Author Topic: cb500rs  (Read 131 times)

mad99mike

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cb500rs
« on: November 05, 2020, 05:04:57 AM »
hi yep i have one of these using a ft500 engine i realise this is similar to the xr500/xl500 which is a easy fit, has anybody got any knowledge of fitting a xbr500 in the cb250rs frame any info gladly received.

Moto63

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Re: cb500rs
« Reply #1 on: November 05, 2020, 08:38:28 AM »
Morning Mike, yes myself and big bro (mainly big bro) put an XBR engine into an RS250 frame. Needs a whole load of work to do it though, so be warned. I did a fair bit of welding to brace the frame in certain areas.  As I’m sure you’re aware the XBR is a cradle frame where as the RS uses the engine as a stressed member (ooo eerr vicar 😉). The project is still on going and will eventually be used as a trackday/hillclimber, it is being built simply for a spot of Tom foolery really and probably not as a road bike. I’ll ask Matt if he’d be so kind as to pop some photos up as I’m clueless in that department. Cheers.. Michael

FOXY

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Re: cb500rs
« Reply #2 on: November 05, 2020, 04:53:05 PM »
Hi All, I am just beginning to build up what I hope will be a CB500RS.

 If anyone has an XL/XR/FT 500 single engine they would like to move on please let me know.

 Thanks Foxy

mad99mike

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Re: cb500rs
« Reply #3 on: November 05, 2020, 05:30:19 PM »
thanks moto63 would be interested to see some pics just thought it was aquick way to 44hp but sounds like a lot of work it was really because the xbr engine is in the shed the alternative  was to put it into my norton featherbed but seen one and it looks a bit lost in there.

Moto63

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Re: cb500rs
« Reply #4 on: November 05, 2020, 06:09:38 PM »
Evening Mike, my apologies mate but unfortunately I don’t have any photos of the bike in it’s semi built up stage to post at the moment. The bike is stripped down at present  in a hundred pieces 😥 and as I say it’s an on going project so not to sure when I’ll get round to start on it again. All the best if you do decide to go for it 🤞👍
Cheers, Michael

xbally

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Re: cb500rs
« Reply #5 on: November 05, 2020, 08:15:45 PM »
Doesn't Rossco500 on here have one of these?
CB250RSA  XBR500  ROYAL ENFIELD INTERCEPTOR 650
DUCATI M750 MONSTER

Rossco500

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Re: cb500rs
« Reply #6 on: November 08, 2020, 12:07:25 AM »
Sorry, not me who built the CB500RS. Think it may have been Steve who set up this forum. I have a vague recollection of reading a write up possibly on this forum years back or or in one of the bike magazines. Probably using the XL / FT motor.

Regards

Tony

Moto63

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Re: cb500rs
« Reply #7 on: November 08, 2020, 10:35:03 AM »
Think it was tevie54 who built a cb500rs if my aching brain isn’t playing up to much. I don’t recall anyone on the TC site having built an XBR engined RS. Not 100% sure though.

themoudie

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Re: cb500rs
« Reply #8 on: November 08, 2020, 11:02:43 PM »
Aye,

SteveH used an XL500 engine in a CB250RS donor bike, I believe. I seem to remember at least one picture and there was also at least one article published in a paper magazine that the Thumper Club used to publish in the early days. I'm not sure if there are any copies still about or what date that it might be, but suggest before 2005.

Regards, Bill

tevie54

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Re: cb500rs
« Reply #9 on: November 23, 2020, 10:31:27 AM »
Hi Everyone
Yes I've still got mine, it's got a 1980 XL500 engine but you can use an XR or FT engine, these are the easiest to fit although it's not 'easy' there is a lot of fettling.
I have seen an XBR engine fitted to an RS but it's not an easy fit, the mounting points are all different and you have to find somewhere to put the oil tank as it's a dry sump engine. In my opinion it doesn't look right, the angle is all wrong but that's just me.
I've put a few videos on youtube over the years to show how I've done mine and it's in this months Practical Sportsbikes magazine.
If I can be of any help please feel free to ask any questions as I  want more of these bikes to exist.