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ldj92

Stihl MS170...won't start?

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Sorry - thread derail..

 

Have there been any rotary valve chainsaws?

 

Not too my knowledge - although it was a useful inlet solution, it added weight and complexity to the engine - I don't believe that any saws ever had a power-valve either...before anyone asks!

 

The power-valve is a neat idea to give the two stroke engine a wider power-band, for those in the know, the power-band is controlled primarily by the height of the exhaust port - the solution was to make the top of the exhaust port adjustable with a moveable bar that raises the exhaust port as the revs increase - this has made a significant difference to two stroke engines within the biking industry by adding torque and a much wider power band to bike engines - also power has risen greatly from these engines!

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Thanks spud. I've been called many many many things in the past. Smart is going in the book tho. :lol::lol::lol::lol::lol::lol::lol::001_tt2:

 

Sorry but as it seems with most threads on the tech side of things I'm going to do a slight derail.

 

Mate has a two stroke motorbike, it floods very easily and starting is a bugger, I did read about the reed valves but I'm unsure to be honest. Anyway what do you know about two stroke bikes with reed valves, sorry will get the make and model and let you know what it actually is, just fishing to see what you know spud?

 

Yeah two strokes can be very easy but can really mess you up. I got this first hand with what has to be the most finicky, confusing, smallest, and excellent saw of all time. Can anyone guess the saw??? Spud you are not allowed to answer this question :001_tt2::001_tt2::001_tongue:

 

More likely worn emulsion tube/s in the carb/s than reeds I would imagine. Reeds never used to really give any hassles, altho we used to change them to boysen racing reeds for that extra .2 of a bhp lol.

 

Spud, know your a bit of a whipper snapper compared to me but remember the RD125lc mk3's, we used to file the peg off the powervalve and turn it slightly lol.

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More likely worn emulsion tube/s in the carb/s than reeds I would imagine. Reeds never used to really give any hassles, altho we used to change them to boysen racing reeds for that extra .2 of a bhp lol.

 

Spud, know your a bit of a whipper snapper compared to me but remember the RD125lc mk3's, we used to file the peg off the powervalve and turn it slightly lol.

 

Remember them - I go back to the RD400 air cooled twins, RD200s etc so yup, all from the day.

 

One thought - how is the OPs saw going, seems to have gone quiet - if he is still about, one fault may be the plastic ring that fits in the carb boot being missing - may have come out when the carb was fitted!

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Remember them - I go back to the RD400 air cooled twins, RD200s etc so yup, all from the day.

 

One thought - how is the OPs saw going, seems to have gone quiet - if he is still about, one fault may be the plastic ring that fits in the carb boot being missing - may have come out when the carb was fitted!

Now ur talking lol,i had a yellow rd400dx with twin allspeeds... :biggrin:

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Now ur talking lol,i had a yellow rd400dx with twin allspeeds... :biggrin:

 

Nice:thumbup: reckon you have around 5 years on me:lol:

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