1986 CR125 ATAC removed what do I need to block?

Brian_Bowles
Edited Date/Time 1/11/2021 6:05pm
I have a 1986 CR125 that o restored. The bike did not come with its ATAC it was removed and a Pro Circuit pipe was put on. Is there something that needs to be blocked?
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SmokinJoe439 1/2/2021 6:07pm
1/2/2021 6:07pm Edited Date/Time 1/2/2021 6:14pm
No the Pro circuit pipe came with a special bolt on header. The pro circuit pipe is longer than the stock pipe and should take up the extra length the atac chamber did. I had a fully modded PC 86 cr125 long ago. Porting they bored the carb bigger. Suspension mods. They also made this hrc replica swingarm and these square tube aluminium subframes which mine hard.

This ad from 85 shows the swingarm but not the subframes those came a little later. The swingarm changed the adjuster bolts from pull type to push type in front of the rear axle. Some say they were really VRP parts. They did look like VRP parts but there was no brands or markings on the ones I had.



Brian_Bowles 1/2/2021 6:18pm
1/2/2021 6:18pm Edited Date/Time 1/2/2021 10:58pm
SmokinJoe439 wrote:
No the Pro circuit pipe came with a special bolt on header. The pro circuit pipe is longer than the stock pipe and should take up...
No the Pro circuit pipe came with a special bolt on header. The pro circuit pipe is longer than the stock pipe and should take up the extra length the atac chamber did. I had a fully modded PC 86 cr125 long ago. Porting they bored the carb bigger. Suspension mods. They also made this hrc replica swingarm and these square tube aluminium subframes which mine hard.

This ad from 85 shows the swingarm but not the subframes those came a little later. The swingarm changed the adjuster bolts from pull type to push type in front of the rear axle. Some say they were really VRP parts. They did look like VRP parts but there was no brands or markings on the ones I had.



Thanks Smoking Joe. So are you saying that since I have a PC pipe I am good? I am not sure about a special bolt. I do not remember seeing that. Can you tell me what to look for? Here is my set up.
Brian_Bowles 1/2/2021 11:21pm
1/2/2021 11:21pm
SmokinJoe439 wrote:
No the Pro circuit pipe came with a special bolt on header. The pro circuit pipe is longer than the stock pipe and should take up...
No the Pro circuit pipe came with a special bolt on header. The pro circuit pipe is longer than the stock pipe and should take up the extra length the atac chamber did. I had a fully modded PC 86 cr125 long ago. Porting they bored the carb bigger. Suspension mods. They also made this hrc replica swingarm and these square tube aluminium subframes which mine hard.

This ad from 85 shows the swingarm but not the subframes those came a little later. The swingarm changed the adjuster bolts from pull type to push type in front of the rear axle. Some say they were really VRP parts. They did look like VRP parts but there was no brands or markings on the ones I had.



Are you referring to the large hole? I assume the flange covers it. If there is a screw or plug that is supposed to be there I do not have it. Seems the performance would be better if that is the case.
1
SmokinJoe439 1/2/2021 11:46pm
1/2/2021 11:46pm
Yea the flange it comes with blocks the hole it's all good. the DG pipe has the same type of setup.

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Brian_Bowles 1/2/2021 11:48pm
1/2/2021 11:48pm
SmokinJoe439 wrote:
Yea the flange it comes with blocks the hole it's all good. the DG pipe has the same type of setup.
Thanks Joe, it took me a min to figure all of it out. I am glad that I did.
1
bad juju
Profile picture for user bad juju
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bad juju 1/9/2021 11:24am
1/9/2021 11:24am
imagine that works replica swingarm for 300.00 today.
Brian_Bowles 1/11/2021 5:49pm
1/11/2021 5:49pm
bad juju wrote:
imagine that works replica swingarm for 300.00 today.
I bet the price on it would be crazy! I have never even seen one.
mxracer666
Profile picture for user mxracer666
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mxracer666 1/11/2021 6:05pm
1/11/2021 6:05pm
bad juju wrote:
imagine that works replica swingarm for 300.00 today.
Karl Landrus can make you an identical one and ship it right out to you!
SmokinJoe439 1/12/2021 2:59pm
1/12/2021 2:59pm
There's one on mastercross for 850 euro. It's listed as a VRP part. But I believe the original pro circuit one's where really VRP.


Brian_Bowles 1/12/2021 4:06pm
1/12/2021 4:06pm
SmokinJoe439 wrote:
There's one on mastercross for 850 euro. It's listed as a VRP part. But I believe the original pro circuit one's where really VRP. [img]https://p.vitalmx.com/photos/forums/2021/01/12/471962/s1200_Screenshot_20210112_145431_Chrome.jpg[/img]
There's one on mastercross for 850 euro. It's listed as a VRP part. But I believe the original pro circuit one's where really VRP.


That's crazy!
jeffarakbari 1/12/2024 3:46pm
1/12/2024 3:46pm
Brian_Bowles wrote:
I have a 1986 CR125 that o restored. The bike did not come with its ATAC it was removed and a Pro Circuit pipe was put...
I have a 1986 CR125 that o restored. The bike did not come with its ATAC it was removed and a Pro Circuit pipe was put on. Is there something that needs to be blocked?

I called that pro circuit exhaust system I have the same problem with my bike. Somebody took all my exhaust obviously because they're valuable parts for factory spec or whatnot. Pro circuit discontinued manufacturing the bypass or whatever for it maybe somebody can help both of us

SmokinJoe439 1/12/2024 4:01pm
1/12/2024 4:01pm Edited Date/Time 1/12/2024 4:29pm
Brian_Bowles wrote:
I have a 1986 CR125 that o restored. The bike did not come with its ATAC it was removed and a Pro Circuit pipe was put...
I have a 1986 CR125 that o restored. The bike did not come with its ATAC it was removed and a Pro Circuit pipe was put on. Is there something that needs to be blocked?
jeffarakbari wrote:
I called that pro circuit exhaust system I have the same problem with my bike. Somebody took all my exhaust obviously because they're valuable parts for...

I called that pro circuit exhaust system I have the same problem with my bike. Somebody took all my exhaust obviously because they're valuable parts for factory spec or whatnot. Pro circuit discontinued manufacturing the bypass or whatever for it maybe somebody can help both of us

Try DG exhaust maybe they still offer one with thier pipe. 

An atac on the bay 

https://www.ebay.com/itm/256227406077

 

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