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1981 Yamaha Seca Purchase Advice

269 Views 2 Replies 2 Participants Last post by  Strange Specimen
Hi all!

I have the opportunity to buy a 1981 Yamaha Seca XJ750, but am wondering if it is actually worth its 1900 dollar asking price.

About the bike:
It has 17000 original miles because it was found poorly neglected in a barn. After being purchased by the current owner, it was restored to working condition. The front end was rebuilt, all fluids bled, calipers rebuilt, fork seals replaced, repainted, exhaust system replaced, carbs cleaned and rebuilt, it idled well after warming up, and all critical systems are in working condition. The owner does bike restorations as a hobby, he probably had 4 or 5 other bikes of similar age that he was in various stages of restoring. Both him, his wife, and his kids all ride and have ridden for many years. I had the opportunity to ride the bike and loved how it handled and its power delivery, as well as the crispness of the shifting and throttle.

The bad:
The front brakes are "numb" as the owner described himself. The lever is equally stiff during the entirety of the pull and it is very difficult to tell when it actually starts engaging the caliper to the disc. This may be due to the fact that the master cylinder is located underneath the instrument cluster and so there is a short cable (not a hydraulic line) that connects the cylinder and the brake lever. If this is dirty or stuff from sitting, I can see how that could cause the numbness I felt.

The tank had some rust. Not nearly as bad as many others, but it was present.

The engine sounded off to me. It may have been simply that as an older bike and a different engine it sounded different (I have had this experience with cars before), but I thought I could detect something of a tick. Unfortunately I did not have the foresight to record audio or anything.

It made a grinding noise when shifting into first once out of maybe 3 times I shifted down while stopped, and did the same into second every time I tried while it was stopped. Once the bike was moving it shifted crisply.

It seems to still like first gear over second until about 12 mph, which is odd to me but may simply be something I need to get used to on an older and different bike.

I could not feel the clutch engage as easily as I could in other bikes. This once again may be due to a dirty or stiff cable that just needs lubricated or replaced.

Overall, I have a very difficult time not trusting the owner and loving the bike. He seems extremely knowledgeable about the bike and motorcycles in general, and the bike is very comfortable and appears to be in great condition especially considering its age. Everything I've read suggests that these bikes are incredibly relaible, I just don't know the extent that these problems matter or will cost to fix, or are even problems at all. Any insights would be appreciated!
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It's a gorgeous bike!

A couple of questions (which I do not intend to be condescending in any way, it's just something to take into account when buying older machines): Have you previously owned an older bike? Do you plan on working on it yourself?

I ask because there are definite upsides and downsides to having a vintage motorcycle. As an upside, they don't tend to lose value, usually the opposite, and even if you run into problems down the road, you could likely sell it for most of what you paid for up front even in a non-running condition (bar any major issues). But they do have real running costs!

In my experience, you can't expect an older bike to brake as well as a modern one, though it sounds like it's still underperforming. I would absolutely replace any cables on a bike that has been sitting that long, especially those in a braking system! Moisture can make its way into the housing and corrode the cable. A new quality clutch cable does wonders, so can an eye on good cable routing to soften hard bends.

A tank with rust will need attention eventually.. In the very least it needs a fuel filter (if it doesn't already have one) because it's only a matter of time before rust particles make their way into one of your four (!) carburetors and start causing issues.

I would compare this price to what you see on the market for this model in a range of conditions. I would also make sure I can find some good resources for this bike if you plan to be hands-on, both in terms of more bike-specific forums, manuals, and retailers to buy parts from. In my experience, it's unreasonable to think that it won't need some kind of work down the line, apart from the usual maintenance. Also search forums for common/known issues!!

Anyhow, back to the start.. First two questions are important.
See less See more
It's a gorgeous bike!

A couple of questions (which I do not intend to be condescending in any way, it's just something to take into account when buying older machines): Have you previously owned an older bike? Do you plan on working on it yourself?

I ask because there are definite upsides and downsides to having a vintage motorcycle. As an upside, they don't tend to lose value, usually the opposite, and even if you run into problems down the road, you could likely sell it for most of what you paid for up front even in a non-running condition (bar any major issues). But they do have real running costs!

In my experience, you can't expect an older bike to brake as well as a modern one, though it sounds like it's still underperforming. I would absolutely replace any cables on a bike that has been sitting that long, especially those in a braking system! Moisture can make its way into the housing and corrode the cable. A new quality clutch cable does wonders, so can an eye on good cable routing to soften hard bends.

A tank with rust will need attention eventually.. In the very least it needs a fuel filter (if it doesn't already have one) because it's only a matter of time before rust particles make their way into one of your four (!) carburetors and start causing issues.

I would compare this price to what you see on the market for this model in a range of conditions. I would also make sure I can find some good resources for this bike if you plan to be hands-on, both in terms of more bike-specific forums, manuals, and retailers to buy parts from. In my experience, it's unreasonable to think that it won't need some kind of work down the line, apart from the usual maintenance. Also search forums for common/known issues!!

Anyhow, back to the start.. First two questions are important.
Yes, this will be my first time owning vintage bike, and I plan on doing all the work I can on my own. Thanks for the suggestions! I will definitely be doing some research.
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