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Discussion Starter #1
hey guys, see my post in the new members section about how stupid i am or just read on.
so heres the deal. I bought a 72 gt380 about a week ago and just got finished with all the paperwork for it and the daunting task of getting it registered in my name which brings me to now- its been 3 days since i took it out for its first hwy ride and one day since i blew it up.
basically the po told me the 2 cycle oil tank was recently filled. i was dumb enough to not check it since the bike was new to me and i didnt know anything about bleeding the oil lines i thought id leave the wrenching for another day and just try to enjoy the bike for a few days.
center piston is destroyed along with the center connecting rod, the center cylinder and a load of piston srap in the bottom case.
20140215_163708[1].jpg 20140303_161412[1].jpg 20140303_161453[1].jpg 20140303_161341[1].jpg 20140303_161400[1].jpg what i need is a new crankshaft seeing as no one in the whole state of texas has the appropriate tools to fix my current crankshaft. or a reputable shop somewhere off in the world that i can send mine to, to be rebuilt. or am i screwed and need to find a new engine? lets just say im not working with a huge budget so the most cost effective way would probly be the best. also since i already have the thing apart and know that it was running great before this mishap, i was thinking it would be cool to bore the jugs and get some new pistons, basically have a new engine when im all done.

any advice on how to come back from completely ruining a two stroke engine would be helpful and appreciated and dont forget to make fun of me for my dumb mistake as i know most of you love to give a hard time.
 

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cruzinimage_co | eBay........... has piston/ring sets .. standard ,.5 and 1.0 mm over. $60 plus ship.. I have them in my s3.they run fine . ive heard other positive things too. power seal in pa for machine/boring work.. on your way
 

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Discussion Starter #5
tempting but im sure it would take forever just to find the parts to complete that. first time id ever heard of a sparton, pretty awesome.
 

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I won't get your hopes up and say any of it is useful but I have a GT380 engine that has been kicking around my garage for a long time. I can check and see if the crank is usable. Cylinders may be usable with a hone. If you end up not being able to find anything let me know.
 

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As long as there isn't a crack where it looks like the rod hit the lower case, and the bearing jornals aren't destroyed, I think your cases are fine.

I find it hard to believe there isn't a whole shop in the state of texas that can help you. I just think you aren't asking the right people. There have to be two stroke shops in texas and every two stroke shop should have the "tools" to do a service crank rebuild. I have heard good things about the crank shop in vt, they can probably rebuild your crankshaft:
- The Crank Shop Vermont Specializing in Ski Doo Performance Aftermarket Products

To be fair, it probably isn't worth it to rebuild your GT380. It isn't in all that great of shape to being with and you are looking at a grand in machine work and parts to get you back on the road. I would just try to find a complete GT380 motor with good compression and crank seals and stab that in your bike instead - it will be cheaper.
 

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I still think buying another engine will be cheaper in the long run than repairing what you got... engines available on ebay for a few hundred dollars...
 

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I'd have to echo what others have said - see if you can find another engine or at least a good crank to rebuild. I doubt the con-rods are available any longer. If the VIN on the cases matches the frame VIN it may be worth reusing the stock cases. They don't look too badly damaged in the pictures.

For crank rebuilds - there's Bill Bune: Bill Bune Enterprises-Anoka Minnesota-motorcycle, snowmobile, atv & watercraft

and Wisconsin Recreational Crankshaft: Wisconsin Recreational South Range, WI, 54874 - YP.com

Since you are in Texas I imagine you don't have a strong snowmobile industry where you would find folks that can rebuild a crankshaft. Maybe some of the water powersports shops know of someone?

If you do have to ship your crank for rebuild, I've had good success sending them packed in plastic tool boxes. Well padded on the inside and reinforced with packing tape on the outside. Plus the mailman appreciates the handle.
 

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Ask Micah at AF1 about crank rebuilders. We send ours to Bill Bune and any used motor will need a crank rebuild and new seals. Sundial is the place to go for guys with 380s. Someone there may know of a replacement rod. That motor is just a GT250 plus an extra cylinder and somewhere on line there's all sorts of cross references. If you can get a set of oversize pistons from Cuizinimage, grab them. They are cheap and reasonable quality.
 

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Discussion Starter #11
thanks for all the input yall, i appreciate it. about the crank, i asked chris from limey bikes here in austin and i firmly trust what he says ( he has guided me through my first few clueless years of vintage bikes and never given me bad advice, most of the time was able to help me fix my bike over the phone.)also id rather send it off to someone i know will do a good job than send it to someone if found "can do it". i went through a cb350 and loved it. i ended up selling it to a guy who im sure enjoyed it mostly for the look and probly had no idea what hagon shocks were much less the boretech ignition or why the footpegs were so far back.

but now im on the 380 and allthough it doesnt look like much and it is mostly a stocker, i love it, i like the two stroke aspect, the engine is supremely easy to work on compared to the cb or the kz750 i had for a bit. i guess i just love bikes that handle like garbage haha. but anyway i killed this bike and id like to bring it back that is all.

the engine was in good shape given its age, i gues one of the po's had rebuilt it already being that its so clean inside and there is make your own gasket goup all inbetween the cases. which i realized is why the middle cylinder never ran as good as it should have (small leak from inbetween cases near center cylinder)

the only thing i would be worried about with just getting a new engine is the crank. at their age, none of the cranks i find will really be in tip top shape and since i plan for the 380 to be my daily rider/slowly add parts here and there (suspension, elec ignition and such) i feel like i might as well make whatever i can fresh again.

so getting down to it. yes i will probly spend a grand on this and hopefully i can have it going by mid summer and will be more than satisfied with that. i dont have a second bike and i dont make a lot of money so i am just weighing my options. im stuck between just having something to ride and figuring while im here i might as well....
thanks TSwami ill send a pm about that crank. i think just the center cylinder since the other two are still good enough to throw pistons into, i will probly try to get that and the crank and have someone fix the bottom case, hone the cylinders, grab some pistons and rings and go with it. well see what happens.
 

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If you are planning on the 380 being a daily driver amd project bike, then you need to get at least one more complete parts bike. You can then take the complete motor from it and use it while you rebuild the other motor. Ideally you should have three or four parts bikes and build up a second bike while you ride the stocker. Then ride the second bike while you then build the stocker to the next phase.
 

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Discussion Starter #13
i agree, ive actually been looking on craigslist for a couple hours but havnt seen much, i also messaged the guy with the gt380 engine on ebay twice in the last 2 days and got nothing back.
 

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Discussion Starter #14
just to be teased by an overzealous wife trying to get rid of her husbands 75 cb400 four ss for $500, someone got the pot of gold before i could make it to the leprechaun. and there is no gt380 or parts for one in this state. besides 1 super nice one.
looks like looking for a new bike while i find the parts for this one is whats gonna happen.
 

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If you have measurements for rod I may have one (or forging numbers?)
I can also re-build crank although I haven't done a Suzuki triple since about 1986
 

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I think you mean true it, balance is set at factory. Truing isn't actually too difficult
 

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Discussion Starter #18
my bad. still learning. what kinda price are we taking here?
i would need to order new bearings and seals too i suppose.
 

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Yep, I'm not sure what rods I have all together so anything that you want changed, source first.
I'll pm you, may come up in notifications (top right)
 
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