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Ducati TT1 Replica

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posted by Steve Munro alias loudbike on Wednesday 25th of September 2013 07:04:10 PM

With 88 rear wheel horsepower in a sub-300lb package, this example is arguably the quickest and best handling old-school 750cc TT1 in North America. I built this TT1 using period components as a relatively faithful replica of the TT1s that ran in the AMA BOTT GP class back in the day. The only deviation being the modern (90s) calipers and pumps, ignition coils and the non standard crankcase breather box in the seat. However, it differs from most TT1 replicas in that it was built to be a fast and reliable track bike. Over the years I’ve found that the only TT1 frame that seems to work well with modern 17” wheels & slicks is the final series Verlicchi large diameter, thin wall. Back in the day, Reno Leoni had DM Frames make a copy of the Verlicchi and DM has since modified the jig to allow for the use of a big block motor. The DM version was checked digitally last year against the Verlicchi and they are geometrically identical, however the DM is 12mm longer between the upper cross brace and the steering head. I countered this somewhat with the offset on my triple clamps, but the small difference in trail gives the DM a bit more stability with a very small decrease in agility. The whole thing is held together with over $900 in titanium and aluminum fasteners. Every bearing and seal in the motor and on the machine is new. The bike is a highly-developed example of an old-school TT1 – works brilliantly on the track and handles better than any TT1 I’ve ridden. The bike and motor were built with care and a high level of attention to detail over an 18 month period. It was broken in correctly on the dyno and then saw six horsepower/tuning pulls and roughly 4.5 hours of track time. I’ve run the bike at Calabogie and Mosport – and came away delighted with the performance and handling on both occasions. The specs are: DM TT1 Frame Marvic 3-spoke magnesium wheels with floating 280mm Brembo rotors front and 260mm rear Brembo P3034 calipers with authentic Brembo racing caliper adapters Brembo 996 series pumps Authentic TT1 Brembo rear master Marzocchi M1R forks substantially modified by Lindeman engineering back in the day (they work like no M1R I’ve ever experienced) Authentic TT1 Marzocchi 195mm triple clamps TZ replica throttle Scitsu tacho 851 clip-ons (Verlicchi) Authentic NCR electrics plate Bosch ignition (rewired pick-ups) with Dyna 3 ohm coils Custom-built Stadium shock (rebound plus Hi & Lo speed compression adjustment) 750 F1 aluminum swing arm Leoncinni TT1 Replica floating rear brake caliper mount Leoncinni TT1 Replica rear sets Old Racing Spares endurance tank and TT1 seat with custom, integrated breather box Bimota DB1R fender & mount Romanelli TT1 fairing loudbike open NCR replica exhaust loudbike 85db Weber exhaust 750 Sport-based bottom end built by Gary Palmer 800SS rods Lightened clutch basket, clutch housing, primaries and flywheel JPrecision heads with new valves, guides & seats and NCR #7 cams with STM adjustable pulleys Modified F1B pistons (12.5:1 compression) Mikuni TM Pro-series 41mm flat slides Mikuni vacuum fuel pump Modified Old Racing Spares cam end covers Oil cooler with Starlite hoses, Earls fittings and top-end lubrication via cam end cover feed Magnesium rocker covers Dyno-tuned to 88hp, 56ftlbs torque The fiberglass fairing is a period piece, so there are some minor surface cracks already starting to show. As well, there is some minor paint blistering (two quarter sized areas) from heat off the 95bd exhaust. You can see the dyno runs at www.youtube.com/watch?v=h6lMRYyqrz4&feature=share&amp... www.youtube.com/watch?v=-mt_-oKAIMs&feature=share&amp... You can read about the progress of the build on my blog at: loudbike.blogs.com/loud_bike/2013/07/back-in-the-saddle.html loudbike.blogs.com/loud_bike/2012/09/4th-annual-ducati-tt... loudbike.blogs.com/loud_bike/2012/05/ducati-750-tt1-and-b... loudbike.blogs.com/loud_bike/2011/12/winter-2011-loudbike... www.loudbike.com



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