Restoration of a Yamaha TR2 1969 350

19 Мар 2015 | Author: | Комментарии к записи Restoration of a Yamaha TR2 1969 350 отключены
Yamaha TR2

Restoration of a 1969 Yamaha TR2 350

a classic racer to its former can be a labor of love, but the end result is worth the effort.

1. Early Racers

Image courtesy of Keenan

The late 60s saw major in the world of international motorcycle The established teams from with their high 4-strokes, suddenly found machines were no match for the 2-strokes. Leader amongst the manufacturers to offer a competitively high performance kit, complete bikes, was the Yamaha company.

By the end of the 60s, any serious in the 250, 350 and occasionally 500-cc had to have a Yamaha. The 350-cc in particular was becoming dominated by the TR2 So fast were the TR2s with some overboring, could be raced in the 500-cc and be highly competitive.

Today, the Yamaha machines the 60s, 70s and 80s are highly sought for classic and vintage racing the world. The majority of parts are available for these machines being based on a relatively street bike design, are either easy to produce or to

2. Restoration, Disassembly

Image of: Davey Keenan

Australian Keenan is an avid classic racer. He is a familiar face on the under racing scene he has campaigned a TD2 Yamaha since it was

Looking to add a 350-cc machine to his Davey purchased a TR2 from a in 2000. The bike was in poor when he got it. I really think people would have it, but to me, and a Yamaha restorer, no such said Davey.

A number of parts were including the front forks and the and its associated brackets. The frame had modified from stock the rear shock mounts lower on the frame.

During the any non-original parts were In addition, some welding and was required as the frame had been to accept a different motor. aluminium welding was also on the crankcases as they showed of damage from a broken

3. Parts and Specs.

Image of Davey Keenan

Over the years Davey had a number of parts in readiness for the These included:

New cylinders hard chrome bore


Connecting rods and pins

Gearbox selector and mechanism

Clutch plates

Yamaha TR2

ignition unit (most of the time replaced the original points ignition systems for fully electronic types )

The carburettors (34-mm bore) re-jetted with a 340 main a primary jet of #50, and an air jet of 22.5. The cutaway was a #3.0.

The ignition was set at 1.8-mm BTDC which is a starting point for this of engine. (Note: experienced of the time would typically the ignition timing to suit the For example they may set it to 2.1 BTDC for a twisty track, and 1.5 BTDC for a track with long However, the ignition timing and must be altered together to seizures).

4. Painting and Final Assembly

courtesy of Davey Keenan

consisted of repainting the frame, clamps and swing arm black (as per the Yamaha scheme), and the fairing, and front fender to white and to replicate the original Yamaha The faring painting took time due to the red line along the as Davey explains: It took a bit of that red sweep from the of the fairing nose down the side. You have to get it spot on if you don’t, it looks strange.

Assembly started with the swing arm, triple and head-stock bearings (followed by the forks) and the wheels. However, the had been rebuilt using new and the aluminium hubs and brake highly polished.

The front on these early Yamahas is the leading shoe type. these brakes are relatively and suffer from the gyroscopic when changing direction are considered to be some of the best ever made for pure power. However, many are nervous of these brakes of the technicalities of setting them up.

In these brakes are no more than a twin leading brake, it is just that are two of them in one wheel assembly.

The engine was fully rebuilt the new parts — as previously — plus new seals and throughout.

5. Never Started

courtesy of Davey Keenan

Yamaha TR2
Yamaha TR2
Yamaha TR2
Yamaha TR2
Yamaha TR2
Yamaha TR2


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