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View Full Version : 250 cc dirtbike engine in a racing lawnmower?



Titanium
12-15-2005, 09:09 AM
Ok so i used to be a lawn mower racer. yes it was pretty faster, i had it up to 55 once but now i wanna go fast. i'm thinkin about makin new motor mounts and puttin a yamaha yz 250 2 stroke in it. and if i put that engine in i'm gonna change the rear axle out so it can run a sprocket. i'm thinkin about usin a 4 wheeler axle with barrings from a go-kart but wats ur guys ideas so i can improve my plans.

Titanium
12-15-2005, 09:42 AM
anybody???

bwamos
12-15-2005, 10:53 AM
Originally posted by Titanium
anybody???

I'd look at 250cc Cart motors. They are already setup for your situation.

400exrules
12-15-2005, 11:12 AM
busa

Titanium
12-15-2005, 12:37 PM
i'd get the hayabusa engine or the kart engine but i'm lookin for this to be a fairly cheap project. plus i want gears so i can drop the clutch for the fun of it lol.

Die hard honda
12-15-2005, 12:56 PM
go for it, i think it would be sick

Titanium
12-15-2005, 01:34 PM
Ya i hope it'll be sick. but does anybody have any suggestions on i can rig up the shifter.

hotrodbelair
12-15-2005, 03:21 PM
i have a gokart with a 500cc motorcycle engine on it. for the shifter we just rigged up a cable that goes from the shifter on the motor to a shifter on right side of the seat. it works but dont work the greatest takes for ever to shift. but when it ran on 2 cylinders 2nd gear was fast enough for driving around the yard, its geared kind of high.

Titanium
12-15-2005, 08:09 PM
any other ideas?

Titanium
12-15-2005, 08:17 PM
any other ideas?

hotrodbelair
12-15-2005, 08:23 PM
It would be easier to come up with something if the motor was sitting on there so u had an idea of how everything is gonna go together. could have a linkage type system on there.

Titanium
12-15-2005, 08:30 PM
Originally posted by hotrodbelair
It would be easier to come up with something if the motor was sitting on there so u had an idea of how everything is gonna go together. could have a linkage type system on there.

Sounds like u kno wat ur talkin about. do u have any other good suggestions like ur others lol cus i really appreciate the help.

DAB516
12-15-2005, 08:41 PM
Sounds like you in over your head to me.

Titanium
12-15-2005, 08:43 PM
Originally posted by DAB516
Sounds like you in over your head to me.
Not really. i'm jus wantin to hear ppl ideas i already have a pretty good idea on how to do it i'm jus wantin to kno if anybody has any better ideas.

coolex
12-16-2005, 07:19 AM
my friend has a xr100 engine on a lawn mower and i have a go kart engine on my lawn mower i can get it up to 35 and he can go about 45 50 but a new axle is a must

Titanium
12-16-2005, 10:28 AM
i'm wantin to shoot for aroun 65 or 70 or maybe faster. my friend had a 12 horse briggs and straton engine with a homemade blower from a vaccum and made his own cams and was runnin a 2" pulley in the rear and a 6" pulley in the front. but anyways that thing was clocked at 85!:eek2: but i'm not gonna be running the orignal transmission like i said earlier i'm gonna get a 4 wheeler axle or sumthin and fabricate my own mounts and barrings etc...

Titanium
12-16-2005, 10:28 AM
i'm wantin to shoot for aroun 65 or 70 or maybe faster. my friend had a 12 horse briggs and straton engine with a homemade blower from a vaccum and made his own cams and was runnin a 2" pulley in the rear and a 6" pulley in the front. but anyways that thing was clocked at 85!:eek2: but i'm not gonna be running the orignal transmission like i said earlier i'm gonna get a 4 wheeler axle or sumthin and fabricate my own mounts and barrings etc...

Titanium
12-16-2005, 10:29 AM
woops sry double post

coolex
12-16-2005, 10:59 AM
ya mine and his both ran off four wheeler axles and they were chain driven not belt

Titanium
12-16-2005, 12:43 PM
ya i was planning on runnin a chain anyways cus i hate belt drives.

Titanium
12-16-2005, 04:10 PM
anymore suggestions because i started on the project today

tp300ex
12-16-2005, 08:51 PM
sounds like a good idea im thinking of puttin a yz or kx 125 in a lil mini choper:eek2:

Titanium
12-16-2005, 10:01 PM
i bet that thing would haul balls man.

Jake250ex
12-19-2005, 01:06 PM
i think they put a RM250 motor on a snapper in nitro circus