| Author |  Topic  |
rannsachair
V4 Beginner
United Kingdom
92 Posts |  Posted - 03 Nov 2012 : 11:51:17  
| Thought I would start a new thread in response to 1970V4:
"Nice bikes!
You should keep your eyes out for a 95 or 96 two-stroke car with a blown engine. A bullnose is even better, less weight up front (less sheet metal)and quicker ratio steering rack. Check out my '64 that I recently got going: http://saab-v4.co.uk/speedball/topic.asp?TOPIC_ID=3135&whichpage=1
Strokers are fun but a totally different animal than the V4.
Is the gearbox a 3- or 4- speed? Does it have the drivers that are cups or the ones with flexible rubber bits in them?
"
Gearbox is four speed with cups: 
Engine had been put away with lots of oil - even carbs were full of oil. No visible wear on any compnents: bores perfect as is distributor, carb internals and starter gear looks like new.
Going to paint engine and get all brackets and air filter epoxy coated. Was ready to order gaskets and seals yesterday but Erik's site is down. |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 03 Nov 2012 : 12:25:43
| | Sorry, I cut and pasted 1970v4's post from my previous thread asking if a two stroke engine and gearbox would fit in a 9-5 boot in quotes - and answred his question about the gearbox! |  |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 18 Nov 2012 : 17:32:24
| Helped my Dad get the pistons in the bores, got new o-rings gaskets, oils seals and core plugs from Erik's:
Parts bead blasted and epoxy coated:
New core plugs fitted and a few coats of engine enamel:
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rannsachair
V4 Beginner
United Kingdom
92 Posts | |
Woody
V4 Guru
United Kingdom
2764 Posts | Posted - 18 Nov 2012 : 22:17:45
| Looking good.
Can I ask the dimensions of the gaskets in the poly packet?
ie size of large hole and distance between small holes centre to centre. | |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 18 Nov 2012 : 22:32:26
| quote:
Originally posted by Woody
Looking good.
Can I ask the dimensions of the gaskets in the poly packet?
ie size of large hole and distance between small holes centre to centre.
I will be up at my parents tomorrow night, will measure then and let you know. | |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 19 Nov 2012 : 22:47:07
| quote:
Originally posted by Woody
Looking good.
Can I ask the dimensions of the gaskets in the poly packet?
ie size of large hole and distance between small holes centre to centre.
Was not quick enough, measured the old gaskets: 69.8mm between centres and main bore 46.7 mm - was already assembled:
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Edited by - rannsachair on 23 Nov 2012 12:43:06 | |
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James Ranaldi
V4 Guru
United Kingdom
1475 Posts | Posted - 19 Nov 2012 : 23:06:34
| Looking good. Green and black, real "old school" . Luvvin it. 
Cheers | |
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Tristared
V4 Fan
United Kingdom
186 Posts | Posted - 21 Nov 2012 : 14:30:47
| Cor blimey – look at that!
Nicely done.
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 22 Nov 2012 : 17:07:43
| I purchased a new Head Gasket from Erik, does not look right - to get the gasket central on the bores I will have to elongate the bolt holes and will have about 1/2 the gasket width across some sections near the waterways. Erik has agreed to take it back.
Anyone else experienced this, I would be happier finding another head gasket that fitted better.
See:
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Edited by - rannsachair on 01 Dec 2012 09:50:56 | |
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dansp1
V4 Beginner
51 Posts | |
dansp1
V4 Beginner
51 Posts | Posted - 22 Nov 2012 : 18:02:05
| | Or i have got a solid alloy head gasket 1mm from Niklas if you are interested............. | |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 23 Nov 2012 : 12:44:20
| | Erik has found a problem with his current batch of gaskets, he is speaking to his supplier today. | |
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rsimps
V4 Guru
United Kingdom
1616 Posts | Posted - 11 Dec 2012 : 08:05:15
| If you go down the solid gasket route you will need the block and head grinding to a very high level of finish, then get a can of spray Hylomar and spray 2-3 coats each side.
Have you checked the bores for wear, they seem to wear around the exhaust ports (probably due to bore expansion). You need to get a bore gause down there and measure at set distances and angles to get a picture of the bore wear. On the engine I an rebuilding at the moment it was so bad I had to go up a full 1mm in piston size, 0.5 would be hit and miss. Also is the crank OK? | |
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rannsachair
V4 Beginner
United Kingdom
92 Posts | Posted - 11 Dec 2012 : 20:24:55
| quote:
Originally posted by rsimps
If you go down the solid gasket route you will need the block and head grinding to a very high level of finish, then get a can of spray Hylomar and spray 2-3 coats each side.
Have you checked the bores for wear, they seem to wear around the exhaust ports (probably due to bore expansion). You need to get a bore gause down there and measure at set distances and angles to get a picture of the bore wear. On the engine I an rebuilding at the moment it was so bad I had to go up a full 1mm in piston size, 0.5 would be hit and miss. Also is the crank OK?
I am awaiting a new composite gasket from Erik.
Last 2 stroke my dad rebuilt was a BSA Bantam and only manual I could get hold of is by Autopress Ltd, so not much advice on checking. For Crank just degreased it, firm pull and push on con rods - no discernable movement and span bearings - no noises. Is there much more you can do to check?
I know there was no visible bore wear, will check at ports with internal mic before head goes back. Do you not get a step at the top of the bore like on a worn 4 stroke?
Thanks for advice.
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rsimps
V4 Guru
United Kingdom
1616 Posts | Posted - 13 Dec 2012 : 12:36:41
| Usually you can make some measurments on how much the rod can flop from side to side at an angle (I will have to get a measurment from either the service book or the tuning books for you).
No you can have a very worn bore without any marks at the top. the liner expands around the exhaust port and then wears when hot. What I found is that you get alot of wear around the port areas, not much at the top and a tapper below the ports. At one point I had a max difference of 0.12mm on one bore. You need a bore gauge though to measure at different points down the bore. At this point the engine was blowing past its rings and effecting the crankcase.
Also do a compression test, a std used engine seems to be around 120 psi. | |
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| Topic | |
Two Stroke Rebuild
