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Help please with Thunder Tiger GP42

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Cliff Bastow02/08/2020 09:56:38
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924 forum posts
468 photos

Hi all,

A long shot I know but I don't suppose anyone has a a head gasket set for one of these available or knows where I could get one from?

Thanks in advance, Cliff.

Denis Watkins02/08/2020 10:17:06
4649 forum posts
131 photos

USA £1.90 airmail

A lad produces them, on ebay, have used many times

£4.56 for 2 gaskets

And many more motors

Jon - Laser Engines02/08/2020 10:26:08
5623 forum posts
271 photos

If all else fails a layer or two of aluminium tape will do the job. If you can get the right part then do, but if not then it will work fine.

Cliff Bastow02/08/2020 10:27:47
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924 forum posts
468 photos

Any details please Denis?

Denis Watkins02/08/2020 11:27:25
4649 forum posts
131 photos
Posted by Cliff Bastow on 02/08/2020 10:27:47:

Any details please Denis?

Sorry not to put in a link Cliff, as I previously did that on another post and had to change my eBay access as I had inadvertently sent the link into my account.

Try this search on eBay

Thunder Tiger GP-42 Cylinder Head Gasket 2 Pack NIP

Kevin Fairgrieve02/08/2020 11:29:12
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1682 forum posts
2980 photos

Could it be these?

Head gasket

Kev

Paul Marsh02/08/2020 11:40:10
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4102 forum posts
1234 photos

I normally don't use them, as long as the surfaces are tight, never got any leaks. I do have loads if them spare, anyway.

Cliff Bastow02/08/2020 11:47:49
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924 forum posts
468 photos

That's them thanks Kevin, order placed, many thanks.

Cliff

Engine Doctor10/08/2020 09:20:30
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2618 forum posts
40 photos

The original head gasket / shim was made from aluminium. Using the softer gaskets may cause head distortion. Are you sure the original is not stuck in the head ? They get pressed in and can look like the casting.

I would suspect that the replacements are thicker ? This would retard ignition and loose some top be power . On the plus side engine will be very docile and have a good idle.

Paul Marsh10/08/2020 10:41:11
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4102 forum posts
1234 photos

The gaskets I had in the box are blue fibre type. maybe changed it, can look at inside a new older box and newer new box engines and see..

No, they are both fibre, of different colours. both brand new engines, have about 20 new ones on the shelf, some more used spare.. proably have around 40 of these engines altogether, Probably one of the best 40 size engines made.

I remember that first they were sold for about £30 in the late 90's.

ttgp42s.jpg

Edited By Paul Marsh on 10/08/2020 10:51:01

Alan Gorham_10/08/2020 11:44:52
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1335 forum posts
146 photos

Paul you are showing silencer gaskets but the OP is looking for cylinder head gaskets which are usually ali shim.

gangster10/08/2020 11:53:51
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1049 forum posts
29 photos

Many years ago a mate acquired an old K&B 45. He struggled with head gasket issues so I had a try. After a couple of failed attempts I stood in my workshop eying the errant motor with contempt and chewing on Mr Kipling fruit pies. That was the eureka moment. The cure involved the pie cases. I cannot remember the exact layering but was something like teo layers of foil pie case with perhaps thick paper between them. Perfect cure and the motor was a goodun

Paul Marsh10/08/2020 15:24:15
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4102 forum posts
1234 photos
Posted by Alan Gorham_ on 10/08/2020 11:44:52:

Paul you are showing silencer gaskets but the OP is looking for cylinder head gaskets which are usually ali shim.

Oh, right. I thought he mean exhaust head gasket. Why would anyone want to lower the compression? The engine works ok as it is, and probably upset the running, unless you want to convert it to petrol.question

Alan Gorham_10/08/2020 16:02:13
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1335 forum posts
146 photos

The OP hasn't explained why he needs one, but it's more likely to be that either he's had the head off and the gasket has come off the cylinder head and become creased or the OP thinks his engine doesn't have one possibly.

Engine Doctor up the thread points out that ali gaskets are frequently so thin that it can often seem as if no gasket is fitted.

Paul Marsh10/08/2020 17:15:23
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4102 forum posts
1234 photos

found a scrap one in a junk box, no carb, exhaust, but complete.

gp42spare.jpg

Engine Doctor10/08/2020 19:41:01
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2618 forum posts
40 photos
Posted by Paul Marsh on 10/08/2020 15:24:15:
Why would anyone want to lower the compression? The engine works ok as it is, and probably upset the running, unless you want to convert it to petrol.question

The gasket is used to make seal as they should be annealed when new and conforms to both surfaces . Its not for lowering the compression in this case Although many engines from yesteryear gave you a couple of different thickness shims for use with different types of fuel plugs etc.

A new gasket/ shim can easily be cut from a small piece of annealed litho plate or as said earlier some aluminium pie case although it should be a thicker type like a ali baking tray . Use the line for a pattern and a scribe . Cut the center out with a scalpel then cut the outer with a pair of sharp scissors . Not bad engines for their day but took forever for the piston liner to fully run in .

making a head shim using this method has sorted a few four-strokes over the years that kept on throwing props.

I have an Enya 60 4c in a 2x Lady Bird That was unusable as it kep throwing the prop. I tried everything form different fuels to plugs and two washer under the plug etc to no avail . I then cut a shim from litho plate andthe engine is transformed with no loss of power .

Cuban810/08/2020 19:52:16
3050 forum posts
1 photos

While on the subject of gaskets..............a little outside of the scope of the original query, so please forgive me for that but I find Allen Millyard's skills quite amazing, entertaining and educational.

Edited By Cuban8 on 10/08/2020 19:53:44

Engine Doctor11/08/2020 09:43:25
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2618 forum posts
40 photos

He's amazing . The engine configurations he makes are mind boggling.

Mike T11/08/2020 12:43:16
572 forum posts
35 photos

Any tips on the best way to seal the fuel inlet 'banjo'?

I've just replaced my old GP42 (20+ years hard service) with a newer one with the metal banjo. I've tightened the carb body in as far as I dare and am still getting a bit of fuel mist from it. Gaskets are going to be a problem as the carb body would screw directly against them and being so small, I imagine they would tear...

Denis Watkins11/08/2020 13:54:43
4649 forum posts
131 photos
Posted by Mike T on 11/08/2020 12:43:16:

Any tips on the best way to seal the fuel inlet 'banjo'?

I've just replaced my old GP42 (20+ years hard service) with a newer one with the metal banjo. I've tightened the carb body in as far as I dare and am still getting a bit of fuel mist from it. Gaskets are going to be a problem as the carb body would screw directly against them and being so small, I imagine they would tear...

You can still get gasket paper Mike

Then clean the bottom surface of the carb. Use a black maker to cover the surface, then print this shape on the paper

To scalpel the gasket from

Edited By Denis Watkins on 11/08/2020 13:59:03

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