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-   -   Africa twin xrv 750 engine build (https://www.biker.ie/forum/showthread.php?t=250439)

DavyH 24th November 2019 05:33 PM

Africa twin xrv 750 engine build
 
So this is one with a bit of a difference....it’s being (for the majority),built by my 12 year old son.

It’s very much an unloved lump,but not beyond redemption. Was a solid daily runner till the output shaft let go on it...managed to source a complete sound gearbox,and he has shown interest in getting his hands dirty so we got stuck in.




[url=https://postimg.cc/mcM948MV][img]https://i.postimg.cc/mcM948MV/0-EF0-B19-C-ED78-4-F9-B-A9-E0-248-A4765-C76-B.jpg[/img][/url]

[url=https://postimg.cc/G8CymGxR][img]https://i.postimg.cc/G8CymGxR/2043-EFB0-AC46-4-E2-E-90-DE-CAF0-AE7626-A2.jpg[/img][/url]

[url=https://postimg.cc/5YbXV1fN][img]https://i.postimg.cc/5YbXV1fN/2-D6-EFED3-CB05-4-E05-982-C-2-C23-C20-A5-A1-A.jpg[/img][/url]

[url=https://postimg.cc/GB12Fr8J][img]https://i.postimg.cc/GB12Fr8J/43-E9-DA72-8-C53-43-E2-B44-B-D4484-D0-DB412.jpg[/img][/url]

[url=https://postimg.cc/VdLXt9QL][img]https://i.postimg.cc/VdLXt9QL/4-ED09-E9-D-806-E-4753-9-DC1-D9953212-D9-E6.jpg[/img][/url]

[url=https://postimg.cc/TKsjfKs2][img]https://i.postimg.cc/TKsjfKs2/5-B428-D80-5-DF6-4262-AA02-B9151-D9465-A9.jpg[/img][/url]

[url=https://postimg.cc/w35kLT1F][img]https://i.postimg.cc/w35kLT1F/731-F98-E3-9116-44-ED-99-EF-CABF9748-A3-E9.jpg[/img][/url]

[url=https://postimg.cc/KRzgjZB1][img]https://i.postimg.cc/KRzgjZB1/80-FFE068-ED6-E-445-B-8-BAF-62-A2-C9-ED24-E8.jpg[/img][/url]

[url=https://postimg.cc/zyhvH3BG][img]https://i.postimg.cc/zyhvH3BG/A3-B09-C49-8-EE4-4-BE8-A449-9-E583767690-F.jpg[/img][/url]

[url=https://postimg.cc/WtpdY295][img]https://i.postimg.cc/WtpdY295/A740551-A-FB4-C-4708-B075-0-DC203440796.jpg[/img][/url]

[url=https://postimg.cc/7CcqKVdM][img]https://i.postimg.cc/7CcqKVdM/D7-AE1524-83-CB-4-AAA-A91-B-43-BC668-B6-D75.jpg[/img][/url]

[url=https://postimg.cc/xNGJrhSS][img]https://i.postimg.cc/xNGJrhSS/E04413-D6-6-F31-4560-8-E6-B-1297965-EA9-F5.jpg[/img][/url]

[url=https://postimg.cc/mzLgnwSP][img]https://i.postimg.cc/mzLgnwSP/FEFF704-D-8-E6-A-4537-815-F-2-CA206-A4-F50-D.jpg[/img][/url]

[url=https://postimg.cc/6y9f0JRK][img]https://i.postimg.cc/6y9f0JRK/FFC9-DE61-51-C3-4-AA9-AFBF-64-E86008881-F.jpg[/img][/url]

DavyH 24th November 2019 05:34 PM

Re: Africa twin xrv 750 engine build
 
Pics are a bit mixed up the way they uploaded.....next stage is getting the casings and barrels vapour blasted,bores honed and gather up some small bits

faz1 24th November 2019 05:45 PM

Re: Africa twin xrv 750 engine build
 
Fair dues to the chap, great to see a bit of interest from the youngsters, best of luck with it....

sharpbikes 24th November 2019 07:07 PM

Re: Africa twin xrv 750 engine build
 
Always good to see the younger generations getting hands dirty especially if it sparks an interest, trying to do the same with my daughter.......... not entirely certain she pays attention though as shes 2 years old :lbhbh:

PADDYOT 24th November 2019 08:14 PM

Re: Africa twin xrv 750 engine build
 
Will ya get that lad a set of overalls before he ruins his good hoody!!

DavyH 24th November 2019 09:12 PM

Re: Africa twin xrv 750 engine build
 
[QUOTE=PADDYOT;3583213]Will ya get that lad a set of overalls before he ruins his good hoody!![/QUOTE]

Too late,already got a bollockin for that:lbhbh::lbhbh:

©-© 24th November 2019 11:53 PM

Re: Africa twin xrv 750 engine build
 
Here's a link to the [URL="https://www.xrv.org.uk/forums/africa-twin/"][U][B]Africa Twin section of the XRV.org forum[/B][/U][/URL], I've received a lot of useful info and advice from it.

DavyH 25th November 2019 07:00 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=©-©;3583215]Here's a link to the [URL="https://www.xrv.org.uk/forums/africa-twin/"][U][B]Africa Twin section of the XRV.org forum[/B][/U][/URL], I've received a lot of useful info and advice from it.[/QUOTE]

Appreciate that,I’ve built about 15 of these motors now....could tell you most of the torque settings off hand:thumbsup2:

SUGS 25th November 2019 08:55 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=PADDYOT;3583213]Will ya get that lad a set of overalls before he ruins his good hoody!![/QUOTE]

..plus 1 but fair dues to the lad. So many today far too interested in Xbox this and PlayStation that .. :thumbsup2:

The Road Runner 25th November 2019 09:28 AM

Re: Africa twin xrv 750 engine build
 
[B]That's awsome at his age.[/B]....:thumbsup2::bikerie:

Japcati 25th November 2019 11:02 AM

Re: Africa twin xrv 750 engine build
 
That's how all kids should be brought up.
Not with eye fone 33 gadgets that cost over a grand.

Fair play to you and your kid too.

dukeNblade 25th November 2019 11:50 AM

Re: Africa twin xrv 750 engine build
 
:thumbsup2::bikerie:

CodeJACK 25th November 2019 03:37 PM

Re: Africa twin xrv 750 engine build
 
Deadly, fair play to him.

I remember asking here years ago about issues with XRV and buying one with a mate of mine. This was the most common failure on em I think???

Was it caused by the notch and fitment of the cog or just the output shaft made of chocolate?

DavyH 25th November 2019 06:58 PM

Re: Africa twin xrv 750 engine build
 
Well it does keep him off the Forthshite for at least a few hours....so can only be a good thing,I was dead set of the vapour blasting but it’s looking like cost may well rule it out...there’s a few more important things that need to be bought and the budget just won’t allow for it I think....a real shame as I do like the raw finish it leaves....anyway we’ll get her prepped and order some bits over next few days and crack on

renniks 26th November 2019 07:49 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=CodeJACK;3583234]Deadly, fair play to him.

I remember asking here years ago about issues with XRV and buying one with a mate of mine. This was the most common failure on em I think???

Was it caused by the notch and fitment of the cog or just the output shaft made of chocolate?[/QUOTE]

The timing chain needs replacing at 50,000miles - factor this in or ask for proof of it being changed if you are buying one around that mark.
Don't ask me how I know...

DavyH 26th November 2019 06:20 PM

Re: Africa twin xrv 750 engine build
 
[QUOTE=CodeJACK;3583234]Deadly, fair play to him.

I remember asking here years ago about issues with XRV and buying one with a mate of mine. This was the most common failure on em I think???

Was it caused by the notch and fitment of the cog or just the output shaft made of chocolate?[/QUOTE]

Output shafts are fairly robust if they’re treated correctly,chain tension and condition play a major part in the destruction. Also using spurious front sprockets and high gears at low rpm,the chatter absolutely hammers them. Just for reference,the shot one on this has 44k mls on it,the replacement has 36k mls....there is no wear on it at all!

PADDYOT 4th December 2019 09:28 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=Japcati;3583224]That's how all kids should be brought up.
Not with eye fone 33 gadgets that cost over a grand.

Fair play to you and your kid too.[/QUOTE]

Agreed. :thumbsup2:
A good 'helper' is worth his weight in gold.

[img]https://i.imgur.com/i5H8H1F.jpg[/img]

Admin 4th December 2019 12:41 PM

Re: Africa twin xrv 750 engine build
 
" wonder what noise a p e b b l e would make, if i dropped one in d e e e r r e e e e " :lbhbh:

Rainman 4th December 2019 12:45 PM

Re: Africa twin xrv 750 engine build
 
[QUOTE=DavyH;3583330]Output shafts are fairly robust if they’re treated correctly,chain tension and condition play a major part in the destruction. Also using spurious front sprockets and high gears at low rpm,the chatter absolutely hammers them. Just for reference,the shot one on this has 44k mls on it,the replacement has 36k mls....there is no wear on it at all![/QUOTE]

This.
The aftermarket drive sprockets will screw up the output shaft, the genuine Honda sprocket is different, as it has a plastic/rubber centre insert, which is softer than the output shaft and won't wear the splines, all aftermarket sprockets that I have seen, do not have this insert.

Olaf Maxwell 4th December 2019 09:37 PM

Re: Africa twin xrv 750 engine build
 
[QUOTE=DavyH;3583214]Too late,already got a bollockin for that:lbhbh::lbhbh:[/QUOTE]

He did or you did??

Olaf Maxwell 4th December 2019 09:39 PM

Re: Africa twin xrv 750 engine build
 
[QUOTE=Rainman;3583582]This.
The aftermarket drive sprockets will screw up the output shaft, the genuine Honda sprocket is different, as it has a plastic/rubber centre insert, which is softer than the output shaft and won't wear the splines, all aftermarket sprockets that I have seen, do not have this insert.[/QUOTE]
That insert is a shock absorber....critical little piece of kit and makes it expensive to manufacture.

PJ 5th December 2019 08:25 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=Admin;3583581]" wonder what noise a p e b b l e would make, if i dropped one in d e e e r r e e e e " :lbhbh:[/QUOTE]

That's what I was thinking, or maybe that missing 10mm socket.

DavyH 5th December 2019 10:22 AM

Re: Africa twin xrv 750 engine build
 
Gaskets and bearings are in,waiting on piston rings....need to send the barrels off for honing. And going to get rocker covers and side casings vapour blasted so we can paint them magnesium gold,so they’ll have the look of the crf1000 side casings ....lots to do,he’ll learn on the way out of this....easy to strip a motor,4 times the work putting it together right

DavyH 5th December 2019 10:23 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=PADDYOT;3583572]Agreed. :thumbsup2:
A good 'helper' is worth his weight in gold.

[img]https://i.imgur.com/i5H8H1F.jpg[/img][/QUOTE]

:lbhbh:

It’s infectious,where’s his overalls :lbhbh:

DavyH 5th December 2019 10:24 AM

Re: Africa twin xrv 750 engine build
 
[QUOTE=Olaf Maxwell;3583604]He did or you did??[/QUOTE]

I got my ass handed to me for that,water off a ducks back giving the young lad shit:ninja:

DavyH 5th December 2019 10:36 AM

Re: Africa twin xrv 750 engine build
 
He’s got a page setup on Instagram if anyone wants to follow the wee maun

[url]https://www.instagram.com/p/B5qdNHWFTo8/?igshid=1ih85zrsuc4q3[/url]

ascalon 14th December 2019 10:09 AM

Re: Africa twin xrv 750 engine build
 
Fair play, nothing like seeing it all in real life and feeling how it goes together.

Great motors too.

Always liked the idea of the Bros 400 gear box with the XRV top end and 650 Bros bottom end in the Bros chassis. Or some such mix, it's all misty now :)

At the risk of an infraction, this is why we need a "Like" button.

Mr Snapped Banjo String 14th December 2019 03:14 PM

Re: Africa twin xrv 750 engine build
 
Always liked the idea of the Bros 400 gear box with the XRV top end and 650 Bros bottom end in the Bros chassis. Or some such mix, it's all misty now :)


Why?????
Africa twin engine in the bros frame... enough done and said.... never buy a front tyre again....

DavyH 14th December 2019 05:12 PM

Re: Africa twin xrv 750 engine build
 
The mans got a point,the gearing on the AT doesn’t lend itself well to the bros chassis...a bros 400 gearbox is close ratio and would work well,but you’ll end up with a shorter input shaft and have to use a bros clutch,I don’t think it would last long in the 750

ascalon 18th December 2019 01:40 PM

Re: Africa twin xrv 750 engine build
 
Aye, that was it. I remember in my own Bros ownership, researching the close ratio 400 box on the 650 bottom end with the 750 barrels and carbs, or some such.

As I said, it's all a bit misty now. But general result was the sweet chassis, with close ratio box and bags of grunt.

A 750 Hawk. :)


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