Vintage Grumble Posted October 31, 2020 Author Share Posted October 31, 2020 12 hours ago, Thphantum said: Quite happy to tow this down to Waikerimoana for you to do a group demo. Ha, will be a short demo with the way it's running atm, but thanks for the offer. Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 31, 2020 Share Posted October 31, 2020 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 31, 2020 Author Share Posted October 31, 2020 Today I had a nose at the least happy spare engine, mainly to see how hard changing the crank seals would be. The rear is 2 min job, and the front won't be that hard at all. Behind the front cover, CDI seems flash for a 50 year old motor, And behind the mag is the seal, easy as, Then I had a nose at the exhaust, sort of a weird set up, big open water cooled box, Big ol ports, So yeh, definitely not a twin pipe friendly sort of deal. Old plugs from current motor in boat confirm lean/hot, And my new high flow fuel delivery set up, ALSO, I think we might have been thinking about the tune pipe paulses incorrectly. The paulse makes it back to the port before it shuts, so that means the other port hasn't opened yet, thus the paulses shalt never meet. Also can confirm these motors have the pistons 180deg out. 3 Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 31, 2020 Share Posted October 31, 2020 Quote Link to comment Share on other sites More sharing options...
datlow Posted October 31, 2020 Share Posted October 31, 2020 Easy enough to join the motors together?? 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 31, 2020 Author Share Posted October 31, 2020 Wouldnt 2 strokes plugs always be a bit on the greasy/carbony side? 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 31, 2020 Author Share Posted October 31, 2020 1 minute ago, datlow said: Easy enough to join the motors together?? It's a slippery slope to becoming Ned.. 4 2 Quote Link to comment Share on other sites More sharing options...
tortron Posted October 31, 2020 Share Posted October 31, 2020 You wanna do a plug chop on fresh plugs. Can read em fine 3 Quote Link to comment Share on other sites More sharing options...
peteretep Posted November 1, 2020 Share Posted November 1, 2020 On 31/10/2020 at 21:49, Vintage Grumble said: Wouldnt 2 strokes plugs always be a bit on the greasy/carbony side? definitely not, when there is good fuel/oil/air ratios, the spark plugs look like normal. 5000km old spark plugs on my scooters are dry as and have a nice colour to them 2 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted November 1, 2020 Author Share Posted November 1, 2020 17 minutes ago, peteretep said: definitely not, when there is good fuel/oil/air ratios, the spark plugs look like normal. 5000km old spark plugs on my scooters are dry as and have a nice colour to them True, guess I've always gone a bit on the rich side, in the hope its less likely to seize. But by those charts up there, and looking at the plugs I pulled, it may not even be that lean. Mind you, gawd knows how long those plugs have been in there. Also, I only just learned a plug chop, literally means chopping the plugs open. I had confused a read with a chop, thinking the chop referred to cutting/chopping the power when at WOT. 1 Quote Link to comment Share on other sites More sharing options...
peteretep Posted November 1, 2020 Share Posted November 1, 2020 personally havent had much luck with chopping plugs, I think you need a really long straight to get some colour into the plug, but then its a total pain in the ass having to pull everything apart and destroy a plug. I have had a much better time just riding around and getting a feel of different throttle positions on the carb and referring them back to which jet/needle is affecting the power at that level. And a temperature gauge to make sure you aren't wayyyy out. Hard to imagine you need much more than a bit of adjustment on your thing though, as nothing has been grossly modified. I would be looking at maintenence items like seals and rebuilding the carb first 2 Quote Link to comment Share on other sites More sharing options...
tortron Posted November 1, 2020 Share Posted November 1, 2020 china O2 sensor and go ham with a wideband (probably not an issue with the sensor life as you wont be using it that much just to dial it in, 2 stroke snow mobile o2 sensors) last like 100 hours 2 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted November 1, 2020 Author Share Posted November 1, 2020 1 minute ago, tortron said: china O2 sensor and go ham with a wideband (probably not an issue with the sensor life as you wont be using it that much just to dial it in, 2 stroke snow mobile o2 sensors) last like 100 hours Actually, my broinlaw has a innovate wideband, if I bung that in before the water enters the pipe we should be all good. Does the oil bugger up the sensors? Quote Link to comment Share on other sites More sharing options...
tortron Posted November 1, 2020 Share Posted November 1, 2020 yeah a sensor used in a 2 stroke will generally have a shorter life. it can be hard to get a good reading depending on reverb/pulse too Quote Link to comment Share on other sites More sharing options...
nzstato Posted November 1, 2020 Share Posted November 1, 2020 Would one of those plugs which change colour based on rich/lean be a better option? Quote Link to comment Share on other sites More sharing options...
keltik Posted November 1, 2020 Share Posted November 1, 2020 3 minutes ago, nzstato said: Would one of those plugs which change colour based on rich/lean be a better option? I believe we both know a gentleman with some colortune plugs in a suitable ancient thread/hex size 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted November 1, 2020 Author Share Posted November 1, 2020 14 minutes ago, tortron said: yeah a sensor used in a 2 stroke will generally have a shorter life. it can be hard to get a good reading depending on reverb/pulse too I just talked to the broinlaw, he's keen to slap the wideband on and see what happens. 3 minutes ago, nzstato said: Would one of those plugs which change colour based on rich/lean be a better option? I didn't even know they were a thing? Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted November 1, 2020 Author Share Posted November 1, 2020 1 minute ago, keltik said: I believe we both know a gentleman with some colortune plugs in a suitable ancient thread/hex size We do? Quote Link to comment Share on other sites More sharing options...
tortron Posted November 1, 2020 Share Posted November 1, 2020 never had much luck with colourtune, wideband is so accessable now days Quote Link to comment Share on other sites More sharing options...
johnnyfive Posted November 1, 2020 Share Posted November 1, 2020 Yeah I've got an ancient pair of colour tune plugs. Feel free to pop em in, I'd expect questionable results though. If you could get wideband working I'm sure that would be preferable 2 Quote Link to comment Share on other sites More sharing options...
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