HX Not Starting

[mrwolf]

Hi Guys

I saw a thread in the how to section and was wondering if you guys could help.

I have a 1995 Seadoo HX which has big problems starting.

THe ski wont start either warm or cold without alot of cranking / choke etc, i find that once it starts if i can jump on and take off it will generally run and go pretty well until i stop and then it will either stall or when you hit the throttle again it will stall.

The compression of both cyclinders are 120, it does still have the grey fuel lines, which i will be replacing over the weekend and trying that.

Is 120 too low compression and could this be causing the starting issue, or do you think it is definatley a fuel problem?

Thanks
Matt

 

[Mr Africa]

Hi Bud

120psi isn't the greatest but not bad either 90-100 is getting low and would need a rebuild. As both cylinders are the same that shouldn't be a problem.
( no magic oil or anything throne down the cylinders)

Your grey fuel lines I would say is most likely your problem. Change all grey lines then carb, clean and rebuild to be on the safe side. Check all filters and fuel select valve.

If you search the threads you will get some great advise on how to do it.
One word of advise. Remove, measure and replace fuel pipes one at a time so that you know where every pipes go's.

Hope all works out.

 

[Dr Honda]

Well... not to disagree with Mr. Africa... but 120 is too low for a seadoo engine. Yes the engine will run, but it won't make much power, and it will start eating it self in short order. It's time to freshen up the top end.

Here's the deal. The spec for the engine is 150 psi. So, when you get much below 130 psi, you are loosing too much cyl pressure to ring blow-by. When the engine is running, and all those hot, corrosive combustion gases are pushing past the rings... it will overheat the piston skirts, and displace the oil. In turn, you will loose crank bearings, and melt the pistons. Right now... you could replace the pistons and rings, and have a great running engine. But if you don't do it now... your next trip out could be a total melt down. When that happens, you are looking at +$800 for a total rebuild.


OK... yes there are other engine out there that will run perfect at 120 psi (like Polaris watercraft) but they were designed to run at that cyl pressure. In the case of a Polaris engine... 95 to 100 psi is getting low. The real story here is that yes, the engine will run at 120, but once you deviate too far from the spec... you are causing damage.

 

[Mr Africa]

Hi Tony
No worries about disagreeing.

I read a couple times and the person said that 90-100psi is getting low and they then went on to explain how to check compression and that both jugs should be close to reading the same and so forth.

I am no expert so I would rather listen to you.

From
Andrew H