Vintage Grumble Posted October 19, 2020 Author Share Posted October 19, 2020 1 hour ago, HighLUX said: Repower with bike motor plz I has a GPZ600 in the shed, and did think about it, but probably too long. Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 19, 2020 Author Share Posted October 19, 2020 Also, not sure what they do about gearbox/clutch/extra junk in bike motors when they put them in boats? Just leave it in there or remove it all? Quote Link to comment Share on other sites More sharing options...
nzstato Posted October 19, 2020 Share Posted October 19, 2020 2 hours ago, Vintage Grumble said: Also, not sure what they do about gearbox/clutch/extra junk in bike motors when they put them in boats? Just leave it in there or remove it all? A few have done it but its a hassle, most dont even go there and get jetski running gear to drop in. 1 Quote Link to comment Share on other sites More sharing options...
tortron Posted October 19, 2020 Share Posted October 19, 2020 how many rpm does a jet unit like, 10000? Quote Link to comment Share on other sites More sharing options...
anglia4 Posted October 19, 2020 Share Posted October 19, 2020 sequential shifting boat skids sounds pretty rad 3 Quote Link to comment Share on other sites More sharing options...
kyteler Posted October 19, 2020 Share Posted October 19, 2020 Just something to consider, if you hadn't. In terms of a panic situation, in a jet boat you have no steering when you aren't on power. So if you need to turn in a hurry you need to power on, not off which depending on the situation may well go against natural instincts. Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 19, 2020 Author Share Posted October 19, 2020 12 hours ago, tortron said: how many rpm does a jet unit like, 10000? It sounds like a lot of big boy jet boats with V6's and small/jap V8's aim to do around 4500rpm, I guess you have to try get the bite of the impeller correct so you have enough grunt to drive it, but not too much grunt that you can cause cavitation? / I don't really have a clue TBH. 52 minutes ago, anglia4 said: sequential shifting boat skids sounds pretty rad I've seen a few mini boats with road bike motors, but never looked into how they do the drive? I'd be tempted to strip the gearbox and clutch out or even remove the housing if possible, to make it simpler and lighter. But as mentioned above, probably not worth the effort. 23 minutes ago, kyteler said: Just something to consider, if you hadn't. In terms of a panic situation, in a jet boat you have no steering when you aren't on power. So if you need to turn in a hurry you need to power on, not off which depending on the situation may well go against natural instincts. True that, I spent a lot of time on stand up jet skis as a young man, so kinda know what to do. Mind you, jumping off a stand up is easier than getting out of a tiny boat in a hurry / i'll probably struggle to get into trouble in such a slow boat, lololololols. 1 Quote Link to comment Share on other sites More sharing options...
johnnyfive Posted October 19, 2020 Share Posted October 19, 2020 Yeah I feel like you're gonna be WOT even when slowing down, damn it'll look cool doing it though, if maybe a bit clown car spec though puhuhu. 1 1 1 Quote Link to comment Share on other sites More sharing options...
kyteler Posted October 19, 2020 Share Posted October 19, 2020 Boat equivalent of this? 1 2 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 19, 2020 Author Share Posted October 19, 2020 I hope I can get into it, without flipping it over, lololols. 3 1 Quote Link to comment Share on other sites More sharing options...
nzstato Posted October 19, 2020 Share Posted October 19, 2020 2 hours ago, Vintage Grumble said: It sounds like a lot of big boy jet boats with V6's and small/jap V8's aim to do around 4500rpm, I guess you have to try get the bite of the impeller correct so you have enough grunt to drive it, but not too much grunt that you can cause cavitation? / I don't really have a clue TBH. I've seen a few mini boats with road bike motors, but never looked into how they do the drive? I'd be tempted to strip the gearbox and clutch out or even remove the housing if possible, to make it simpler and lighter. But as mentioned above, probably not worth the effort. True that, I spent a lot of time on stand up jet skis as a young man, so kinda know what to do. Mind you, jumping off a stand up is easier than getting out of a tiny boat in a hurry / i'll probably struggle to get into trouble in such a slow boat, lololololols. 1. Yes 'cavitation' is the water boiling because your're drawing too much vacuum into the unit than what you can flow out the back end. It sounds like you're driving a concrete mixer. 2. From what I read the solution is to drive the jet unit off the back of the clutch, typically have to manufacture a bellhousing up for a new shaft. 3. If in doubt, right foot... 1 Quote Link to comment Share on other sites More sharing options...
HighLUX Posted October 19, 2020 Share Posted October 19, 2020 Leave bike motor complete and couple jet unit to the sprocket shaft then select what gear is 1-1 drive and do hoons, leave clutch intact so you can clutch in for no drive 1 Quote Link to comment Share on other sites More sharing options...
keltik Posted October 19, 2020 Share Posted October 19, 2020 31 minutes ago, HighLUX said: clutch in for no drive That would be so convenient. I have to take my driveshaft out if I want to run the engine up at home Quote Link to comment Share on other sites More sharing options...
nzstato Posted October 20, 2020 Share Posted October 20, 2020 It wont fit but 1zz are getting popular for mini boats 4 Quote Link to comment Share on other sites More sharing options...
Popular Post keltik Posted October 26, 2020 Popular Post Share Posted October 26, 2020 Fits like a glove 13 2 7 Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted October 26, 2020 Share Posted October 26, 2020 In it or on it? Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 26, 2020 Author Share Posted October 26, 2020 4 hours ago, thegreatestben said: In it or on it? We are one with each other. 3 Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 26, 2020 Share Posted October 26, 2020 Cuuuute. *cough* expansion chamber *cough* 1 1 Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted October 26, 2020 Author Share Posted October 26, 2020 41 minutes ago, h4nd said: Cuuuute. *cough* expansion chamber *cough* Would an expansion chamber work on a twin with single exhaust outlet? I might remove the big exhaust block on one of the spare motors and see if it has two ports under there. Quote Link to comment Share on other sites More sharing options...
h4nd Posted October 27, 2020 Share Posted October 27, 2020 That's how the Dai is plumbed, and apparently makes a big diff to the performance. Pics of outlet? You might be able to fabricobble something up 2 Quote Link to comment Share on other sites More sharing options...
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