder, as you sit on it
Or so Google says anyway
Good luck

**ducatilover** · 8th January 2014, 21:06

It runs a waste spark system, one coil supplies cyls 1-4 and the other coil cyls 2-3
The LHS coil (from memory) is for cylinders 1 and 4

What exactly have you done to the bike?

**Akzle** · 9th January 2014, 05:41

disconnect every shit. Take the valve cover off.
Turn the engine over by hand.
Watch.
Majikally, youre firing order will become apparent.

**Akzle** · 9th January 2014, 05:47

Originally Posted by ducatilover

It runs a waste spark system, one coil supplies cyls 1-4 and the other coil cyls 2-3
The LHS coil (from memory) is for cylinders 1 and 4

What exactly have you done to the bike?

LEFT. thats assuming no cunt has swapped the trigger leads over. And on the olden raped fuckery that is this 250... Wouldnt count on it. And i have a sneaky suspicion even the hts dont give any clues.

And i second a haynes/shop manual.

And why did you destroy it??

**Juniper** · 9th January 2014, 07:20

Originally Posted by nzspokes

What does the workshop manual say it should be? The clunk will be your pistons having the life hammered out of them due to incorrect firing order.

I would suggest following the workshop manual to the letter. If you don't have one, get one before you blow the motor.

If you blow the motor make sure you get it on video.

Originally Posted by Akzle

LEFT. thats assuming no cunt has swapped the trigger leads over. And on the olden raped fuckery that is this 250... Wouldnt count on it. And i have a sneaky suspicion even the hts dont give any clues.

And i second a haynes/shop manual.

And why did you destroy it??

Cylinder numbering method: 1234, firing order 1243

What's the numbering method? cause none of the holes or leads they come from are in the left to right order of 1234. (this is called learning!)
The only manual I've managed to find is for the ZXR250-C6 not sure what the 6 is about. and the picture shows pipes on both sides. The manual doesn't mention a year in it at all.

I didn't destroy it. I've been told I need new carbs so I found a set of second hand ones on trademe. Contacted the guy and he's said that as I've paid 2 groups of people and still no change that if he can't fix it I don't pay anything. And if he does its $400 including his carbs or $250 without no matter how much time he spends on it.

I figured it was a good deal, especially when we worked on it for 8hr. He took it for the test ride and wasn't happy with it so didn't want payment.
He's a good bloke so is doing some research at his end, because he likes fixing bikes and is intrigued by mine (as he used to have the 1990 version) and I'm doing my own research my end by asking you guys.

As long as my bike doesn't come back worse I'm happy to let him at it and he teaches me at the same time.

There is a very strong possibility that it has been used as a track bike at some point in its past.

**nzspokes** · 9th January 2014, 07:51

Ring Alec from here, http://www.smebike.com/about_us

He will rebuild your carbs properly. He will know whats wrong with them once they are apart. he is one of the best carb guys ive come across. Dont use carbs from a different bike. Hes a motorcycle engineer so can make parts if needed.

**Akzle** · 9th January 2014, 07:55

Originally Posted by Juniper

Cylinder numbering method: 1234, firing order 1243

What's the numbering method?

is from front of motor to back, as viewed in a line.
Ie, front (chain side) is one, next 2, 3 and otherside is 4.
Firing order just means those numbered cyls fire in that order.

**Juniper** · 9th January 2014, 08:04

Originally Posted by nzspokes

Ring Alec from here, http://www.smebike.com/about_us

He will rebuild your carbs properly. He will know whats wrong with them once they are apart. he is one of the best carb guys ive come across. Dont use carbs from a different bike. Hes a motorcycle engineer so can make parts if needed.

Making will possibly be an option because you cant get new parts apparently.

Does he charge the earth? Might be a venture for when I have a job.

//Warning child winge //
Its really hard to know who to trust with your bikes because everyone says that the other person is the best at this or that. "Spectrum are good" "George is the best"
//end winge//

**Akzle** · 9th January 2014, 08:08

Originally Posted by Juniper

cause none of the holes or leads they come from are in the left to right order of 1234. (this is called learning!)

as duc said, you have 2 coil packs, each with 2 leads out, one will feed cyl 1,3, t'other cyl 2,4.
(and leads, plugs, shoulda been numbered before removing) firing order is determined by magneto pickup, so as long as the feed/trigger INTO the coils havent been swapped, shit should happen on time.
Hope carbs were balanced and jetted right. No amount of spark will help if they fuckered.

~edit~
actilly. Crank degrees should be same between all. So... Shouldnt matter if input swapped....?

**Juniper** · 9th January 2014, 08:26

Originally Posted by Akzle

as duc said, you have 2 coil packs, each with 2 leads out, one will feed cyl 1,3, t'other cyl 2,4.
(and leads, plugs, shoulda been numbered before removing) firing order is determined by magneto pickup, so as long as the feed/trigger INTO the coils havent been swapped, shit should happen on time.
Hope carbs were balanced and jetted right. No amount of spark will help if they fuckered.

~edit~
actilly. Crank degrees should be same between all. So... Shouldnt matter if input swapped....?

We didn't end up taking the carbs out because found that the vacuum tubes were cracked and not sealed so hoped that would work, the rest of the day was spent on the timing. so balancing and jetting were last done by George.

Ahh yes coil packs is the name I was looking for. Yes the numbers that came out of them were 32 and 41 (left to right)

**nzspokes** · 9th January 2014, 08:42

Originally Posted by Juniper

Making will possibly be an option because you cant get new parts apparently.

Does he charge the earth? Might be a venture for when I have a job.

//Warning child winge //
Its really hard to know who to trust with your bikes because everyone says that the other person is the best at this or that. "Spectrum are good" "George is the best"
//end winge//

Well he is the real deal and you will see race bikes there not just commuters. he doesnt work for free but he gets it right.

For jets from Honda that were $90 each he had them for $7. And needles from kawasaki that were no longer made he had new ones for $18.