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Old 10-23-2012, 06:16 AM   #13726
Ladder106
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Joined: Jan 2005
Location: Davis, CA
Oddometer: 4,804
Robo,

Is there really a difference between the 750 and 800 in power or response??

I've also found a very helpful parts place just north of me in Vancouver, Canada. They still have some Big parts available and can get others.

The problem areas are

Valve springs.....discontinued

Piston rings.....discontinued

Gasket kits....very difficult to find or discontinued.

Any idea on where to source these bits??
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Old 10-23-2012, 06:39 AM   #13727
Resi
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You've got mail...

Regarding the drive chain from starter to flywheel: The big one behind the flywheel is interchangeable, IMHO the first one after the starter has a different pin diameter, and the case differs in this area.

I'll take a look at my spare cases, later at home.

Cheers,
Lars
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Old 10-23-2012, 08:23 AM   #13728
Ladder106
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Quote:
The big one behind the flywheel is interchangeable, IMHO the first one after the starter has a different pin diameter, and the case differs in this area.
Therefore.....

If I use the SR43 engine, keep the 43 starter and starter gear train

.....and then install the flywheel and stator from the SR41, it should work, correct.

It will essentially be a SR43 engine with 43 starter system and ONLY SR41 ignition system. I'll keep all the SR41 wiring from the stator and ign. coils up through the 41 wiring harness and use the 41 CDI.

I think the manual decomp. lever and cable from the 41 will also work on the 43.

Once again, a big THANK YOU to everyone out there with more time and experience on these engines that me. I hope to remedy that soon.
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Old 10-23-2012, 11:28 AM   #13729
Resi
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Mates, I took a view on my spare cases, there are differences on the first gear /torque limiter close to the starter:

SR41: 10mm pin, countersunk is 3mm from sealing
SR43: 12mm pin, countersunk is 2mm from sealing

This prevents a SR41 starter gear train 1:1 swap... :(

I lathed a tiny brass part and cleared out the 1. gear to get it work on my Oranje42 with SR43 lump.

Cheers,
Lars
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Old 10-23-2012, 01:50 PM   #13730
juss
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All good things come to those who wait. Guess who just got his claws around this lot for 230.-Eur

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Old 10-23-2012, 11:25 PM   #13731
mait
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Quote:
Originally Posted by juss View Post
All good things come to those who wait. Guess who just got his claws around this lot for 230.-Eur
Sounds like a bargain, Juss. PM sent
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Old 10-24-2012, 01:49 AM   #13732
ztaj
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Location: Nelson-ish New Zealand
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Quote:
Originally Posted by Ladder106 View Post


Piston rings....discontinued

Any idea on where to source these bits??
I know where to get a set of standard rings
In my shed, second set of drawers on the left, top drawer, next to the matching piston.
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Old 10-24-2012, 01:55 AM   #13733
Resi
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Quote:
Originally Posted by ztaj View Post
I know where to get a set of standard rings
In my shed, second set of drawers on the left, top drawer, next to the matching piston.
Hrrhrr

Me too.

Cheers,
Lars
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Old 10-24-2012, 02:11 AM   #13734
robmoto
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Quote:
Originally Posted by Ladder106 View Post
Robo,

Is there really a difference between the 750 and 800 in power or response??

I've also found a very helpful parts place just north of me in Vancouver, Canada. They still have some Big parts available and can get others.

The problem areas are

Valve springs.....discontinued

Piston rings.....discontinued

Gasket kits....very difficult to find or discontinued.

Any idea on where to source these bits??
Ray , world wide ebay for gaskets and other bits and pieces, buy the piston and rings from Ztaj/ James and you can get a new sleave for the cylinder I bought one about a year ago from your state a bloke on ebay had or could get as many as you liked about 80 bucks.
HRT can supply valve springs and piston and rings.
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Old 10-24-2012, 07:04 AM   #13735
Ladder106
It's a short cut, really
 
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Quote:
I know where to get a set of standard rings
In my shed, second set of drawers on the left, top drawer, next to the matching piston.
Nice.....is that an offer to sell it or just a way to say "nyah, nyah" to the poor struggling Yank trying to get his best bike back on the road.

.......sniff.....
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Old 10-24-2012, 07:08 AM   #13736
Ladder106
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Put away the tissues

Tried to find a photo of a small puppy lost on a rainy day but couldn't come up with one.

You lot have been incredibly helpful so far. There should be enough hot-rod shops left in California to get a set or two or rings made for 1st oversized piston.

Heck, I don't even know if I need that yet.
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Old 10-24-2012, 01:40 PM   #13737
ztaj
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Quote:
Originally Posted by Ladder106 View Post
Nice.....is that an offer to sell it or just a way to say "nyah, nyah" to the poor struggling Yank trying to get his best bike back on the road.

.......sniff.....
Just saying.....it's there if you want it. I won't need it.
Make me an offer that won't agravate my tourettes

ztaj screwed with this post 10-24-2012 at 02:57 PM
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Old 10-24-2012, 02:14 PM   #13738
Ladder106
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Never had a cylinder sleeved before.

Does the old one just get pressed out and the new one pressed in?

How do you know the new one goes in "square" ??

Seems like a rather rude process. If OS rings aren't available it might be the best way to go. I haven't gotten to that level of disassembly as yet. Maybe I don't need piston and rings.

James, thanks for the offer. I'll PM you with details
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Old 10-25-2012, 07:09 AM   #13739
bluesman
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needle valves/seats...he need new ones.
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Old 10-25-2012, 07:16 AM   #13740
bluesman
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Quote:
Originally Posted by juss View Post
All good things come to those who wait. Guess who just got his claws around this lot for 230.-Eur
Exactly same I had on my DR.
You going to face 2 challenges but you will not regret doing this conversion!

1. Brake disk on this wheel is odd size. There is nothing out there from any other bike that will be possible to bolt on to get to DR 300mm disk (if SR43). Using Husaberg brakes in front will result in stopping power enough for bike of half DR weight, no more. You will need custom made disk if you going to use this wheel. But DR SR43 wheel only need different bearings pressed in and couple of spacers to fit into those forks.
2. Head bearings. I suggest you use drawing I posted while ago in this tread. It means head axle must be pressed in from the top and fixed by 12.9 grade bolt from underneath. My setup worked fine for I guess about 30-40 000 km.
Sometimes people bore out hole in lower yoke to make stock axle work, but I am against it as lower yoke get considerable load and it;s made of aluminium alloy.Just my 2 cents.

You also will need heavier springs and limit travel to 250 mm (SR43) and may be not for SR41 - can't tell. Limiting travel will require machining cartridge etc. Best bet - send it to Stefan.
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