How to fit the 600 into the 3tj

[hunter]

Fack.Fack!!!!

[Pab10]

Anyhoo, this is the plate I've come up with-



The bottom holes will be tapped for the correct thread (M10x1.25).

Hi Kayla, Are you still making these steel plates?

Regards.

[hunter]

http://www.projection-racing.com/
Look in yamaha parts.

[Purpletoddy]

Just for info really but I have personally done two TC 600 conversions one into a UK 4DX frame and the other into a 3TJ frame.

On both of these bikes the TC motor will fit in with the standard modifications but the chain alignment is 5 mm off via laser alignment check. And before you ask yes the rear wheel alignment was spot on.

The reason for the above is due to the output shaft on the TC motor being longer for what ever reason, I did look at machining the output shaft spacer down but I couldn't get it out and this moves the chain closer to the cases which Im not a fan of.

no doubt if I persevered or split the cases I could have got the spacer out but that was not on the cards to be honest.

So on both bikes I have removed the lower right hand mount and moved the motor over 5 mm, made spacers etc and then welded the lower mount back on.

I can not see how anyone has managed to do a TC conversion into any of the above frames without the chain being out of alignment, it may be fine but I personally would not like to take the chance.

Just a word of caution as these are a simple conversion really but there is more to it

[Evilchicken0]

Interesting .... I wonder if it's down to the T'Cat having a wider wheel. I know the tyres are the same size but the 3TJ is a 4.5" wheel to the T'Cat's 5"

Might be quicker to space the rear sprocket

[Purpletoddy]

Interesting .... I wonder if it's down to the T'Cat having a wider wheel. I know the tyres are the same size but the 3TJ is a 4.5" wheel to the T'Cat's 5"

Might be quicker to space the rear sprocket

You may be right regarding the rear rim width its really the only explanation.

I did look at spacing out the rear sprocket but the way the carrier had a machined land to secure the sprocket as well as the nuts I didn't want to take it away from OEM, and due to it being a track bike I wanted wheels to swap over without modifying a few rear cush drives. That would have been the easy way out to be honest and have taken ten minutes on the lathe.

[Evilchicken0]

I'd have thought racers would have a few sprocket carriers to speed up sprocket changes.

Changing the output shaft, as you say would be a complete engine strip, unless you leave out those bolts accessed under the barrels

[giller72]

Just to add a spanner in the works!

I'm building a 400/600 racebike with a thundercat engine in a 3tj frame. I was fully expecting the rear sprocket to be out of alignment with the front and even drew up plans to make a 6mm spacer for the rear sprocket and new studs. However after checking the alignment with a laser I found the sprockets to be perfectly in line.

I can't understand why some thundercat conversions cause a misalignment of sprockets and other don't. I'm tempted to think I have measured/ installed something incorrectly but I can't obviously see anything I have done being incorrect?

I'm just posting out of interest really as I have found all the info in here useful

[Evilchicken0]

Oh dear the sprockets line up ... you must be devestated

[hunter]

Maybe you have a foxeye motor.