Wednesday, August 3, 2016

Time to go ULTRA

We've acquired some new equipment in the shop - an industrial ultrasonic cleaner for cleaning carburetors and other small parts. Ultrasonic cleaners use high frequency sound waves to generate microscopic bubbles in a water bath solution (it's called cavitation), and these scour the grime and dirt off, leaving clean metal behind. They are great for unclogging all the tiny holes and passageways in motorcycle carburetors.
The tricky part is finding an ultrasonic cleaner that is both tuned to the correct frequency (most are for jewelry, so their frequency is too high for industrial cleaning) and put out enough amperage to be effective (most are too weak). We were lucky to find one that meets both these requirements. Here are some of our early results:

AFTER      -    BEFORE

BEFORE
AFTER

In addition to our normal carburetor cleaning services, we will be offering the option of running your carburetor (or any other parts) through our ultrasonic cleaner. It's a good option if you want to do most of the work yourself, but also want to make sure that everything is actually clean, and all passageways are clear. We will run each carb through the cleaner, and any small parts you want to remove beforehand (such as jets, emulsion tubes, mixture screws) can be run in a separate basket. We will then blow everything out with compressed air afterwards to ensure it is clean and clear. Get in touch for pricing, thanks!

Sunday, May 22, 2016

Pre-Summer Vacation

Attention Friends! With summer rapidly approaching, we are going to sneak in a little vacation before the height of riding season, so that we can be ready for you once it finally stops raining in Pittsburgh! The shop will be closed from Monday, May 23rd until Thursday, June 2nd. We will be back wrenching on Friday, June 3rd. Feel free to email us in the meantime to schedule an appointment for our return. Thanks!

Our new garage, where all the magic happens!

Wednesday, March 9, 2016

New Location, Open For Business

After a winter of epic moving, we are all setup in our new location. And we've already managed to fill every available space with motorcycles! The shop is at 2123 Forbes Avenue, in the Uptown neighborhood of Pittsburgh. We're easy to reach from Oakland, Southside, and Downtown Pittsburgh, and blocks away from the Boulevard of the Allies. We are also easy to reach by bus (especially nice for dropping off and picking up your bike) - all the 61 and 71 buses go within a block of our shop. So, we hope to see you as the weather gets warmer!

The entrance at 2123 Forbes Avenue - here is where you drop off and pickup your bike

Inside our new work area - already overflowing with projects!

Sunday, January 10, 2016

Big News - We're Moving!

Well, after months and months of wrangling with bureaucracy, the day has finally come - we're moving our shop into the City of Pittsburgh. Our new location has a small self-contained garage that is all our own, as well as a large lot for storage.

Moving will be quite an undertaking, given the 3 years of used parts and motorcycles and parts of motorcycles that we have accumulated. Therefore the shop will be CLOSED during this process, as we get the new space ready for work.

WE WILL RE-OPEN IN OUR NEW LOCATION ON MARCH 1st, 2016
2123 Forbes Avenue, Pittsburgh, PA 15219

In the meantime, we are always available by email and often by phone. Don't hesitate to contact us for a spring appointment.

Friday, December 25, 2015

Our Favorite Two Strokes of 2015

Vintage two-stroke motorcycles are generally smokey, noisy, and terribly unreliable. A pain to work on but oh-so-fun to ride...unless you need to stop, that is. Front and rear drum brakes as standard equipment don't make for the most confident of braking. But, with very low weight and the increased horsepower of the two-stroke engine, they feel deceptively fast, and the acceleration can be a lot of fun. Here are our favorites that came in the shop this past year:

1970 Yamaha CS3 (the predecessor to the legendary RD series) - 198cc, kick and electric start, and supposedly a top speed of 80mph.

1967 Yamaha YR1 - one of the prettiest bikes we've ever had in the shop, this was a genuine cafe racer, and was designed to do the ton right out of the factory.

1973 Suzuki GT185 - definitely the smoothest-sounding vintage two-stroke we've had, very light and fast. A race between this and the CS3 would be interesting. And did you spot the Yamaha AT3 right behind it?

Thursday, June 4, 2015

CB650 SOHC Starter Clutch Removal and Installation

One of the dreaded (and unfortunately common) problems on the SOHC CB650 is failure of the starter clutch. This engine is most commonly seen in the CB650 Custom, but was also used in the 1982 CB650 Nighthawk. The symptoms start out intermittently, with the starter taking a second or two of spinning once you push the starter button before it actually engages with the motor, and will get worse over time until it doesn't engage at all - you'll hear a loud whirring as the starter spins very fast because there is no resistance, and the motor doesn't get turned, so your bike doesn't run.

According to the shop manual, repairing the starter clutch that is the source of this problem requires splitting the cases - a massive job. However, it can be done by removing quite a bit less, and keeping the engine in the frame. There are some good tutorials about this at other sites, but here are a few pictures as well to aid you in your efforts.

Basic steps:
1. Drain the oil
2. Remove clutch cover
3. Remove oil pan
4. Remove clutch basket



Here is what you should be looking at with everything necessary removed from underneath the clutch cover. Notice the primary shaft has had all the gears removed, and the bearing retainer unbolted and removed (the retainer is held in by the 10mm bolts)

Above is the primary shaft in process of removal. This may feel like it is impossible to remove at first, but lots of patient wiggling and it will eventually break free and start to slide out.

This is the primary shaft removed from the case. Free at last!

 Looking through the hole left from where the primary shaft and bearing were seated, you should be able to see the starter gear linked to the starter clutch, and the chain going up and towards the rear to link the starter itself to the primary shaft. Look for the torx-head bolts behind the holes in the starter gear. Those holes, once properly aligned, will allow you to just barely fit a torx socket onto the bolt, one at a time. Engage the transmission into top gear and turn the rear wheel to slowly move the engine and get each bolt to the "5 o'clock" position when looking through the primary gear hole.

 We found the best way to remove each bolt was using a torx socket with a 1/4" drive socket wrench, going in from the oil pan to loosen each bolt when it was in the "5 o'clock" position relative to the right engine cover. As mentioned earlier, engage the transmission and turn the rear wheel to get the starter gear holes to line up correctly to give you access to each bolt.

It can be very difficult to actually get the starter clutch to slip out past the starter gear...lots of prying with soft tools will aid your cause (wooden wedges are great). Once you have it out, spend the money to replace ALL the disposable parts - springs, caps and rollers. Consider getting a good used starter clutch housing as well if yours looks beat up. It can be surprising how little damage can cause the clutch to cease functioning.

Finally, it can be difficult to get the torx bolts into the holes once you have the starter clutch and starter gear mated and reinstalled. Again, wood blocks are your friend. Pull the starter clutch and gear apart just enough to slip the torx bolt in, but not too much so that the rollers or springs fall out. And remember, once you have the starter clutch and primary shaft back together, you can test by pushing the starter button for just a second to make sure it engages...so that you don't waste your time putting the whole bike back together and then realize you didn't do it right. Good luck!

Friday, May 29, 2015

Pop Quiz

Here are some examples of difficult to notice damage to parts that can cause big problems. Look at the photos and see if you can spot the problems with each component. Answers are below. Good luck!

EXHIBIT A
 
EXHIBIT B

EXHIBIT C

EXHIBIT D




A. See the crack on this ignition coil? That's bad...if you are still getting a spark, the coil will imminently fail. This is especially a problem on bikes with the coils mounted very close to a hot engine.


B. See the crack on the overflow tube? That caused a fuel leak that can easily be confused with a bad float valve. Sometimes they can be soldered to seal the leak, otherwise you need to replace the float bowl.

C. Did you spot all the damaged teeth in these transmission gears? There are 5 that are especially bad, and a bonus sixth tooth that is marginal. The bike sounded terrible when running and couldn't shift properly.

D. This starter clutch has been working too hard...the springs are about to break through the outside, which is what has caused the hole that accesses them from the outside to become enlarged. This represents enough damage to keep the starter from engaging the motor at al.