• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

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LC430 porting

oldbikedude

oldbikedude

Husqvarna
Pro Class
Hello, I have searched this site & haven,t found much on porting a LC430. Mine is an 88' & I would appreciate any info, personal experience, or reference on porting them. Dementions, tips and tricks etc...I had a 87' that was crazy fast compaired to the 88' I have. I had literally the same carb,reeds, pipe & silencer on each motor but the 87' was just wicked. I went with the 88' because it was like new condition. I now have the oportunity to play with the ports alittle while it's getting rebuilt. I have seen the serv. bullitin on the early 80's AC430. Does this info transfer over to the LC?
 
Same engine just has water cooling
I had a slightly ported 430 LC and the ports were cleaned up and knife edged
 
Just put this up on another thread but here are some pics of my 400 that a mate "tidied up.
He ran the transfers out to the gasket edge, matched them to the crankcase edges and knife edged all the bridges. Smoothed the liner to barrel join and re radiused the inside of the transfers (hogged em out is the tech term...)husky rebuild 021.jpghusky rebuild 019.jpghusky rebuild 020.jpg
 
Ported or not unless you put it toghther yourself glueing the base gasket down and making sure it doesn't stick into the passages you don't know if that is an issue. I have found big globs of gasket compound sticking into those passages on some engines I have got.

The steel piece the exhaust pipe attaches to can be quite far from blending smoothly into the aluminum of the cylinder. I suppose the aluminum could be filled in but I have removed material from the steel.

The casting smoothness and the way the liner blends into the aluminum is real crude compared to that Italian 125 in my current avatar.

I would think if you are really intrested using the soft solder and figuring out what the squish thickness is would be in order. There is a thread on here about how you can get different thickness base gaskets from cometic. The ones I have got lately from Halls all said cometic on them though they don't list a choice.

fran
 
Thanks Fran, I have already cleaned up the exhuast flange. Thanks surprize, great pictures! THAT is the kind of help I am looking for. Any report on how that 400 ran afterwards? Was there any change in port size/demention on the cyl.sleave surface?
 
Unfortunately, ol mate decided my exhaust port needed a small lift....:eek: so it has a "boosted" top end on top of a strong bottom end and it just f*kin flies.... Real "flag" stuff (i just hang off the bars like a flag...)
Ive gone up from a 400 to 430 main jet and dropped the needle 1 clip and its smooth as off the bottom and then climbs hard onto the band. Would eat the 300 Kato ive got.

I didnt ride it before the teardown so i cant comment on its improvement but i rode a couple of 400's years ago and they were al ittle docile compared to this. just dont touch the lip of the exhaust port unless you want a turbo model!!!

I did a similar job on a 250 (2000) ktm years ago and it will match the 300 in a straight drag. it would pull a gear higher everywhere and would level peg later model 450's up until 80MPH when they would pull away.

Just pulled the barrel off the 300 ktoom and the factory have done it for me, she is neat as a pin straight out of the crate:( no easy hp!
 
Been watching this thread cause i have my barrel off at this time.

Done porting before on cars and was looking at my 82 500.

Is there some gains to be made on this one, looks decent.

IMG_6221_zps752eb918.jpg


IMG_6220_zps9663a69f.jpg


IMG_6219_zps6dc63261.jpg


IMG_6218_zpscbe6c38c.jpg


IMG_6217_zps60d74013.jpg
 
suprize said:
Unfortunately, ol mate decided my exhaust port needed a small lift....:eek: so it has a "boosted" top end on top of a strong bottom end and it just f*kin flies.... Real "flag" stuff (i just hang off the bars like a flag...)
Ive gone up from a 400 to 430 main jet and dropped the needle 1 clip and its smooth as off the bottom and then climbs hard onto the band. Would eat the 300 Kato ive got.

I didnt ride it before the teardown so i cant comment on its improvement but i rode a couple of 400's years ago and they were al ittle docile compared to this. just dont touch the lip of the exhaust port unless you want a turbo model!!!

I did a similar job on a 250 (2000) ktm years ago and it will match the 300 in a straight drag. it would pull a gear higher everywhere and would level peg later model 450's up until 80MPH when they would pull away.

Just pulled the barrel off the 300 ktoom and the factory have done it for me, she is neat as a pin straight out of the crate:( no easy hp!
Click to expand...


Any idea about how much he raised the exhaust port?
 
about .5 to 1mm, he was vague about it. check out the picks in my build thread of the finished work. its on about pg 5 of the resto section. he went to town....
 
These are porting mods for the 430 Auto = LC430

PORTING 430 AE CYLINDER BY PAUL ROONEY

Hi Michel. Ok it is no good porting an auto for top end power as the auto
only changes gear at maximum torque, & only revs out once in top gear. So it
needs to be ported for more mid range power which is of more use.
Exhaust from top standard = 40.mm, take it to 39.mm.
Exhaust wide standard = 58.mm Take it to 64.mm. Keep the sides of the
port as straight as possible.
Square off the top of the inlet booster ports.
Turn the cylinder upside down & drill 2 holes 1 each side of the inlet port.
Drill from the transfers to the inlet & then grind out till you make them as
large as possible & a nice shape. Do not worry if you cut into the cylinder
stud holes as the head gasket will seal it.
Once all this is done then take .25mm of the top of the cylinder.
You will need to go leaner in the needle jet & up one size on the main to
test. Have Fun Paul.

Here's the link that has photos http://www.cafehusky.com/threads/nauto-new-auto-430.24090/page-2#post-273415 post #26
 
two stroke tuning says that a single exhaust port can be run at 65% width of the bore diameter and that everything over that is a risk. Well, newer piston rings can take up to 70%, but a 430 exhaust port at 64mm wide is 74.5% of the bore! how can that last?
 
Martint93 said:
two stroke tuning says that a single exhaust port can be run at 65% width of the bore diameter and that everything over that is a risk. Well, newer piston rings can take up to 70%, but a 430 exhaust port at 64mm wide is 74.5% of the bore! how can that last?
Click to expand...

I am in no way endorsing the porting mods as stated by Paul Rooney, just forwarding info that I came across recently. You may want to discuss with the Paul, don't know if he frequents CH regularly?

I also find the intake modifacations quite ratical, I have a spare cylinder that I may experiment on over the winter...nothing ventured-nothing gained.

Is there a good two stroke tuning manual out there, I'd be interested is that.
 
I was just wondering because I had a little seizure on my wr 500 and cant figure out what happened.

you can read Gordon Jennings or Graham bells two stroke tuning books. lots of info :)

if anyone can state that a husky exhaust port can be ridden with a 64mm width I would love to hear from them! :) Would be nice to know it it works..
 
I have never seen a exhaust port in two parts, you mean it has a bridge running down the center of the port. Interesting, that would support the ring so you could have a wider opening. I would really like to see such an exhaust port, I would think that the exhaust gasses being so hot would warp the bridged portion between the two ports.
What models came that way?
 
Michel, Have you tried the Paul Rooney porting specs on your cylinder?? if so, has it held up, and what has it done to the power characteristics?
 
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