Yes, we are here!

In times like these our hobbies become lifesavers. At MOTORCYCLE CLASSICS, we have been tracking down the most interesting and rare classic motorcycles and collections for more than 15 years. That includes researching and sourcing the best books on collectible and rare bikes available anywhere. Our online store is open and we are here to answer any questions you might have. Our customer service staff is available Monday through Friday from 8a.m.-5p.m. CDT. We can be reached at 1-800-880-7567 or by email. Stay safe!

1977 Yamaha XS650D

| 8/6/2013 9:28:20 AM

Motorcycle Classics tech expert Keith Fellenstein

Editor’s note: If you’re having trouble with that old Suzuki, BSA or BMW, Keith Fellenstein is your guy. From motorcycle tuning tips to detailed motorcycle engine repair, he can draw from a wealth of experience to help guide you to success. Send questions to: Keith’s Garage, 1503 SW 42nd St., Topeka, KS 66609, or send an e-mail with “Keith’s Garage” as the subject.

Yamaha intake question

Q: I’m in the process of restoring two 1977 Yamaha XS650Ds. Upon attempting to synchronize the carburetors on one of the bikes, I noticed that there are rubber plugs or “reducers” going from the air filters to the intake. There is nothing in the Clymer service manual that shows these. My question is, what do they do and are they needed? Do I leave them in when I connect my vacuum gauges? — Ron Wandler/via email

A: I’m not sure this is the part you’re talking about, but there are intake silencers that fit inside the air cleaner elements that are specific to the D model and not found in the E and F model. Their purpose is to quiet down the intake roar. This was done to reduce the overall noise level the bike produced from intake and exhaust noise. Since they were eliminated on the models following yours you can probably remove them with no ill effect other than that satisfying sound you get when you open the throttle. If you take them both out it shouldn’t affect your synchronizing efforts. I’m guessing a previous owner of the bike that is missing them liked the intake sound without the silencers. MC

The sound and the fury: celebrate the machines that changed the world!

Motorcycle Classics JulAug 16Motorcycle Classics is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Every issue  delivers exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!

Save Even More Money with our RALLY-RATE plan!

Pay now with a credit card and take advantage of our RALLY-RATE automatic renewal savings plan. You save an additional $5.00 and get 6 issues of Motorcycle Classics for only $29.95 (USA only).

Or, Bill Me Later and I'll pay just $34.95 for a one year subscription!

Facebook Pinterest Instagram YouTube Twitter

click me