dt square swingarm

[Iain Cameron]

Hi guys here is a rule book ? the dt1 pre 70 needs a square swing arm , why can't I use a rt1 round swing arm its pre 70.thanks in advance Iainyz

[DR]

If it is pre'70 it is pre'70, that cannot be disputed I think the square swingarm bit was to distinguish the early legal dt1 from the later models.

[Nathan S]

You can use the round swing arm - I can't recall the exact wording: The bit about needing a square swing arm is still there, but there's also a bit about using any DT1/RT1 with a piston port barrel. This lets you use round swing arms, late frames, etc.

[firko]

Ian....you've found one of those quirky anomolies in the rulebook. Rule 18.7.4.1 states "Yamaha: AT1*,DT1,CT1* rectangular swingarm, DT1, RT1 pre reed block"The rectangular section swingarm requirement was in the rulebook long before the RT1 was declared eligible for the class as a 'flow on' and it hasn't been removed. The round section swingarm is legal. The eligibility criteria could do with a hefty tuneup but when you condider that it was developed by Peter Drakeford and his team nearly 20 years ago, it's served us well. Common sense usually prevails where anomolies occur

* A good example of the 'mistakes' in the eligibility criteria is that although the book calls for rectangular swingarms for Yamaha AT1 and CT1 models, they were never equipped with them and the DT1 arm doesn't fit.

[Iain Cameron]

Thank you all , as I have two dt1 non reed that only needed swing arms all is well as I've got two round ones thanks again

[Freakshow]

Gort a square one here, swap you for a round one if your worried ?

[Iain Cameron]

Not worried now Freaky thanks for the offer though just making shaw Im legal .

[Freakshow]

For CB 2011 youl be fine :O)