is it 2-stroke or 4-stroke

[madanorak]

Have inherited Johnson 10 HP, but don't know whether it is 2 or 4 stroke. Looks like 2 stroke, but have been told may be 4 stroke.<br /><br />If it is a 2 stroke, what mix?<br /><br />S/N H8512194, Model No HJ10R5W.Says made in Hong Kong. Also anybody know what year?<br /><br />Not used to Johnsons, have already got Mercury.<br /><br />Kev

 

[mikeyzx2]

Re: is it 2-stroke or 4-stroke

well if it's a four stroke it's gotta have an oil fill and drain. the head has to look a little different too.

 

[mikeyzx2]

Re: is it 2-stroke or 4-stroke

H stands for Hong Kong, J for Johnson, 10 for 10hp <br />I'm stuck on the R5W, according to codes, R stands for Rope start, the "5" I'm puzzled about, the W is model run or suffix. It looks like a newer model number, but the model year would compose of two letters

 

[madanorak]

Re: is it 2-stroke or 4-stroke

Thanks Mikey<br /><br />The fact that the carb is at the crank end of the block suggests it is 2 stroke, but have been told is an early 1990's so could be 4 stroke.<br />Been given bits of info from different people,-"a little knowledge is a dangerous thing" comes to mind !!<br />I'm sure somebody on this forum will know.<br /><br />It's got good compression on both cylinders and is in very good clean condition from the outside, but I will not start it until I know what it is, don't want to wreck it.<br /><br />Thanks Kev

 

[muskrat]

Re: is it 2-stroke or 4-stroke

double check model & serial number!!!!!!!!!!!!!!

 

[umblecumbuz]

Re: is it 2-stroke or 4-stroke

Don't really understand why you won't start it?<br /><br />You can fire up a four stroke with two stroke mix without problems. Put a small amount of mix in your tank and fire up. The motor will run normally whether it is 2 or 4 stroke, and you'd find out immediately what it was.<br /><br />If it is a four stroke, just drain off the excess gas mix and refill with appropriate fuel. Don't waste the mix - put in in your car.

 

[umblecumbuz]

Re: is it 2-stroke or 4-stroke

Don't really understand why you won't start it?<br /><br />You can fire up a four stroke with two stroke mix without problems. Put a small amount of mix in your tank and fire up. The motor will run normally whether it is 2 or 4 stroke, and you'd find out immediately what it was.<br /><br />If it is a four stroke, just drain off the excess gas mix and refill with appropriate fuel. Don't waste the mix - put in in your car.

 

[Dunaruna]

Re: is it 2-stroke or 4-stroke

Just mix 2 stroke oil into the fuel tank @ 50:1.<br /><br />If it's a 2stroke it won't sieze, if it's a 4stroke it may smoke a little but won't cause any damage.<br /><br />Aldo

 

[mikeyzx2]

Re: is it 2-stroke or 4-stroke

alright I can't find any evidence that it's a four stroke. If it was a 99 or newer there would be a "4" after the hp number. if it was older than that there would be a code beginning with "F" after the hp number. Plus since the carb is on the crank side that has to rule out being a four stroke. where would you be adding oil?

 

[madanorak]

Re: is it 2-stroke or 4-stroke

Thanks to all who have answered, you've confirmed my suspisions that it is 2 stroke.Will probably start it up at the weekend, will let you know.<br /><br />I will still welcome any other comments that anybody would like to leave.<br /><br />Thanks again,<br /> Kev

 

[jim dozier]

Re: is it 2-stroke or 4-stroke

I think that you should completely dismantle the engine so that we will all know for sure whether its a 2-stroke or 4-stroke!

 

[madanorak]

Re: is it 2-stroke or 4-stroke

Thanks to all who replied.<br /><br />Its a 2-stroke.<br /><br />Had it out on the sea 2 weeks ago, went to Cornwall for a weeks holiday. After adjusting throttle and mixture, it went like a dream. Only on a 3m inflatable, couldn't keep it at WOT, too scary !!<br />More stable with more than 1 in boat. Had some good fun, caught some mackeral and put 'em on the BBQ.(killed & gutted them first !!)<br /><br />Kev

 

[RPJS]

Re: is it 2-stroke or 4-stroke

Hi Kev<br /><br />I don't belive you.<br /><br />If you live in Brum and go to Cornwall on holiday you can't have a 3mtr inflatable with a 10hp motor, it has to be a 17' Fletcher with a minimum of 150hp on the back