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Post by scooternub on Apr 16, 2021 15:53:28 GMT -5
I have a question about installing a tecnigas silent minarelli. in the package is a bag of parts which is 2 Allen key bolts, two spacer bolts?, then two washers. The instructions Way off to what I need to do I think about installing this exhaust. if you can take a look at the pictures do I put the spacer washers between the bracket and engine on the exhaust then install the washers onto the Allen key bolts and install?    |
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Post by repherence2 on Apr 16, 2021 16:35:22 GMT -5
Most likely yes.
Spacer between engine case and exhaust bracket, then washer, then socket head capscrew.
At least it came with spacers and bolts. I have cracked 2 V8 pipes at the flange in my early days by drawing the bracket in with the bolts. The simple solution to solve the spacing issue with the YMS V8 is to use old/used roller weights as the spacers. V8's didnt come with hardware.
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Post by scooternub on Apr 16, 2021 16:51:06 GMT -5
Most likely yes. Spacer between engine case and exhaust bracket, then washer, then socket head capscrew. At least it came with spacers and bolts. I have cracked 2 V8 pipes at the flange in my early days by drawing the bracket in with the bolts. The simple solution to solve the spacing issue with the YMS V8 is to use old/used roller weights as the spacers. V8's didnt come with hardware. here's the photos of the exhaust installed. can you look at the picture how close the exhaust is to the tire? should I use roller weights? versus those spacers? The last picture is the upside down facing up between by the bracket exhaust and the tire and that's where the exhaust is so close      |
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Post by aeroxbud on Apr 16, 2021 17:01:46 GMT -5
It doesn't look too close to the tyre. But the perspective might be different in a picture.
I usually put one bolt in loosely, just a few threads for support, in the mounting bracket. Then pinch the exhaust flange bolts up. It gives you an idea of the position, the pipe wants to naturally sit.
Then you can work out the spacing. You don't want pressure on the exhaust. That's how they snap.
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Post by scooternub on Apr 16, 2021 17:05:48 GMT -5
I found this problem and I'm working on it.   |
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Post by scooternub on Apr 16, 2021 17:55:18 GMT -5
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Post by scooternub on Apr 16, 2021 18:07:10 GMT -5
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Post by aeroxbud on Apr 16, 2021 18:19:56 GMT -5
Glad you got it sorted.
Did you remove the restriction?
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Post by scooternub on Apr 16, 2021 19:18:52 GMT -5
Glad you got it sorted. Did you remove the restriction? actually there wasn't any, it was all straight open. but I did find that there is a welded piece on the head of the engine exhaust part blocking a little bit over quarter of the size. |
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Post by scooternub on Apr 16, 2021 19:53:04 GMT -5
Glad you got it sorted. Did you remove the restriction? actually there wasn't any, it was all straight open. but I did find that there is a welded piece on the head of the engine exhaust part blocking a little bit over quarter of the size. if I took something to get that out is that called port work? |
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Post by Zino on Apr 16, 2021 20:26:32 GMT -5
on the engine that is port work, exhaust port work should add higher rpms alot of us will polish the exhaust port so it flows faster and match the exhaust port size to the pipe size .
I found with that exhaust stock rollers and springs worked ok a 1/2 gram lighter and medium springs made it real fun .
As far as up jetting i had to go up the same as a expansion pipe about 5 %.
That is a fun stealthy pipe adds some top end and gives a lot better take off with a wide powerband ,
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Post by scooternub on Apr 17, 2021 4:32:28 GMT -5
on the engine that is port work, exhaust port work should add higher rpms alot of us will polish the exhaust port so it flows faster and match the exhaust port size to the pipe size . I found with that exhaust stock rollers and springs worked ok a 1/2 gram lighter and medium springs made it real fun . As far as up jetting i had to go up the same as a expansion pipe about 5 %. That is a fun stealthy pipe adds some top end and gives a lot better take off with a wide powerband , thanks. can't wait to get it all back put together I got my carb hanging out waiting for Jets. I have to scroll back through my threads and find a thread or post I made where I weighed the stock rollers to show where I'm at. |
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Post by scooternub on Apr 17, 2021 6:11:17 GMT -5
on the engine that is port work, exhaust port work should add higher rpms alot of us will polish the exhaust port so it flows faster and match the exhaust port size to the pipe size . I found with that exhaust stock rollers and springs worked ok a 1/2 gram lighter and medium springs made it real fun . As far as up jetting i had to go up the same as a expansion pipe about 5 %. That is a fun stealthy pipe adds some top end and gives a lot better take off with a wide powerband , thanks. can't wait to get it all back put together I got my carb hanging out waiting for Jets. I have to scroll back through my threads and find a thread or post I made where I weighed the stock rollers to show where I'm at.  |
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Post by oldgeek on Apr 17, 2021 6:41:57 GMT -5
Great work on the exhaust mounting, pretty much exactly how it needs to be done so there is no stress what so ever on the pipe to cylinder connection. Sometimes you can slot the exhaust flange just a bit so you can twist the pipe around and sometimes you have to slot or enlarge the pipe hanger bracket holes.
Now do yourself a favor. Put it back together as it is before changing the jets or springs and see how it performs. You may not have to change anything. Your jetting is close enough that you will not damage anything. It is a PITA but change only one thing at a time! Changing too much at once is the #1 mistake when doing tuning or upgrades. Very small changes to anything can have a large impact overall.
I really dont think you will be needing the yellow contra spring, please try without it first.
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Post by oldgeek on Apr 17, 2021 7:03:41 GMT -5
A closer look at the last picture showing the pipe to cylinder mounting concerns me a bit. It could be just the picture, but is the pipe flange absolutely flat against the cylinder? If not, remove the pipe hanger bracket bolts and snug the flange to cylinder bolts up good. Now see where the pipe hanger bolt holes line up. If the pipe hanger bolt holes do not line up, try slotting the exhaust flange on the pipe just a bit so you can turn the pipe a bit. I have had pipes that line up terribly when bolted only to the exhaust flange, sometimes you have to get real creative with the pipe hanger mounts. The pipe should not be moving at all when you tighten up the hanger bolts. I hope this helps.
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