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 .
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
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
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.
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
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