Walneck's Classic Cycle Trader - January 2008 - (Page 29)

MONTHLY FEATURE STORIES additives for the fuel? The bike has never been restored and the motor never rebuilt. Thanks again for your time. John Via e-mail I’d recommend running the 20W50 oil, particularly if the bike is going to be ridden hard, but a 10W40 will probably work just as well and will make the engine a little easier to kickstart, especially on cold mornings. Yes, synthetic is a good idea, but only if you plan to extend the oil changes, if you’re going to be changing the oil every time the bike is ridden or even every 1,000 miles using a synthetic oil will be more expensive than it’s worth. I don’t like to recommend specific oils, in part because there are so many good ones out there that it’s hard to pick one that’s significantly better than the others. That being said you can’t go wrong with Golden Spectro or Maxima, mainly because they are both excellent oils and universally available, at least in motorcycle shops. Lastly there’s no need to use any sort of lead additive, the TT comes from the factory with hardened valve seats so valve recession shouldn’t be a problem. BENCH RACING recommended .006 to .010 of an inch and adjust the cable so that the pointer lines up with the guide pin at WFO. The other thing I’d recommend checking is the transmission side crank seal. If the tranny seal is leaking, transmission oil will be forced into the crankcase, and contaminate the fuel mix, rapidly fouling the plug. The easiest way to check the seal, short of replacing it and crossing your fingers is to watch the tranny oil level. If it drops, and there’s no external leak, your seal is leaking. As to premix, if you’re bound and determined to go that way use the oil manufactures guide, which will probably be between 30 and 50 to one. Since it is a trials bike -all things being equal I’d probably go leaner rather than richer. Lastly as to why the plugs won’t throw a spark, chances are you’re just not getting them clean, try glass beading then and then soaking them over night in lacquer thinner, before giving them a good blow dry. am not sure what ratio I would use. Can you please advise me on ratios, what would be a good oil to use and why those plugs (NGK B7ES, manual recommended) become totally useless? Thanks again John Via e-mail Generally when oil pumps fail they don’t pump enough oil. If it’s pumping too much my guess is that either the adjustment is off, or you have other problems. The first thing you should do is revisit the pump adjustment. Start by setting the pump stroke as detailed in your manual. Back in the day I’d set the pump idle stroke at nil, my feeling being that the bikes had plenty of residual oil in the crankcase so at idle they didn’t need any more. I’d adjust the wide-open position to the factory recommendation. However since I’m not able to ride or examine your bike I’m going to tell you to set the stroke at the factory A A Send your questions, comments And poison pen letters to Mark Zimmerman at John 2 Hello again Mark, I am having some problems with a 1974 Yamaha TY 250A. It seems that the Autolube pump puts too much oil into the motor and I can’t adjust it down any further. The plugs get oil fouled and even after I clean them they just won’t spark again. I’m thinking that I should do away with the oil pump and go premix, but I Q Zimmemr@aol.com BENCH RACING QUESTION WALNECKS.COM I WALNECK’S CLASSIC CYCLE TRADER® I JANUARY 2008 29 http://WALNECKS.COM

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Walneck's Classic Cycle Trader - January 2008 Contents Message from Heidi Boe, General Manager American How to Use the eBook - See The Buzz The Buzz w/ Buzz Walneck Bench Racing w/ Mark Zimmerman Mid America Auction’s Ron Christenson Biker of The Month Tip of The Month 1971 Harley Davidson Baja 100 3rd Annual Barber Vintage Festival Recap Event Listings & Advertisements British 1956 BSA Goldstar 500 European 1975 Ducati 860 GT Rhinebeck National Antique Motorcycle Show & Swap Meet Recap Japanese 1966 Yamaha YM-305 Competition Motorbikes & Scooters Antique Cycle Clubs Antique Cycle Club Listings Parts, Accessories, Want Ads How to Place a Word Ad How to Place a Photo Ad Area Code Directory How to Subscribe

Walneck's Classic Cycle Trader - January 2008

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