Engine seized up

eaglecrash2 wrote:

Mr. Kawsakiman,
Were you able to find that crank just in case? Although i yet have to split the case(family issues kept me from working on the bike), what i can see and feel thru the crankcase cylinder bore, the no. 2 connecting rod is seized to the crankshaft. The others are free to move fwd n aft except rod no. 4 which feels a little sluggish. I'd like to find a local machinist that works on small motorcycle parts.

sorry eagle, i really have not been following this thread so much as i also have family issues.
but yes, i do have a crank and just about every other part you need to get on the road again.

i kind of knew it was in the lower end but was hoping for the best.
don't worry, we'll get you going again.
it's just locked up, no holes blown in your cases.
she can be rebuilt, we have the technology.

Hi Kawsakiman, I do need your crank. I'm willing to pay for it and shipping as well. Can I pm you?

Can the secondary shaft be removed without removing the oil pump and gear? The oil pump has 2 screws and a bolt. The bolt is easy to remove but the 2 countersunk screws are punched at 2 places each to lock it in place. I think the factory don't believe in lock-tite back then. How can the screws be removed without stripping them?

Gringo, did you then replaced the 4 banger with the 750ltd engine? Did you do any mod?

pm me for a phone number and your needs.
if you promise to help another member, the cost will be next to next to nothing for you.

instead of paying me, how about you donate here so stein can keep this sight going?
( cost of shipping does not apply of course )

Of course I'll help where I can especially with more experience that i'm gaining thru all you folks. I'll be so glad to do so. Donating to this site is fine with me. I'd like to keep this site going as well. I'll pm you for the info. Thanks in advance.

eaglecrash2 wrote:

Gringo, did you then replaced the 4 banger with the 750ltd engine? Did you do any mod?

This was just a straight up replacement, I had an 81 750 LTD here that had a crank with a messed up end from a previous owner's spill. This engine I used was from an 82 750 LTD so it was a direct swap, they both were 4 bangers. Other than changing the ignition and charging systems that same engine would drop right in your bike without any mods. Just something to think about since you would gain a few ponies by going to the 750.

Let me get that straight. Yours was on a 81 750ltd, right? And you're saying a 750 engine will drop right in my 650 frame?

eaglecrash2 wrote:

Let me get that straight. Yours was on a 81 750ltd, right? And you're saying a 750 engine will drop right in my 650 frame?

Correct, the only thing different is that the 750 LTD came with an electronic ignition and since you have a 77 650 the charging system on your bike is unique to that model year. To do things the easy way you would just swap over the ignition and charging system from your 650 to the 750 engine. The only mod I can think of you will have to make has to do with the dowel pins for the 650 dyno cover are different. This just requires a bit of drilling, no big deal.

I gather the 750ltd engine is more popular(since newer) and more are available. Besides craiglist and ebay is there anywhere else that i should look for this engine? Oh what about the exhaust pipes? Are they direct bolt on as well? Sorry for all the questions. I'm weighing my options here. It seems very logical as replacement parts are probably still available in the future more so than the 650 engine?

As far as 750's go I'd have to say yes the LTD outsold the 750 E model by a pretty big margin so they are normally easier to find. You could make a GPZ engine work as well but they used an electronic tach so there is no tach drive on the cams. Not insurmountable but it would require spending more money.

Your stock exhaust will bolt up no problem as well because the 750 LTD used 6mm exhaust studs, IIRC the GPZ's used 8mm. I'd say parts availability would be about the same for both bikes. That's one of the things I like about the middleweight bikes, when it comes to finding parts they are like a small block Chevy.

Thanks Gringo, I'll start looking for a 750ltd engine somewhere. Looks to me like a good upgrade to a bike i've owned since new. I'll be passing this bike to my youngest son as he's really into it. Meanwhile him and I will continue to work on the 650 engine as a learning experience as well as having a spare around. Who knows he may want to put the original engine back. I'm trying to get a hold of kawsakiman for the crankshaft he has.