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View Full Version : 1985 250SX hp? mods?


biggiefl
03-18-2005, 02:33 PM
I bought a 85 250SX new in 86 when I was 16 and kept it for about 5 years or so when I traded it for a 85 Tecate, then a 86 250R, etc. Recently I bought my neighbors Dad's 85 250SX which is pretty much mint. I just replaced the 22x11x8's with a set of 18x11x8 Carlisle Badlands and another set of 20x10x9 Factory 300EX rims/tires. I know I cut top end by switching to smaller tires but I really hate the marshmellow feel of the 22's. Sucks we can't just change a sprocket. Other than rims and tires, what other mods are anyone running on these and who sells aftermarket parts for a 20 yr old trike that was not the most popular or fast.

Anyone know how many HP these made and what the redline is? DO they have a rev limiter?
84KXTtecate
03-19-2005, 10:43 PM
I belive they make in the nieghborhood of 18hp, I think it redlines at about 9,000 rpm maybe a little more. I had a set of badlands, they are great sports type tire.
Oldschoolin86
03-20-2005, 09:16 AM
A trx250x makes 15hp stock and a 300ex makes just under 17hp stock. I highly doubt an SX makes more then these so I'll bet it's closer to 13-14hp and 9000rpm would be lucky.
ATCnut
03-20-2005, 01:32 PM
Stright from the factory honda sx manual:

"Maximum Horsepower 18 PS/7,000 rpm"
straight pipe
03-20-2005, 02:04 PM
well i think cobra sells the only performance noise can available now adays. but what i did was i totally cut the arrestor off, it sounds really good and there is a noticable gain in power,the other thing i did was install a k&n, take the cover top off to experience the full effect.i am toying with the dail a jet, i may go for it soon. but the best mod for any atv/c is tires. i have mudlites and they grip like a bugger and makes the trike pull hard.i was playing with my buddy who has a stock 350x and he was shocked how i kept up with him.:demon:
Oldschoolin86
03-20-2005, 05:16 PM
Originally posted by ATCnut
Stright from the factory honda sx manual:

"Maximum Horsepower 18 PS/7,000 rpm" At the crank maybe. It's closer to what I posted at the rear.
biggiefl
03-20-2005, 07:30 PM
Thanks....I remember something about 7500rpm but hey it's been almost 20 years:wtf: