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View Full Version : Would a 3.5 HP engine be a decent motor?

CyB3R_D3MoN
10-29-2009, 12:12 PM
With the right gearing. Would it be able to pull about a 240 pound person? i just want a motor to mess around with for right now. And what can i do to increase power in the motor? like boreing, kits, like performance stuff. I would appreciate it if i could get some help.


-Thanks:auto:
Gearstix
10-29-2009, 01:05 PM
With the right gearing. Would it be able to pull about a 240 pound person? i just want a motor to mess around with for right now. And what can i do to increase power in the motor? like boreing, kits, like performance stuff. I would appreciate it if i could get some help.


-Thanks:auto:

I had an old 3hp Tecumseh on my yard kart when I bought it, and it pulled my self around. I weight 280.

As for performance, you will have to give us more information than just 3.5hp. Theres more than one manufacturer of engines.
solomon
10-29-2009, 01:58 PM
you could make it work with the proper gearing but it wont go fast. As a matter of fact these engines are soo cheap they typically have a plastic cam
Russ2251
10-29-2009, 02:36 PM
these engines are soo cheap they typically have a plastic cam High end engines have them as well. Nothing wrong with them.
EagleTalons
10-29-2009, 03:43 PM
High end engines have them as well. Nothing wrong with them.

High end engines as in high hp or highly modified?
motor_head
10-29-2009, 04:12 PM
High end engines as in high hp or highly modified?
nether just better motors higher quality
all the newer little(i think like <5hp?) motors have plastic cams
Russ2251
10-29-2009, 05:27 PM
I've seen a lot of them over the last 12 years or so.
Have not seen a cam related failure yet.
oscaryu1
10-30-2009, 05:22 AM
B&S 3.5's are a great hybrid. Bore similar to a 5hp and stroke of a 3hp.
modelengineer
10-30-2009, 05:59 AM
I had a 3.5hp and it was terrible. Even with 8:1 gear ratio it was very slow accelerating. I weigh 180 lbs.
anderkart
10-30-2009, 10:25 AM
If you already own the engine and dont have the bucks for something better, give it a shot. If your thinking about buying it, how much is it going to cost ya? (what brand/model are we talking here?)
JerryAssburger
11-05-2009, 09:40 PM
A friend of mine had a B/S 3.5 on his kart........ BIG FUN and it scooted along fine. It could do close to 30 with him in it . (220 lbs.) What I like about the B/S 3.5 is that it's the most powerful "Small-Block" of the B/S motors... it'll fit in the same spot a 2hp will because of the footprint and shaft size/ placement. The fuel tank might stick down lower, but that's usually not an issue.
vandancouver
11-07-2009, 09:14 PM
cmon man i have a 3.5 on a small kart of mine, with a cheap centrifigual clutch. ive been clocked at 46 mph. govenor removed, tires are about 8 inches tall, header, intake, port and polish and a basic tune up . i weigh 220
modelengineer
11-07-2009, 09:23 PM
LOL, how long did it take you to get to that speed? 2 - 3 minutes?
JerryAssburger
07-30-2010, 10:20 PM
cmon man i have a 3.5 on a small kart of mine, with a cheap centrifigual clutch. ive been clocked at 46 mph. govenor removed, tires are about 8 inches
My friend's kart was still governed and it was completely stock. It had great get-up-and-go compared to my B/S 80000 series engine. (1 extra cubic inch makes a difference!) I guess my point is, this would make a great motor to "develop" when nothing else will fit.