[SOLVED]Engine break-in....stalling...overheating?

Hope these purchases put the nail in the problem...

KL18-4380-1
Mikuni Large Round Main Jet #120
Sku:
4 $1.74





KL18-4381-1
Mikuni Large Round Main Jet #122.5
Sku:
4 $1.74





KL18-4382-1
Mikuni Large Round Main Jet #125
Sku:
4 $1.74





DYDC1-1
Dyna Dual Output 3.0 Ohm Coils (pair) DC1-1
1 $130.00





DYDW200
Dyna Ignition Wires - 7mm copper core (black)
Sku:
1 $17.00





DYCT-1
Dyna Spark Plug Wire Crimping Tool
Sku:
1 $12.00





07401-0010000
Carb Float Level Gauge
Sku:
1 $42.24





KL11-4972
Carb Holders (5) Vacuum plugs
1 $12.00


Grand total of 280$ with shipping... god i'm in love with the current state of the US Currency...

CAD > USD helps me save some money

So if after bigger jets (pilots (already have) and mains), new coils, wires and a complete bypass of the vacuum operated petcock (gonna use PRIME for ON and ON for OFF) and plug the carb #2 vacuum port.

ELCouz wrote: Coincidentally this looks like the same problem from last year!

kzrider.com/forum/2-engine/384186-very-v...roblem-with-my-kz750

I'm thinking throwing the Mikuni BS34 carbs through the windows... i'm sure it's fuel related...everything else has been rebuilt (engine side) and valve lash more than triple checked! Carbs has been rebuilt and vacuum synced too more than twice!

What country are you in? A lot ofthe gasoline in the USA has so much alcohol in it these days that the plugs don't color up like they used to with the same jetting.

Lift the needle 2 clip positions if it's adjustable. If not, shim it 2mm richer with tiny washers.

The main jet isn't the main problem here and I doubt like hell it's the plug wires or coils failing that's causing the stalling. Very doubtful on that deal.

You're dead lean on the needle for sure. Might like a larger main jet but the needle is way out in left field for correct mixture calibration...fatten that thing up.

What country are you in? A lot ofthe gasoline in the USA has so much alcohol in it these days that the plugs don't color up like they used to with the same jetting.

Canada... i'm using premium fuel 91 AKI or 94 RON (which don't have ethanol like regular fuel)

Lift the needle 2 clip positions if it's adjustable. If not, shim it 2mm richer with tiny washers.

Yes it is adjustable (canadian version) but i'm already a the 2nd position from bottom .. time for bigger main jets

I think I'm lean on the low cruise .. idle is ok (after 4 turns out [too much i think]) but if I'm too lean on cruise engine might overheat and upset idle mixture right?

Currently IIRC, i'm running on #117.5 main jets and #40 pilots ... i will try with 120 main and 42.5 pilots

If my memory serve me correctly, pilot jet are for cruise and idle...

Obviously not running on stock pipes :lol: but no pods :sick:



BTW larry, why don't you move out of USA and go here in Canada ... we need more KZ expert up in here :laugh:
Also we have snow its good for you i promise

A friend of a friend (take that lightly) told me that my carbs are still dirty... I've clean every passages I've found even double checked the needles (changed) and diaphragms (holes , cracks and stickyness)... cleaned choke passage too... new pilot jets and main jets...

everything was left soaked in carb cleaner then cleaned with elbow grease...

Maybe the float level is a little bit to low and i have more fuel and when the bowl get to 80C (idle , stops and red lights) it's overflowing or vaporizing fuel too much easily and the idle mixture is upset thus making too rich and wanted to stall...

Maybe I'm deadly wrong I'm just trying to understand a little bit more on carburetors theory.

have a nice day guys,
laurent

Carb theory you say....

Carb Theory

and another
www.iwt.com.au/mikunicarb.htm

Thanks guys already read that but I'm trying to understand my problem... by what I'm seeing in this forum, nobody have been through a problem that deep!

I mean in what i see in this forum everything is an easy fix or have a solution at least... for my case i think i doesn't fit in either one

start over, u must be systematic, u may (and probably do) have more than one problem,
u r over heating WHY ???? figure that one out first, I've seen (and experienced) fuel flow problems due to overheating, gas CAN boil, where is ur fuel line in relation to the motor ???/ do not run over 4000 rpm on break in PERIOD
NOW ONCE U FIGURE THAT OUT GO TO THE NEXT PROBLEM,
there are those here in the know, respect their knowledge

are those here in the know, respect their knowledge

By no mean i had any intention to be disrespectful to anyone on this forum...

Even I've been very active lately on the forum to help newcomers and stuff I've been through



When i joined the forum 2 years ago, I've promised to be helpful and i think it's kind of disrespectful to say that... especially when I've been there and spent full days (when possible) to help and give opinions when asked. Isn't that the base of a forum ?

regards,
laurent

I didnt say u were,
ease up, relax, chill
it was just a comment to the knowledge that CAN be found, not any sort of attack
it does seem u only noticed that part of my post though

do u do resumes ???? :laugh: :laugh:

it was just a comment to the knowledge that CAN be found, not any sort of attack
it does seem u only noticed that part of my post though

I've read your post (and thanks!) but sometimes brain does focus on the wrong part of the reply

For the break-in part, i'm not saying that it's wrong to go easy (did that in the past... manufacturer recommendation blablabla)...but this time i just want to try if those guys are right...

www.mototuneusa.com/break_in_secrets.htm

www.ntnoa.org/enginebreakin.htm

www.dansmc.com/engine_breakin.htm

If they were wrong.. bleh! new pistons rings and hone or sleeves... :pinch:

For the fuel part, fuel hose is as short as possible, no up and down and can't be different than OEM hose routing (only one way is possible).

After further readings (still looking for the Holy bible book of carbs...no no no not WiredGeorge...btw he should write a book about carbs. He's very talented )...

Probabilities are increasing that I'm running too lean on LOAD (did few rpm spin (neutral) with colortune and the results were very good)... possible low fuel level or bad jets (pilots or main...or even bad needle clip position)

I'm waiting for the orders from z1 to come...(will be late because of 4th july) the tool for measure float height will be very useful! So we can be REALLY done on that side

regards,
laurent