ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 9, 2024 19:58:44 GMT 1
Hello everyone
Recently the Gaskets for the exaust became leaking. I fixed this with sealing Compound but after a few Days the seal was broken an it leaked Fuel again.
Does anyone know what Gaskets you need for the Yamaha RD250LC 4L1. The Diameter was around 50 mm, this is not 100 % acurate because it was bent quite a bit. Also the Gasket was built like a Spiral out of Rubber and Aluminium.
Greetings Ronnie
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Post by chrisg on Mar 9, 2024 22:15:32 GMT 1
Is it an early 250 ie. 1980?
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 9, 2024 22:27:44 GMT 1
Is it an early 250 ie. 1980? I think it an newer one but how can you see that for shure? |
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Post by chrisg on Mar 10, 2024 0:06:03 GMT 1
The crush type gasket you describe is standard. Early 350s, not sure if the 250, had a spacer type steel washer in the exhaust recess. Try new crush washers and see how you go.
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 10, 2024 7:44:08 GMT 1
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Post by 4l04ever on Mar 10, 2024 10:00:45 GMT 1
Can you post up pics of the cylinder exhaust outlet and the exhaust flange, as there are a few different combinations?
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red998
Drag-strip hero
Posts: 211
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Post by red998 on Mar 10, 2024 10:33:50 GMT 1
I use those gaskets and they seem to work fine, have had them a little while. I use them on a 250LC as well. |
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Post by 4l04ever on Mar 10, 2024 10:48:13 GMT 1
There are 3 versions of the 250 cylinders. The early kind use a smaller gasket like the RD125LC and the air-cooled bikes.
The laster two versions use the larger gaskets.
The early 1980 exhaust (thin flange) on early cylinders need just the smaller gasket.
The modified 1980 (thick flange) exhausts on early cylinders need a spacer fitted in the cylinders and a larger gasket.
The modified 1980 (thick flange) exhausts on later cylinders need two larger gaskets fitted per cylinder.
The 1981 and the 4L2 exhausts (medium flange) use just one gasket in the cylinder side - small for early cylinders or large for later cylinders.
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 10, 2024 11:37:15 GMT 1
Can you post up pics of the cylinder exhaust outlet and the exhaust flange, as there are a few different combinations? How can you post pictures in this thread? Copy pasting doesent work |
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Post by 4l04ever on Mar 10, 2024 12:14:34 GMT 1
Use Tapatalk app from your phone is the easiest.
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 10, 2024 12:37:06 GMT 1
Use Tapatalk app from your phone is the easiest. This fliker service drives me crazy
Gasket itself
Flange
exaust port
Exaust
Serial number of the exaust on the left side
Tell me if you need another angle of something, unfortunately i cant remove the exaust because i dont have the tools, a friend let me use his.
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Post by 4l04ever on Mar 10, 2024 12:46:48 GMT 1
They look like the later exhausts and the bike has tie bars so hopefully the cylinders are not the early ones. You should just need the larger later type gaskets. You can try the YPVS exhaust gaskets which are copper with some high temp silicon.
If it is still not pulling up and sealing well, you may need to put a wire loop (coat hangers work well) on the exhaust between the flange and the lip on the end of the down pipe so the flange can push more on the lip.
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 11, 2024 20:12:13 GMT 1
They look like the later exhausts and the bike has tie bars so hopefully the cylinders are not the early ones. You should just need the larger later type gaskets. You can try the YPVS exhaust gaskets which are copper with some high temp silicon. If it is still not pulling up and sealing well, you may need to put a wire loop (coat hangers work well) on the exhaust between the flange and the lip on the end of the down pipe so the flange can push more on the lip. Thanks alot for the Help I orderd 2 different pairs of Gaskets The Originals and some Aftermarekt ones (Link above) On which Woud you use sealing Compound and wich not. Maby also any spesiffic sealing Compound. Best regards ronnie |
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Post by stusco on Mar 11, 2024 20:21:03 GMT 1
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 11, 2024 20:57:58 GMT 1
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 16, 2024 11:33:09 GMT 1
Is there a correct way to Mount the copper crush ring gaskets |
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Post by stusco on Mar 16, 2024 14:53:16 GMT 1
Im sure they go either way a smear of sealant each side (stops them falling out ) and on with the exhausts and torque up
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ronnie2735
L plate rider.
RD 250 LC 4L1 1981 Enjoyer
Posts: 44
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Post by ronnie2735 on Mar 18, 2024 14:25:27 GMT 1
Im sure they go either way a smear of sealant each side (stops them falling out ) and on with the exhausts and torque up ay thanks |
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