ktm/husky 300. whos spent time making more power?

eric82930

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Dec 20, 2007
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https://www.ebay.com/itm/Digital-Module-CDI-DC-AC-ADAPTER-UNIVERSAL-motorbike-quad-motorboat-PROGCDI/132797849003?hash=item1eeb5e5dab:g:l9cAAOSw-RRXCJb5

i tried to put this cdi on my 2 stroke today and decided against it because i don't have the setup to run dc electrics. my 450 had a much bigger 3phase stator and would kick start a clean recified dc to feed the cdi. this would be fine on an estart 2stroke though as long as the battery has 5v left in it, it would still kick.

the stock ktm 2k stator cdi charge coil only has a low voltage ac output to the stock cdi box so it must get multiplied inside the box to charge the hv capacitor...
i guess i could try to do a full wave recifier on it as a dedicated cdi feed but that would totally screw up the wonderful simplicity of my 2stroke....
 

portgrinder

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Nov 26, 2007
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Haven’t tried much more, other than a 15.5/1 head. Squish at .049 and about 190psi.
It bumps the entire curve up another 2-3pounds, so it’s near 37-40 tq for a pretty wide rpm band. That gets us up to ~8tq and 10hp in spots over stock
 

2smokin

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Portgrinder, It sounds like you may have had a 500? Just curious, If so what is the reason you are thinking of trying to get more power from a smaller bike?

Vibration, hard starting and narrow power are the reason I couldn't justify keeping my 500 I was really glad to see it go. Hopefully the brc might fix the first two issues. Iv'e been dabbling in ktm 360's and 380's lately and raising the exhaust port about an inch seems to be what they like to be a good snowbike.

And I don't agree with the "no replacement for displacement" in the field of snowbikes. If it was true why isn't the panthera in every snowbike out there by now....??? Every 450 made in the last 5 years makes more power than the 500's and they have half the power strokes. Its about airflow in this case which probably needs to be the main topic of this discussion on the 300's.

I'm not an engineer by any means and kinda sloppy in my approach to tuning but I ride snow 2-3 days a week oct - july and have tons field trial and error experience to see what works on the snow. My conclusion is stock mx bikes always do best because the factories tune them for peak hp. The big bores never seem worth it because they trade hp for torque because the peak airflow is choked off somewhere in the system. Big bores also vibrate more, start harder and are less reliable. High comp is almost always better for high altitude as long as it will still start.....

I'm super biased to 2 strokes and 1st choice would probably be a 60hp GP tuned counterbalanced 300. If the brc can make reliable 70hp it will probably be my 2nd choice until ktm starts building the 2 stroke 500SBS "snow bike special". It will come with the tires in a separate box with a warning label that says "INSTALATION MAY RESULT IN BODILY HARM OR DEATH"
I'm biased as well! haha, by GP standards https://www.vitalmx.com/forums/Non-Moto,21/2-stroke-250-Yamaha-made-97-hp-300-rpm-power band,1230012
of course its a twin and a 300rpm power band would be rough even with a cvt, But im certainly interested to see how reliable a 300 single would be in the 60-70hp range. Im thinking about getting a pipe from NPP like portgrinder has suggested in the past and throwing some compression and port work at my 18 300xc. I personally hate to slip the clutch so I would sacrifice a few hp to have a functional power band that i could roll in to. As far as the Brc reliably making 70hp that will be interesting.
 

portgrinder

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egt's were high relative to other factors that said it was tuned right. that usually means it needs more timing.The head smartened it up a lot. kinda does the same thing.

I might oblong the holes on the ignition pickup. get a degree or two to test anyhow.

if anyone wants the 13.3/1 head, let me know. I would sell it.

you need a wide powerband. and this 300 is real wide. its not gonna touch a proper running 500 but I bet it will be every bit as good as a strong 450

The BRC is a whole whack of cash. and its not in the new frame. and it doesn't seem to make much power
 

eric82930

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The rotating mass definately matters big time for fun factor even more so in the spring snow. It's exactly like on dirt. The 450s get the whole shot every time but the 2 strokes are still more zippy and fun. It's exactly the same difference between artic cat 800 and 1100t. It matters! I was even shocked when i switched from my 2k3 to the lighter 2k1 flywheel on my 380 long track. It felt like it gained 5hp (it didn't) but it's just the half second quicker spool up makes for bigger grins. It's so much more fun I'm willing to run the 2k1 without the extra watts for my grip heaters. But I'm the guy who REMOVED the e-start from my 150xcw so I could install the lighter sx flywheel. Take it for what it's worth. If your high marking ride a 4 stroke. If you just want to have fun get a smoker and do whatever is necessary to keep it from freezing up on deep days.
 

portgrinder

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Did some more runs.

- v force reeds are even steven. No gains
- Lectron gains 2-3 all the way thru. That was a 40. 38hv is almost the same. Gives up maybe one on top.
- sx box gained a couple in the mid and lost up top
-ktm fmf powerparts pipe lost a few in the mid and gained a couple up top.
-I moved the ign pickup to add timing. No real change.

So we ended up with a 40 Lectron, custom pipe and 15/1 head. Stock jug. C111 @ 30:1. Pretty good gains.
 

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wwillf01

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Did some more runs.

- v force reeds are even steven. No gains
- Lectron gains 2-3 all the way thru. That was a 40. 38hv is almost the same. Gives up maybe one on top.
- sx box gained a couple in the mid and lost up top
-ktm fmf powerparts pipe lost a few in the mid and gained a couple up top.
-I moved the ign pickup to add timing. No real change.

So we ended up with a 40 Lectron, custom pipe and 15/1 head. Stock jug. C111 @ 30:1. Pretty good gains.
Nice.... great torque numbers... who's pipe?

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