R1 40mm carbs

dandywarhol · Post by **dandywarhol** » Sat Mar 07, 2015 10:11 pm

Has anybody thought/tried fitting R1 40mm carbs to their engine?

I'm having difficulty getting a set of TDMRs and can't afford a new set.

ge0ff · Post by **ge0ff** » Sun Mar 08, 2015 1:34 am

I'd be curious to see how you get on with this.

I'd love to open the ole girl up a bit but the FCR's are a big chunk of cash.

dandywarhol · Post by **dandywarhol** » Sun Mar 08, 2015 1:48 am

What I don't get is that a lot of car boys use them on Ford/Volvo engines as sidedraught carbs but they're downdraught on the R1, like the TRX

ge0ff · Post by **ge0ff** » Sun Mar 08, 2015 3:38 am

I'm a child of my generation unfortunately - stripping and cleaning or re jetting, no worries. But trying to do something like this, just making it up as I go along.....id probably not get very far.

Have a go and let know how it turns out lol

Con Rod · Post by **Con Rod** » Sun Mar 08, 2015 8:24 am

dandywarhol wrote:What I don't get is that a lot of car boys use them on Ford/Volvo engines as sidedraught carbs but they're downdraught on the R1, like the TRX

hmm might be an issue setting float heights there

SDN · Post by **SDN** » Sun Mar 08, 2015 8:55 am

wonder what that does to power / fuel consumption

NWS870R · Post by **NWS870R** » Mon Mar 09, 2015 12:32 am

You could buy a full set of brand new YZF750 FCR41's for the same price as a pair for a TRX (Â£800ish) & split the cost between you? Just a thought?

dandywarhol · Post by **dandywarhol** » Mon Mar 09, 2015 12:42 am

A good idea NWS - thought of that one before but is there not just one pumper feeding 4 carbs?

I've been down that road earlier with TDMR40s - someone had split a set of 4 and muggins here bought the pair without the pumper - luckily the German seller took them back and paid the post back..................

NWS870R · Post by **NWS870R** » Tue Mar 10, 2015 12:00 am

All parts/spares are readily available & it's still cheaper than Â£900 for a TRX specific kit?

dandywarhol · Post by **dandywarhol** » Tue Mar 10, 2015 12:18 am

OK thanks - I'll look into it. Are the FCRs jst the one pumper and a fuel link to the other carbs?
Could you then fit a pumper pump/linkage etc. to the remaining pair if split up?

PS, answered my own question - the FCRs appear to have twin pumpers, one per pair as opposed to the Mikuni TDMR which appear to have only one pump feeding 4 carbs

NWS870R · Post by **NWS870R** » Wed Mar 11, 2015 1:05 am

Kerching!!!!

dandywarhol · Post by **dandywarhol** » Wed Mar 11, 2015 1:44 am

NWS870R wrote:Kerching!!!!

,

Ok, ok - it takes a bit of time til the penny drops at my age - life's still a big learning curve

bagmaker · Post by **bagmaker** » Wed Mar 11, 2015 11:19 am

I purchased a set of 39fcrs from a kwaka 750 drag bike (USA ebay) and the set only had one pump.
That said, no big deal to get another pump happening from parts

Kayla · Post by **Kayla** » Wed Mar 11, 2015 8:20 pm

I split a set of R1 carbs to fit on a TRX a few years ago for someone. There was only one pump on them and it was only the centre pair that were used as they were spaced right to fit the TRX from the start, meaning the two 'end' carbs were spare.

If you decide to split a bank of R1 carbs into two, splitting them down the centre into pairs, you'll need two new throttle rods as they're machined to suit the spacing of the carbs. Maybe Allens could supply them, I don't know. You'd also need new ally spacers and blanking plugs.

It's doable but I think it'd end up being an expensive PITA.

dandywarhol · Post by **dandywarhol** » Wed Mar 11, 2015 9:29 pm

Thanks for your input folks - all invaluable................

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R1 40mm carbs

R1 40mm carbs

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