Geoff Posted August 21, 2014 Share Posted August 21, 2014 The out board is a 2002 model. I'm not too sure how many hours it's done. There's no meter. I'll ask my mechanic when I bring it in and post up results on the findings. Interesting , Are you sure it's a 2002 model. My 70 2S is a 2003 model, has the automatic oil injection & a full set of gauges which tell everything one needs to know , eg temp , oil, speed , battery voltage , hours , trim & a few other items. Can not quite understand a model one year earlier is so different Are you still planning to take the boat to Blacktown?? If so suggest you ask about installing a full set (2) of Yamaha multi functional gauges . In respect to the temp problem determing the water flow when on the ear muffs can give you a faulse result. The only way to obtain an indication of the flow from the tell tail is when the motor is in the warter. Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Hi Geof,yeh I believe its correct. Here's an image of the outboard. I believe the gauges just weren't installed. Though now I'm curious why it doesn't have oil injection. The guages I have are speed, battery voltage, rpms and fuel. Link to comment Share on other sites More sharing options...
Geoff Posted August 21, 2014 Share Posted August 21, 2014 The guages I have are speed, battery voltage, rpms and fuel. I've just had a look on the Yammie web site & the photo of the current motor is the same as yours so the age appears correct , the mystery is why it has no auto oil injection. The limited gauges may have been a cost issue with the origional purchase but today they are standard equipment. If you decide to spend some $$$ to up grade here is what you get, digitial gauges containing , Taco (RPM) , water temp alarm , low oil alarm (not applicable with premix) , speed (option for MPH / KPH / Knots)i , battery voltage , low battery alarm , total hours , trim , trip meter , time , fuel leval. So , perhaps a bit more to consider after you address your immediate problem & the boat goes in for the water pump change Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Thanks Geoff. Those digital gauges are quite some big $$$. Its something I'll have to think about. I'm planning to upgrade to 4 stroke in a few years. Link to comment Share on other sites More sharing options...
Geoff Posted August 21, 2014 Share Posted August 21, 2014 Thanks Geoff. Those digital gauges are quite some big $$$. Its something I'll have to think about. I'm planning to upgrade to 4 stroke in a few years. I've just had a look on the web. OMG !!! I can see what you mean about big $$$. The prices for something Yamaha produce in the hundreds or perhaps thousands for most likely a few $$$ each are out rageous.. Whilst nice to have , the price V's the benifit is just not justified , especially if your considering an up grade. Cross that off the "to do" list. Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Yeh pretty shocking. Unjustified. It would probably b better to buy the lowrance control unit and hook it up to my fishfinder. Link to comment Share on other sites More sharing options...
Guest Aussie007 Posted August 21, 2014 Share Posted August 21, 2014 sorry mate i should have finished off my last post, since my mates engine is running rich because of the thermostat being stuck open it fouled 1 of the plugs causing the engine to run rough and jumped around Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Ohhhh that's interesting. I took a look at my plugs and one of them looked a little fouled up. I cleaned them up though .. In hindsight I probably should've left it so the mechanic can better diagnose. My boat isn't going to be looked at till next thur. Will keep everyone posted for future reference. In the meantime, I'm going to try reproduce and test the electricals out. This is an awesome forum. So much good info and help! Link to comment Share on other sites More sharing options...
Geoff Posted August 21, 2014 Share Posted August 21, 2014 (edited) Ohhhh that's interesting. I took a look at my plugs and one of them looked a little fouled up. Which plug was it ,the lower plug on the port side bank ? If so , there is a specific reason but will wait for your reply before I throw another possible aspect into the mix Geoff Edited August 21, 2014 by Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Yep that's the one. Lower side port side .. Looked a lot more oily than the others Link to comment Share on other sites More sharing options...
Geoff Posted August 21, 2014 Share Posted August 21, 2014 (edited) Yep that's the one. Lower side port side .. Looked a lot more oily than the others The mechanical fuel pump , also on the Port side , is opperated by that piston. Inside the pump is a rubber diaphram which moves in & out as the piston moves. Over time hair line cracks appear in the diaphram which allows fuel to be pumped directly into the cylinder thereby causing flooding , plug fouling which inturn drops you down to 3 cylinders & rough running. To check this , remove the fuel pump then diaphram. This is not a difficult job. Hold the diaphram up to the light & if there are cracks light comes through. Replace the diaphram & you rough problem will be fixed. Geoff Edited August 22, 2014 by Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 21, 2014 Author Share Posted August 21, 2014 Thanks Geoff ! I'll have a look this weekend. Lucky I have the service manual Link to comment Share on other sites More sharing options...
Geoff Posted August 22, 2014 Share Posted August 22, 2014 Thanks Geoff ! I'll have a look this weekend. Lucky I have the service manual By all means check the manual but from memory the job is quite simple. Remove the in & out fuel lines , undo the bolts holding the pump onto the motor & remove the pump. I think there is only 2 parts, the diaphram & a small spring. Just be carefull when removing the diaphram as the spring may go flying off & lost. Geoff Link to comment Share on other sites More sharing options...
VViCKiD Posted August 29, 2014 Author Share Posted August 29, 2014 So I got the boat back today and it turns out an aftermarket impeller was fitted incorrectly. So the outboard was overheating only when at low revs. Problem solved! Checked the diaphragm and it was all good. Massive thanks for everyone's contribution to this thread! Link to comment Share on other sites More sharing options...
Guest Aussie007 Posted August 29, 2014 Share Posted August 29, 2014 did u find out what was causing the shaking? Link to comment Share on other sites More sharing options...
VViCKiD Posted August 29, 2014 Author Share Posted August 29, 2014 Yeh the shaking was from the overheating Link to comment Share on other sites More sharing options...
spaners Posted August 29, 2014 Share Posted August 29, 2014 As I said,don't use after market impellers,its false economy. Link to comment Share on other sites More sharing options...
VViCKiD Posted August 29, 2014 Author Share Posted August 29, 2014 Agreed .. Was the first time the impeller was looked at.. But everyone should definitely avoid them Link to comment Share on other sites More sharing options...
harold Posted September 11, 2014 Share Posted September 11, 2014 Just had our gen set serviced and that involves changing the impeller and that was about. $550. We have to do that every 100 hours which is very easy to rack up in 3 months in winter. Link to comment Share on other sites More sharing options...
batfishing Posted September 11, 2014 Share Posted September 11, 2014 Just had our gen set serviced and that involves changing the impeller and that was about. $550. We have to do that every 100 hours which is very easy to rack up in 3 months in winter. Wow, that seems excessive for the impeller, is that the complete genny service or just the water pump? It's less than an hours job and the impellers about $40. That's on my 5kva Kohler Sent from my iPad using Tapatalk HD Link to comment Share on other sites More sharing options...
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