revtothelimit - motorbike forum

I don't know if I like it or not, most of it is good,but some of it is "tarts handbag"

ooh!!! yes please!!!

https://www.mecum.com/lots/1088777/1980 ... -dragster/

I've put my name down, can't go wrong for 45 quid.

https://varnicevs.life/product_details/108324779.html

Dodgy69 wrote: Sat Aug 19, 2023 3:02 pm I've put my name down, can't go wrong for 45 quid.

https://varnicevs.life/product_details/108324779.html

What have you paid £45 for? It looks like part of an Ogri cartoon.

KungFooBob wrote: Thu Aug 17, 2023 7:12 pm I didn't want to start a thread, but here's an interesting story about a very uninteresting bike, the VFR750.

https://www.classicmechanics.com/haslam-stocker-vfr/

Still had the horn on it...

The Spin Doctor wrote: Sun Aug 20, 2023 6:45 pm

KungFooBob wrote: Thu Aug 17, 2023 7:12 pm I didn't want to start a thread, but here's an interesting story about a very uninteresting bike, the VFR750.

https://www.classicmechanics.com/haslam-stocker-vfr/

Still had the horn on it...

I remember Bruce Anstey racing a GSXR1000 at the 2001 UGP and he was beeping at people. Pretty sure it still had the brake light too.

Tribsa trident with more than a little help from the LAverda parts bin and photoshop?

rodbargee wrote: Mon Aug 21, 2023 9:59 am Tribsa trident with more than a little help from the LAverda parts bin and photoshop?

Very strange. Looks like they sawed the Trident gearbox off and used a 1958-63 Triumph box.

At a Cadwell 2-dayer trackday I did last week



What is it, you may ask, or at least that's what I did as I watched it going around in one of the other groups, so I found the owner, who was also the builder of it, and ended up having a really interesting chat with him about it.

Basically it's a home-made RGV500 , constructed by welding 2 x RGV250 motors together, Alan Millyard style, and plonking the lump into a GSXR400 frame, with an R6 rad, and various other bits that he could make do the job by the sound of it.





He was over the moon as this event was only the third time the motor has run, the first two times had resulted in bottom-end seizures within a couple of miles due to crank manufacture / joining issues , and although he definitely wasn't breaking any speed records, had a big smile on his face as he's solved his seizing problem as he was in and out leaving a stinky blue haze around Cadwell

Some quite novel solutions to issues he's encountered, and interesting use of bits from other bikes - my favorite was the lubrication one- as apparently due mainly to his current failure to find a suitable alternative oil pump with sufficient capacity to servve the whole motor, but also due to where the standard oil pump is driven on the RGV, he is currently running two oil pumps- one exactly as standard RGV250, and the other electrically driven.
As initially installed it was apparently massively over-oiling with the gearing he was able to give it, and he currently hasn't worked out a way of regulating the amount of oil that pump provides with throttle position, ( as of course the standard pump does), he has installed a simple speed-control pot as may be seen by the LHS of the tank in the pic below.



Aparantley the paint dot at 9 o'clock is for ticking over/warming up in the assembly area, 12 o'clock is once he's underway on most of the circuit, and as he comes onto the straights he flicks it to 3 o'clock with his left glove, before flicking back to 12 o'clock at the end of the straights just before he tips in

Africa Twin engine shoehorned into a CRF4550 frame!

I wonder why the bloke with the double engined RGV didn't use pre mix for lubrication, it'd be a lot easier and every race two stroke uses premix

Le_Fromage_Grande wrote: Fri Aug 25, 2023 10:59 am I wonder why the bloke with the double engined RGV didn't use pre mix for lubrication, it'd be a lot easier and every race two stroke uses premix

Yup was my first thought too, that, and his explanation of why he didn't made no sense to me either

Tricky wrote: Fri Aug 25, 2023 11:36 am

Le_Fromage_Grande wrote: Fri Aug 25, 2023 10:59 am I wonder why the bloke with the double engined RGV didn't use pre mix for lubrication, it'd be a lot easier and every race two stroke uses premix

Yup was my first thought too, that, and his explanation of why he didn't made no sense to me either

Fair enough.

Le_Fromage_Grande wrote: Fri Aug 25, 2023 10:59 am I wonder why the bloke with the double engined RGV didn't use pre mix for lubrication, it'd be a lot easier and every race two stroke uses premix

I was thinking the same but assumed there must be something I don’t know going on with it?

If you make the mistake of going on any two stroke forums or (worse still) Facebook groups, they're are quite a lot of vociferous people who will tell you how an oil pump is massively better than premix, you can point out as many times as you like that MX bikes and GP bikes use premix and they will retort with some closed throttle theory

Le_Fromage_Grande wrote: Fri Aug 25, 2023 1:52 pm If you make the mistake of going on any two stroke forums or (worse still) Facebook groups, they're are quite a lot of vociferous people who will tell you how an oil pump is massively better than premix, you can point out as many times as you like that MX bikes and GP bikes use premix and they will retort with some closed throttle theory

On race bikes I'd always go premix. But very happy with the oil pump on the GasGas

Yorick wrote: Fri Aug 25, 2023 1:54 pm

On race bikes I'd always go premix. But very happy with the oil pump on the GasGas

That's because it's a touring bike

Le_Fromage_Grande wrote: Fri Aug 25, 2023 2:05 pm

Yorick wrote: Fri Aug 25, 2023 1:54 pm

On race bikes I'd always go premix. But very happy with the oil pump on the GasGas

That's because it's a touring bike

It is in comparison to MX bike.
But rumours are that the KTM enduro bike will be premix in 2024.

I have never seized a two stroke that used premix.

Oil pumps are more reliable than ever, but they are still a potential for failure.

Sad that the only two stroke I own now is my petrol strimmer (but that does run premix).

https://ridermagazine.com/2023/06/28/su ... 24-lineup/

Yanks get the Suzukis I like