2 stroke engine problem

vinnie13

hi lads,
i have a stihl ms170 which is roughly 5 years old and has done a savage amount of work and paid for its self ten fold never giving and trouble but lately shes a bit smokey and is putting fuel out the exhaust not a huge amount just enough to wet it that the eye can be seen

im thinking along the lines the rings are worn??
i have seen bits on ebay cylinder and piston rings etc genuine parts for about 60e so id gladly put her right if this seems the problem rather than 260 for a new one ..

all help welcome

tomwaterford

have u tried using a new spark plug/or maybe better quality mix(jus a taught)
I tink it is NGK BPMR7A is what is rated for

jimmyw

Well its hard to know with 2 strokes, because they are smokey at the best of times because of the oil mixed with the fuel.Maybe the mix was made too strong?

vinnie13

its just theres more smoke than usual,dont think its the mix i use the 500ml bottle with the ratio markings that came with the saw and always 50:1
it would have 3 fesh mixes a week.

thanks for the comment

jimmyw

Did you check the condition of the plug? You could check to see if there is much compression, although not accurate at all without a test gauge but as a general check you could put your finger over the spark plug hole and pull the chord to check for pressure.If she is running, I'd say compression is ok though.Carb might need adjusting possibly.

vinnie13

jimmyw wrote: »

Did you check the condition of the plug? You could check to see if there is much compression, although not accurate at all without a test gauge but as a general check you could put your finger over the spark plug hole and pull the chord to check for pressure.If she is running, I'd say compression is ok though.Carb might need adjusting possibly.

i just seen your post about plug,yea your spot on with the plug no. thats he one it takes,i got a new one earlier in the week..
there does seem to be loads of compression

Thelostcountry

Clean the Carb... and report back.

vinnie13

Thelostcountry wrote: »

Clean the Carb... and report back.

I'm going to give that a try over weekend cheers

The Glass Key

Also take the exhaust off and clean it. Not sure about all the Sthil's but the ones I have had have always had exhausts that split in two so you can get to the inside. Sometimes it will be a right mess with built up half burnt oil which just blocks the exhaust up.

vinnie13

Update after a spit and shine of carb etc..

Running like a dream back to her former glory
Thanks lads fir the advice

101sean

It's good when someone reports a happy ending and says thanks

vinnie13

101sean wrote: »

It's good when someone reports a happy ending and says thanks

happy all around:D,people take time to give advice and it can be anoying when you read a post and the OP never reported back grrrrr :mad::mad: