The RD400 drag bike

[neil]

I'm booked for Saturday, Al, Tony if you want to stay over let me know. I'm about 25 miles from Elvington

[tony.mon]

I'm booked for Saturday, Al, Tony if you want to stay over let me know. I'm about 25 miles from Elvington

That's a kind offer, thanks.
Wife is probably joining me, and the journey from Kent is only about two hours so I'll think about travel nearer the time and let you know.

Anyone know what time sign-on starts and finishes?

[AMCQ46]

I'm booked for Saturday, Al, Tony if you want to stay over let me know. I'm about 25 miles from Elvington

Hi Neil, do you mean Saturday? The rwyb is on the Sunday

Thanks for the offer of an overnight stop, but I am out to see a band on the Saturday night, so will have to do an early start to get to the Pod for 8am scruitinering

[neil]

Back home now so can reply. Wifi I was using when away wouldnt accept replies, it was blacklisted.? I thought you'd booked for the Straightliners show in February not the RWYB. Crossed wires due to timing of earlier replies

[AMCQ46]

Chaingaurd is required as part of the regulations for the straightliners organised drag events.

Looking at the one on my firestorm, i thought it could be a good starting point to fit the RDs braced and extended swing arm, so I contacted Frank & Mac inc, and got a spare one.

Some Dremel cuts a taped hole, 2 rivnuts and 3 Aldi steel brackets later its is done.

Happy with that

[Duffy1964]

Tidy job Al


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[fabiostar]

That looks the very job

[sirch345]

Another Firestorm part on this bike, what’s not to like

Chris

[fabiostar]

Another Firestorm part on this bike, what’s not to like

Chris

i strangly kinda have a firestorm part on my LC . i didnt realise until i went to replace the chain on it, the storm and LC use the exact same chain . what the hell did yamaha think a 250 would do to a dirty great 530 chain

[sirch345]

Another Firestorm part on this bike, what’s not to like

Chris

i strangly kinda have a firestorm part on my LC . i didnt realise until i went to replace the chain on it, the storm and LC use the exact same chain . what the hell did yamaha think a 250 would do to a dirty great 530 chain

Well I never, not what you would be expecting I'm sure

Chris.

[AMCQ46]

Well that’s a huge step backwards!

With the 1st drag outing less than a month away, I thought i would start her up, get her up to temperature and make sure all the basics are still working.

After wam up, did a couple of hard starts from about 3 to 4000 revs just to see it it wheelies or spins (it spins) and then the engine note changed with a new metallic sound from the left hand pot.

Back on the bench and took the L/h head off to see some metallic particles in the combustion chamber

Debris in head

Further strip down to find the back of the piston has broken up

Failed piston

So now I need to split the engine to get the rest of the bits out and also the joy of tracking down a 40yr old piston which may or may not be from a DT175.

The engines out and on the bench and I have spent hours on the internet tracking down Yamaha pistons that are marked like this one

Piston number

No engine

On the bench

Let’s see how far get before the deadline of April 7th

[tony.mon]

Otherwise, bring the KTM, it'll be a laugh seeing that launch. Good luck with finding the parts.

[Duffy1964]

Oh that’s a shame Al, my RD400 had a partial seizure last time out, but I haven’t investigated it yet. However there is a guy called Mally on the RD400 forum hat had issues similar to mine and it turned out to be aftermarket pistons that expanded too much as it was poor quality. So if you find the right size pistons it might be worth checking if they are of a decent quality.
Hope you get it sorted in times


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[AMCQ46]

Otherwise, bring the KTM, it'll be a laugh seeing that launch. Good luck with finding the parts.

That was my fall back as I don’t think the storm clutch going to enjoy drag starts

[AMCQ46]

Oh that’s a shame Al, my RD400 had a partial seizure last time out, but I haven’t investigated it yet. However there is a guy called Mally on the RD400 forum hat had issues similar to mine and it turned out to be aftermarket pistons that expanded too much as it was poor quality. So if you find the right size pistons it might be worth checking if they are of a decent quality.
Hope you get it sorted in times


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So i now know to avoid the Mitaka brand