Author Topic: 350cc conversion  (Read 5904 times)

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Offline Paul Dawkins

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350cc conversion
« on: November 02, 2012, 08:01:15 PM »
OK then
We are nearly ready.

The bike is not with me yet but soon will be.

I have the heads and barrels.

One barrel is on 0.75 and the other is on 1mm

So whats next?
Any volanteers for blasting, painting, rebores etc?
Southampton

Offline davecumbria

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Re: 350cc conversion
« Reply #1 on: November 05, 2012, 08:44:35 PM »
I've had a word with Rob Pemberton down at Skellerns regarding the project.

He has done the conversion many times and it can be done to various stages of tune. Initially Rob talked about putting in DT175 pistons and RD400 Rods, but I suggested that we may be into a bit of a dodgy area creating a 100mph plus pocket rocket to let club members loose on :D


So the suggestion is to fit Wossner pistons (like wiseco's but less expensive)

Rob had suggetsed that there is no need to upgrade the  oil pump to 350 unit  due to the efficiency of modern oils and the fitting of a 1 tooth larger front sprocket would negate the  requirement of installing the 350 primary drive and clutch.

He's gone into length about the set up as well, suggesting 1.56 BTDC and jetting to 170 then coming down as necessary.

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Offline Paul Dawkins

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Re: 350cc conversion
« Reply #2 on: November 05, 2012, 08:49:08 PM »
1.56 BTDC even with the zeeltronix ignition fitted ?
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Offline Preload

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Re: 350cc conversion
« Reply #3 on: November 06, 2012, 08:14:35 AM »
Rob's a top bloke really knows his stuff he sorted my barrels and gave me endless info which all panned out perfect. :)
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Offline Paul Dawkins

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Re: 350cc conversion
« Reply #4 on: December 20, 2012, 01:52:57 PM »
Moist donated the set of heads that arrived today.

I have sent the heads and barrels to Norbo for rebore and he will paint them as well.
When there finished he will supply the piston kits/gaskets etc and the rebuild will begin.

Thanks to moist (Yamaha RD breaker) for the heads and Norbo for supplying all the parts at cost and painting.

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Offline 2r9

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Re: 350cc conversion
« Reply #5 on: December 27, 2012, 10:49:49 AM »
Will the DVLA wear the change of cc without inspection? You just used to send in the log-book back in the day - I'm guessing that's changed?

Offline mervin

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Re: 350cc conversion
« Reply #6 on: December 27, 2012, 10:51:50 AM »
dunno maybe we need a tame (Dodgy :D) motorcycle mot inspector to inspect it   :D :D :D :D :D
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Offline 2r9

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Re: 350cc conversion
« Reply #7 on: December 27, 2012, 02:18:34 PM »
I ask because a friend of mine is building a 4 cylinder 500 engine and is worried about the change in cc from 400 to 500.  He's talking about using an XS500 frame to get around the problem.  If a change of cc on the logbook is as easy as it was, he can build it in an RD400 frame, which will look much better.


Offline Paul Dawkins

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Re: 350cc conversion
« Reply #8 on: December 27, 2012, 02:45:21 PM »
I will fill out the V5 and DVLA will probably ask me for proof of CC change.
This will mean going to a MOT recognised garage and get it inspected.
They fill out a form confirming the new CC and its job done.

Im sure I will get over this little problem somehow....
« Last Edit: December 27, 2012, 05:00:40 PM by Paul Dawkins »
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Offline GAZZATT2

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Re: 350cc conversion
« Reply #9 on: December 27, 2012, 03:46:26 PM »
you just need a letter from a garage/engineer stating the new cc
you don't need to MOT it
XSR900  350lc 400F 400f special 400F project
it did look good in a photo lance ?
Picture026" border="0

Offline Paul Dawkins

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Re: 350cc conversion
« Reply #10 on: December 27, 2012, 05:01:15 PM »
you just need a letter from a garage/engineer stating the new cc
you don't need to MOT it

Does it not have to be a VOSA recognised garage Gaz?
IE and MOT station or something..
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Offline GAZZATT2

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Re: 350cc conversion
« Reply #11 on: December 27, 2012, 05:10:04 PM »
no just any bike repair workshop
just needs to be on headed paper
XSR900  350lc 400F 400f special 400F project
it did look good in a photo lance ?
Picture026" border="0

Offline Paul Dawkins

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Re: 350cc conversion
« Reply #12 on: December 27, 2012, 06:51:45 PM »
Well thats real easy to sort then.
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Offline RDnuts

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Re: 350cc conversion
« Reply #13 on: January 23, 2013, 06:32:55 PM »
things may have changed but you only needed proof of cc when you went down cc or changed tax class as the tax class is not changing i quess you only need to tell the insurance company and dvla that its changed cc they may ask for proof
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