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Discussion Starter · #1 ·
hey guys i was looking through CL and i seen a McCulloch 250 chainsaw, which i believe is an 80cc chainsaw.

my question is, would this motor make a minibike or pocketbike move well???

also would anybody happen to know which model motor came in the 250, its not the larger super 250 which has a slightly larger motor.

i have a vintage minibike and a couple vintage go karts and im wanting a cool older mcculloch motor for it but cant afford the actual mcculloch kart motors.

any help would be appreciated
 

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80cc engine properly ported and blueprinted will pull a bike to some nice speeds.....I had a 70cc McCulloch on my Blata 2.5 and the kart it came off was hitting the 85mph zone on radar but its also a bit more modded....





Yours could be like this one if ported and modded right...55mph isnt too shabby out of an engine like this...

 

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Discussion Starter · #3 ·
wow im gonna get it. the guy wants to trade for an electric motor, and i happen to know where i can get one for $5 in the morning. i just hope it still works. if i cant trade then the price is $60 obo so ill offer $30 and haggle from there
 

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i have a mculloch farm boss from like the 80's it had a 18-20" bar with a 80cc motor and from what i see it will work doing the very same just building my own frame ect. i wish u luck with urs keep us updated would love to see how it turns out
 

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Well I grabbed it. I really hope it will work. It seems like it should, its got the third port It's a 80cc motor. I didn't make the guy start it but he said it ran great , I was in a hurry and that has bit me in the as once or twice.

So it is a MCculloch 250

Could you possibly tell me what steps need to be taken to make this motor decent for a minibike, pocketbike or go kart. I havnt decided what to use it on yet, I'm gonna make a mount that works with them all

What signs might tell me that this would make it a good toy motor? Or couod someone tell me which kart motor it is most like???

Ok I tore it apart, at least down to what looks to me like a kart motor, one prob i see is the handle is built into the manifold. Can I cut the manifold out of there,, and if i were succesful would it work like that?
 

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mine im using for a bike proj im building a frame from tubing the manifold i think i know what ur talking about being in the handle its up to you kinda i mean if ur not going for prof look who cares if theres a handle on a cart motor mines a 1986 farm boss 80cc the parts are all separate except the pull start so i remaking the sheetmetal for the blower housing to make it look au natural lol but anyways anyone know whats the best clutch to use on these engines that would fit where to get it?
 

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mine im using for a bike proj im building a frame from tubing the manifold i think i know what ur talking about being in the handle its up to you kinda i mean if ur not going for prof look who cares if theres a handle on a cart motor mines a 1986 farm boss 80cc the parts are all separate except the pull start so i remaking the sheetmetal for the blower housing to make it look au natural lol but anyways anyone know whats the best clutch to use on these engines that would fit where to get it?
The clutch mounts vary.....Theres clutch mount adapters for the crankshafts or if your handy you can machine your own and integrate them into the mount with a bearing...............



 

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Discussion Starter · #9 ·
mine im using for a bike proj im building a frame from tubing the manifold i think i know what ur talking about being in the handle its up to you kinda i mean if ur not going for prof look who cares if theres a handle on a cart motor mines a 1986 farm boss 80cc the parts are all separate except the pull start so i remaking the sheetmetal for the blower housing to make it look au natural lol but anyways anyone know whats the best clutch to use on these engines that would fit where to get it?

actually i didnt like the look of the handle and box, so i hacked it up and made this. pic below i hope. dont make fun of my work too much lol i know its not a pro job, i did it with my grinder i used for laying tile.

i was told for mine to use a max torque 5/8" clutch, which luckily i got a brand new one on a motor purchase a few months ago so ill be trying to use that. im adding a pic of my shaft too, maybe one or both of you guys can tell me how youd go about getting the clutch to stay on
 

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Discussion Starter · #10 ·
The clutch mounts vary.....Theres clutch mount adapters for the crankshafts or if your handy you can machine your own and integrate them into the mount with a bearing...............



cam2 how would you make a max torque clutch stick on this shaft??? if you wouldnt mind giving me some pointers. there is no keyway on there. should i have it keyed?
 

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cam2 how would you make a max torque clutch stick on this shaft??? if you wouldnt mind giving me some pointers. there is no keyway on there. should i have it keyed?
Just simply grind in a keyway slot into the shaft and if you can try to use the outer shaft nut as extra security................My shaft was threaded internally so I used a bolt...My clutch is 5/8 and my shaft was 1/2" but I used a 1/2" to 5/8" sleeve to make up for the difference...WW grainger has them....$4bux for 3 sleeves........

The clutch is gonna lockup way too early....If you disassemble the clutch and reduce the diameter of the friction disc aswell as get a stronger spring thats wrapped around it you can customize the grab rpm so the engine doesnt load up on the lowend too much...

For the exhaust use a stock exhaust box and mod it to work with a round pipe flange.......

 

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Discussion Starter · #14 ·
Alchohol/methanol that wasnt flushed out or ethanol corrosion.............

dang, now im hoping comes the part where you say " oh bootney, thats no big deal. it can be easily fixed" but i kinda got a fealing that your not gonna be saying that.

could you tell me how you would clean it, like what you would use to break it free and how to stop the corroding or remove it.

i know that 99.9% of anybody with a brain would pull any salvagable parts and trash the block, but i have a sickness where i just cant do it. i would at least like to make an attempt at fixing it, and if i can free it id be willing to have the cylinder machined just because id hate to toss it if there is even a fraction of a chance i can run it at some point.
 

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dang, now im hoping comes the part where you say " oh bootney, thats no big deal. it can be easily fixed" but i kinda got a fealing that your not gonna be saying that.

could you tell me how you would clean it, like what you would use to break it free and how to stop the corroding or remove it.

i know that 99.9% of anybody with a brain would pull any salvagable parts and trash the block, but i have a sickness where i just cant do it. i would at least like to make an attempt at fixing it, and if i can free it id be willing to have the cylinder machined just because id hate to toss it if there is even a fraction of a chance i can run it at some point.
The only thing I can see is soaking it in a 5 gallon bucket with a few gallons of diesel fuel to soak it in overnight then try wirebrushing out some of the corrosion in order to get it disassembled.Id also have my fingers and toes crosssed too......All the internal bearings and possibly the crank journal will be unsalvageable.....There was only one time I forgot to purge the alky/methanol from one of my IAME racing kart engines.....That was a $3500.00 mistake back then and my dad was pretty furious......
 

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Discussion Starter · #16 ·
The only thing I can see is soaking it in a 5 gallon bucket with a few gallons of diesel fuel to soak it in overnight then try wirebrushing out some of the corrosion in order to get it disassembled.Id also have my fingers and toes crosssed too......All the internal bearings and possibly the crank journal will be unsalvageable.....There was only one time I forgot to purge the alky/methanol from one of my IAME racing kart engines.....That was a $3500.00 mistake back then and my dad was pretty furious......

wow $3500 i would be a bit butt hurt myself, luckily this motor was free.99 so no loss and i figure some parts are salvagable if i cant save her. im working on getting more of these motors, i wanna learn how to make them super fast.

im just gonna take my time trying to free this motor up, id love to be able to use it at some point.

hey cam2 would you happen to have a mcculloch style motor mount???
 

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wow $3500 i would be a bit butt hurt myself, luckily this motor was free.99 so no loss and i figure some parts are salvagable if i cant save her. im working on getting more of these motors, i wanna learn how to make them super fast.

im just gonna take my time trying to free this motor up, id love to be able to use it at some point.

hey cam2 would you happen to have a mcculloch style motor mount???
Hold onto the engine block and the crank.......You can sell the block and crank as rebuildable race engine cores.....

Yeah $3500.00 back then is something equivilent to like $9000 now...I worked quite a bit of saturdays to payback the mistake.............

I do have some mounts but not ones Im willing to part with...Theyre not too hard to make out of 3/16" thick plate steel..............No welder needed...just a good vise..plumbers torch ..drillbits and a good carbide holesaw.....



My drag minibike I utilized a briggs 5hp lower case to mount a methanol huffing 2 stroker in it..........

 

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Discussion Starter · #18 ·
Hold onto the engine block and the crank.......You can sell the block and crank as rebuildable race engine cores.....

Yeah $3500.00 back then is something equivilent to like $9000 now...I worked quite a bit of saturdays to payback the mistake.............

I do have some mounts but not ones Im willing to part with...Theyre not too hard to make out of 3/16" thick plate steel..............No welder needed...just a good vise..plumbers torch ..drillbits and a good carbide holesaw.....



My drag minibike I utilized a briggs 5hp lower case to mount a methanol huffing 2 stroker in it..........


great, the reason i was asking is cause i was gonna try to make one and was hoping you could tell me whyat angle to put the mount at, and why the motor has to be angled when mounted.
 

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Discussion Starter · #19 ·
i know it is a lot to ask and wont be disappointed if you cant or wont. but is there any chance you could measure one so that i can try to mock it up. i dont know anybody in the area i live in that has any things like this stuff, no shops around here.
 

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i know it is a lot to ask and wont be disappointed if you cant or wont. but is there any chance you could measure one so that i can try to mock it up. i dont know anybody in the area i live in that has any things like this stuff, no shops around here.
To make one all you need is 3/16" thick cold rolled steel thats 6" wide and between 12 and 16" long......as far as the holes and shaft housing boss youre gonna have to remove the flange and make a template for the engine mount screws/shaft boss casting...

You definately need a disk like this one.............

http://www.ebay.com/itm/Vintage-McC...96933?pt=Go_Karts&hash=item4abe1f3825&vxp=mtr
 
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