93 XP Rebuild Query???

[campinitos]

I've got a 93 XP which the piston ring has blown on and I'm going to try and tackle the repair myself - the shop has quoted £900 for the repair!!

I've got a manual, but I'm still not entirely sure on what I need to do and what I need to replace.

The ring has clearly blown on the rod, so do I need to replace the whole rod and the piston cylinder or can you just replace the ring?

Is there a kit you can buy for this does anyone know? I have no idea what parts I should be buying!

I've also heard that I should rebuild the carbs after I've sorted the piston issue and replace all the grey fuel lines while the engine is out??

For a complete novice with a book is all this possible?

Sorry for so many questions:ack:

 

[mudpie]

the problem with a top end failure is that the debris can get down into the rod/crank area and comprimise the bottom end of the engine.
you could replace the bad piston and ring, but would stand a chance of a repeat failure. on a 1993 engine it has been around for a while and has seen some use. it might be time to replace the engine assy. because the rods/crank/ crank seals/cylinder bores all could be suspect.
put the money into the top end and then have a bottom end failure and all that money is wasted.
i'd say get a rebuilt engine from sbt, get the two year warranty!!
rebuild the carbs and fuel system, tank clean and new fuel valve and lines.
verify all other systems are proper, like igntion and cooling.
mud

 

[campinitos]

Thanks Mud

I was hoping to not have to spend a lot of money on it ideally because I need to sell it - I got a bit carried away in the summer and bought another while I was trying to fix up this one!

Do you think a crank rebuild kit could do the job? I've seen them for under $200 which sounds great! My entire budget to fix up and resell is around $400.

 

[timmyboy76]

either way, pull the jugs, jam a shop-vac down there to clear the debris, if any, then order yourself a topend kit. Go thru the carbs, replace the grey fuel lines and hope she starts with no problems.

Ebay or Craigslist, you'll find something/topend that'll work, in that ballpark price.

 

[campinitos]

Thanks guys.

I've taken it all to bits now and it's clear it's one of the needle bearings that is shot. I've attached a pic.

Can you get just this part as a replacement, or should I be renewing the entire crankshaft.

I will also renew the pistons as there is some damage on the tops - see pic.

Cheers TimmyBoy - so a top end kit seems a certainty, but just not sure about what to do with the crank?

Should I be soaking the parts in anything to clean them out at all?

And when you say go through the carbs - what do you mean? Just clean them?

Cheers guys

 

[seadoosnipe]

UK and SBT...?

Thanks guys.

I've taken it all to bits now and it's clear it's one of the needle bearings that is shot. I've attached a pic.

Can you get just this part as a replacement, or should I be renewing the entire crankshaft.

I will also renew the pistons as there is some damage on the tops - see pic.

Cheers TimmyBoy - so a top end kit seems a certainty, but just not sure about what to do with the crank?

Should I be soaking the parts in anything to clean them out at all?

And when you say go through the carbs - what do you mean? Just clean them?

Cheers guys

In this situation, I'd like to say it's about time for a new motor. But, you live in the U.K. That's a different story.

I think, timmyboy has an idea, though I don't know the shop vac is the solution.

I think, at minimum, the casing needs to be split and everything cleaned and inspected. I use one of those magnifying glasses that's attached to my work bench. It's set up to swivel where I need it and has a light. I use this propbably more than any tool in my shop.

There used to be an old saying, "if it works, don't screw with it". You could clean everything, replace your failed parts, measure your remaining parts for tolerance and do the upper end. As long as everything mics out o.k., you may be o.k....... BUT:

I would have to caution you. Mudpie has made a good point. This engine is old. The part that failed could be a precursor to the integrity of your motor beginning to decline. Which means, how long before something else fails.

I know, shipping in a new SBT motor is almost the cost of a new ski over there. Danged tariffs you guys have will break you. You might look at using a local machine shop and ordering parts verses the complete engine.

We have a member from the U.K. who was a moderator a few years back. For reasons of his own, he decided he couldn't invest the time as a mod anymore but he still participates in the forum. He's a guy you can trust to help you decide on the best way to get the parts you need. He may even have some local parts suppliers he can give you. His name is Dave but his username is D 5UPE.
Send him a PM, see what he has to say. He won't steer you wrong.:cheers: