Diff'rent Strokers

eire_kp61 · Joined: 05 Jul 2008 Posts: 43 Location: Kilkenny Ireland

well karl hows things ,

its been a long long time since ive been on here ,
looks like were both still rebuilding

ive had absolutely no time or funds to work on my 3xv the last few months,

my 2 cranks are still over at stans and he wants 550 sterling to rebuild them into one Rolling Eyes

but i agree with wb that it no easy task to build up a crank at home , im a qualified mechanic and i have a bearing press and i still didnt want to chance it , eather would my local bike shop

ive bought a good crank out of a running bike that was crashed so i think il just get the other 2 posted back to me

arlurt · Posted: Tue Aug 04, 2009 7:20 am Post subject:

Hi there!

Good to hear from you, I'm pleased it's not just me that's slow getting my projects finished. The garage is finally and very slowly making progress. Shelves now up on one side, and stuff moving off the floor and out of the way. Then I can get on with the bike, other projects permitting...

I've inherited a tandem (pushbike) which is stopping the proper jobs at the moment, stripped and re-painted, hope to have that back together in a week or two, then back to the planned tasks.

I know that the crank rebuild thing has brought out some strong opinions, but I've got some good advice and fancy havin' a go, so I will.

I'll post on here as and when.

Good luck with yours. Wink

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arlurt · Posted: Mon Oct 26, 2009 9:33 pm Post subject:

Strokerboy said people might laugh...

My garage is just about ready for fitting out, benches and such, then finally I can get my spanners out and play with the 3XV.

It's only been five years since I started work on the house extension. Slow and steady wins the race...? Wink

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RichG · Show Star ! Joined: 04 May 2009 Posts: 7 Location: Leeds

I've just read this entire post, you have certainly been on a long (and painful at times and costly) journey Karl! Can you still buy new TZR 3XV cranks complete from Yamaha? I'd be inclined just to do this and finish the job.

To give you a different perspective, in 2 years I've bought 2 NSR250 MC21s, both of which have had full engine rebuilds with brand new cranks. My approach has been to get all the parts required and then get the engine rebuilt as quickly as possible and the back in the bike. Each strip & rebuild was a matter of weeks (cases off for vapor balsting consumed the most time).

But its what works for the indivdual and we're all different, but wouldn't it be nice to see your bike finished 'this winter'? best of luck.....
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NSR250 MC21SP Rothmans / MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA

eire_kp61 · Joined: 05 Jul 2008 Posts: 43 Location: Kilkenny Ireland

Cranks can be got new from yamaha rich but there 1000 euro ish

Theres a lot of 3xv's left sitting up due to availibilty of parts , most due to crankshaft problems

Wb · Joined: 22 Jan 2007 Posts: 49

A brand spanking new R crank is around £570 through Webbs Yamaha in Lincoln including your 10% discount if you are a member of the TZR forum (speak to Andy Tempest and mention the TZR forum). A new SP crank is £681 including your 10% TZR forum discount.

I have a decent R crank I removed to replace with an SP jobbie for a track motor - the motor was sweet and the bearings all feel good, but I'm not sure of the mileage so it's sold as a rebuild candidate really. £150 if anyone wants it. PM me if you do.

Cheers

arlurt · Posted: Sat Nov 21, 2009 1:59 pm Post subject:

That's two benches built, now I've got to move some stuff in from my old garage, welder, compressor, bench drill and grinder. Then sort shelving out under the benches to fit around the stuff I'm moving in.

I'm on a push to get done for Christmas as I hope to be working on the 3XV over the holidays, with a plan to have it running for spring...
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arlurt · Posted: Tue Dec 08, 2009 6:38 pm Post subject:

Something to play with over Christmas... Cool

Thanks Dan.
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StrokerBoy · Posted: Thu Dec 10, 2009 12:38 pm Post subject:

arlurt · Posted: Fri Dec 11, 2009 10:19 am Post subject:

Nice idea, but struggling to get one that runs as a V Twin at the moment... Laughing

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arlurt · Posted: Sun Dec 13, 2009 7:41 am Post subject:

Christmas is coming so I must get on...

Where I've been able to easily leave things connected, I have. This is intended to be a way of getting the bike running quickly using what I've got in the garage, while I sort out the other engines and decide what to keep and what goes...

And there you have it. The engine does actually drop out quite nicely, once you've got all the pipes, wires and cables out of the way. I should've bought an RD250.

For a bike that feels so small to ride, there's a big old hole where the engine goes. Now I understand why people put big-single engines in these frames.

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arlurt · Posted: Sun Dec 13, 2009 8:10 am Post subject:

For the moment, I've decided to put the SP engine in, but to fit it with the RS carbs, their reed-blocks and rubbers. The RS carbs are a known quantity, and the bike was adequate with them fitted to the RS engine. My thoughts are that this setup might better suite the standard exhausts and CDI until I decide how to SP-ise enough bits to move towards a full SP setup.

This slightly cautious decission might be made clearer when you look at the difference between the RS (left) and SP (right) carbs below.

My first order from Padgett's came yesterday, I love little plastic Yamaha bags. Very Happy

These are the bits that didn't come with the engine. I've got the carbs, rubbers and reed block, but was missing the clamps to hold the carbs in to the rubbers, and in to the air-box rubbers. The oil pump pipes are missing, and the bolts to fasten the reed blocks into the engine. These were all UK stocked items so they've only taken two days to come.

I've got a second order on it's way, of Japan only items, that will take about 5 weeks. This includes the SP carb to air-box rubbers, and the choke plungers for the SP carbs.

So far getting parts hasn't been too much of a problem...
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arlurt · Posted: Sun Dec 13, 2009 8:55 am Post subject:

Having got the sick RS motor out of the frame I've had a better look to see why it was so solidly seized...

The observant amongst you will see that the con-rod is no longer fastened to the big end. A trick worthy of Paul Daniels in such a small space. I'm expecting the cases to be pretty sick too when I get in there, but there's no sign of a hole on the outside of the engine.

So this is what happens when they "let go"... Confused

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arlurt · Posted: Sun Dec 13, 2009 8:22 pm Post subject:

The "new" engine is in the frame, a little more fiddley than taking it out but that was expected.

Now consulting the Workshop Manual on routing of cables, pipes, wires etc. so that everything goes back in the right place.

There's an awful lot of drains, cooling/carb heating pipes, control cables for oil pump, power valves, servo, choke, throttle, clutch, and the wires to make it all work...

You get the idea.

Hope to have it running in the week. Very Happy

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StrokerBoy · Posted: Sun Dec 13, 2009 8:36 pm Post subject:

Nice one. Glad it's moving forward. Look forward to hearing it running soon. Cool