fix my engine

[chevy_cow]

hi every body this is my first post!

i would like to make a motorized bike. i have a poulan chainsaw(that has been lying around) i would like to use but, it is acting funny. it starts runs for 2 seconds and stops i cant move foward with my project unless it is fixed. does any one have any suggestions on how to fix this problem?

 

[Kaptain Krunch]

my first suggestion is to not use a chainsaw unless its above 50cc, and even then its iffy. Most saws have a tapered shaft and most stock clutches (with the exception of the older saws) are wimpy.

Anyways, it sounds like your carb. Clean it really good, Put it back together then turn the high and low speed needles all the way in then turn them out 1.5 turns each, that should get it started. Adjust the low needle while your idling, then adjust the high while the engine is WOT.

 

[chevy_cow]

thx i doubt it is above 50cc but chainsaw bikes are all over the internet. when you google "chainsaw bike" 739,000 results come up, and i saw a video of a guy with a little weed eater engine on a bike and he said it did like 20 mph...
anyway i will try to fix that tomorrow.

 

[Kaptain Krunch]

Oh for some reason when you said that i was thinking minibike...yea chainsaw bikes can do pretty good, again the bigger the better. what kind of poulan do you have? the older ones were sometimes decent, but these newer ones are just sad. I actually got about half way through making a chainsaw bike then ended up moving on to more powerful things, i'm planning on finishing it sometime. I got a free 50cc mcculloch from the 70's, when they were pretty good. If i were you i would put an ad on craigslist looking for a cheap or free chainsaw, thats what i did and i got some offers of fairly cheap 90cc stihl's and other big saws.

 

[Kenny_McCormic]

Bigger/older saws are worth far more than a similar sized engine.

 

[Kaptain Krunch]

Bigger/older saws are worth far more than a similar sized engine.

What do you mean a similar sized engine? like a 2hp industrial? Its a pro mac 10-10 automatic, i dont think its worth all that much.

 

[chevy_cow]

ok, i tried to fix it like kaptain said, i cleaned the carb inside and out adjusted the needles ,but it runs the same as before i could not adjust the needles while it was running because it did not run long enough.

 

[Kaptain Krunch]

hows the airfilter? good sparkplug? did you replace the diaphram or just clean it? also how old is the gas?

 

[chevy_cow]

pretty clean air filter ,good spark, new 40/1 chainsaw gas, and whats the diaphram?

 

[Kaptain Krunch]

The diaphragm is a part in the carb that often goes bad with saws that sit for a while, i suggest buying a rebuilt kit for the carb, there only like 8 bucks.

the thing hes holding in the first pic is the diaphragm

 

[chevy_cow]

yep i did see some thing like that, how can i tell when it is bad?

 

[Kaptain Krunch]

as far as i know you cant, but a rebuilt kit is under $10, and its worth it if it works.

 

[chevy_cow]

thanks

 

[chevy_cow]

update:
OK, i have been looking around for the right carb kit ,i found the saw is a Poulan 2250 2.2c.l. Super Clean, but their are like 8 types of 2250 kits. theirs 2250, 2250 type 1, 2250 type 2,and up to type 7. I don't know which type of kit to buy.


Thanks

 

[Kenny_McCormic]

What do you mean a similar sized engine? like a 2hp industrial? Its a pro mac 10-10 automatic, i dont think its worth all that much.

$100+ per foot of bar length.

 

[Kaptain Krunch]

$100 per foot of bar length.

Already welded the handle to the bike, but it is supposed to have an 18" bar on it, the guy who gave me it kept that.

Chevy cow, take the carb off and bring it to a lawnmower shop, thats what i did they just found me the kit.

 

[chevy_cow]

i will do that sometime soon thx.

 

[chevy_cow]

Thanks

 

[mike75925]

check your fuel line, and your clutch sometimes the clutch is hung up and hinders operation of the engine. on some of the diaphrams, if meant to be wet or dry there will be a spot that is contradictory the rest.

 

[mike75925]

oh wait i think that only works on the rubber type!