We have been watching your videos non stop since we got my son his 2007 KTM 85SX. Unfortunately it needs a new cylinder to get it running. Any chance you know where I might find one?
@@HPRaceDevelopment Unfortunately not around where we live. Newer KTM 85s around here are generally around $3000. I have seen some reports of retrofitting a 2013-2017 cylinder, ever heard of such a thing? Might have to try that.
@@coastalcustomknifeworks3718 The power improvement and overall chassis and suspension improvement, improved clutch durability and bike is far worth it. You can dump 1500 into yours rebuilding it and its a ways off the current gen
What dyno and software are you running? We regularly pulled 28hp out of a CR80 and as much as 29.5hp on a Dynojet chassis dyno so I am wondering if the difference is in the dynamometer.
I'd pay very very good money to see 29.5 on an cr based 80-85cc size engine on my dyno in an mx form. If in kart form, with little more rpm it would be relatively easy. I built the dyno, and the FEA result of inertia and weight was darn near spot on for the real weight. We then used a gravity system with a "known" weight to verify inertia I trust it's rear tire accuracy very much vs many of the dyno's I've been on and see. I own a commercial dyno that reads quite a bit higher than mine as well. I do not believe it to be accurate to the tire.
@@HPRaceDevelopment I’m just thinking there is a disconnect somewhere between dyno’s, although I always thought the Dynojet was quite accurate and more importantly repeatable. I’m trying to remember and find the dyno sheets but pretty sure the peak was near 11,500. Really I focused more on average peak as that is a more relatable number.
@@jeffmanges874 I don't think many people have put much effort into understanding their dyno. Mine repeats years apart on same bikes, on different conditions... I can make it read anything - we feel it reads accurately based of science and physics and the known constant of Gravity as the validation method.
@@jeffmanges874 I'd bet good money on our dyno right now your package was under 23, an excellent results for older gen 85's. It's all relative to the dyno - not the number....also something people struggle to grasp.
@@HPRaceDevelopment I am leaning towards thinking it would read lower on your dyno as well however I very much doubt it would be as low as 23hp. The math on my port work, head etc… supports the 29hp numbers we saw. The package I actually ran dynoed at 28.5 which developed a more broad power band and a higher average peak.
no. gear ratios dont change power (in theory - some gear ratios would have a little worse friction than others but very small differeces). If you want to know why gear ratios dont change power - high school physics class somewhat answers it - which woukda made high school way cooler if they taught this kinda info
Man the ignition boxes he makes work wonders.
That was a noticable hit the 105 CDI
Cool video's, if you ever get a chance would be interesting to see graphs from 125sx-150sx
good idea
@@HPRaceDevelopment do you have tested a 150 cdi on a tuned 125sx ?
Dude knows his shit. When I need a rebuild I will be getting it done from him. I have his tune on my 22 ktm 500 and it's an animal .
We have been watching your videos non stop since we got my son his 2007 KTM 85SX. Unfortunately it needs a new cylinder to get it running. Any chance you know where I might find one?
Not on an 07
sucks to say but might be time to try and find an 18 or newer bike
I bet a 2019 could be had for 1500
@@HPRaceDevelopment Unfortunately not around where we live. Newer KTM 85s around here are generally around $3000. I have seen some reports of retrofitting a 2013-2017 cylinder, ever heard of such a thing? Might have to try that.
@@coastalcustomknifeworks3718 The power improvement and overall chassis and suspension improvement, improved clutch durability and bike is far worth it. You can dump 1500 into yours rebuilding it and its a ways off the current gen
Luvin these videos !! Keep at it
Do you wanna make a 150sx video?
I have a 22 model.
Please do this bike!!
We did one video a while back and never published it. I wouldn't mind reshooting it
Love this content
What dyno and software are you running? We regularly pulled 28hp out of a CR80 and as much as 29.5hp on a Dynojet chassis dyno so I am wondering if the difference is in the dynamometer.
I'd pay very very good money to see 29.5 on an cr based 80-85cc size engine on my dyno in an mx form.
If in kart form, with little more rpm it would be relatively easy.
I built the dyno, and the FEA result of inertia and weight was darn near spot on for the real weight. We then used a gravity system with a "known" weight to verify inertia
I trust it's rear tire accuracy very much vs many of the dyno's I've been on and see. I own a commercial dyno that reads quite a bit higher than mine as well. I do not believe it to be accurate to the tire.
@@HPRaceDevelopment I’m just thinking there is a disconnect somewhere between dyno’s, although I always thought the Dynojet was quite accurate and more importantly repeatable. I’m trying to remember and find the dyno sheets but pretty sure the peak was near 11,500. Really I focused more on average peak as that is a more relatable number.
@@jeffmanges874 I don't think many people have put much effort into understanding their dyno. Mine repeats years apart on same bikes, on different conditions...
I can make it read anything - we feel it reads accurately based of science and physics and the known constant of Gravity as the validation method.
@@jeffmanges874 I'd bet good money on our dyno right now your package was under 23, an excellent results for older gen 85's. It's all relative to the dyno - not the number....also something people struggle to grasp.
@@HPRaceDevelopment I am leaning towards thinking it would read lower on your dyno as well however I very much doubt it would be as low as 23hp. The math on my port work, head etc… supports the 29hp numbers we saw. The package I actually ran dynoed at 28.5 which developed a more broad power band and a higher average peak.
Have you ever dynoed or worked on italian husqvarnas?
I always thought the original ones were swedish? No I have not
@@HPRaceDevelopmentthey are swedish
@@Tahmanakkithe brand is Swedish but before KTM , it use to be own by an Italian company that why he talked about Italian's Husqvarna
Does chain and sprocket size change dyno number
no. gear ratios dont change power (in theory - some gear ratios would have a little worse friction than others but very small differeces). If you want to know why gear ratios dont change power - high school physics class somewhat answers it - which woukda made high school way cooler if they taught this kinda info