A7 Exhaust pipe fit - do I persevere??

[900triple]

Hi all,

Question about the fit on my A7 exhaust pipes. The step inside the head to the outside is around 22mm but even afetr giving the ports a good dremel/clean I can only get the pipes in to a depth of approximately 15mm. And its a tight fit at that.

Is this enough or do I keep at it to get the full penetration (keep the answers clean please)??? The pipes are second hand but good condition.

Cheers

Alan

[Butch (cb)]

My original pipes are stepped down very slightly to fit into my iron head 650. The Armours replacements that I bought are not and consequently don't fit. There's not much in it, but I'm certainly not going to mod my head to make their crummy pipes fit.

[Goldy]

The real question is do they leak if not I would leave them at that. Exhaust pipes are a real problem. I would suggest that of all the parts that are now re manufactured exhaust pipes are the ones most likely not to fit. C and D stopped selling them, I bought mine from Wassell because they are not foreign imports, but they still did not fit because the mounting bracket was not in line. All the best Goldy

[iansoady]

It's worth checking that the pipes are round not slightly oval.

I use ordinary household silicone on exhausts as it doesn't burn, is soft enough to take apart easily and sems to seal well.

[900triple]

It's worth checking that the pipes are round not slightly oval.

I use ordinary household silicone on exhausts as it doesn't burn, is soft enough to take apart easily and sems to seal well.

Interesting...the pipes are slighty oval but not too much - 0.2mm

What sealant do you use? I've never heard of that solution before and would be up for trying it. Assuming that you smear it on the exhaust port bore then put the pipe in???

[Butch (cb)]

Yeah - Armours told me that mine might be oval. No they were over sized. They were prepared to change them is they were oval, but not if they were the wrong size.

[Pilgrim]

Hiya,
Just adding my bit.
Halfords do a high temperature copper silicon sealant,
LOCTITE 5920. I think it's around £6 but it works well
on any joints especially the exhausts. Just smear it inside the
head and push the pipes in.

[900triple]

Hiya,
Just adding my bit.
Halfords do a high temperature copper silicon sealant,
LOCTITE 5920. I think it's around £6 but it works well
on any joints especially the exhausts. Just smear it inside the
head and push the pipes in.

Brilliant - thanks

[iansoady]

What sealant do you use? I've never heard of that solution before and would be up for trying it. Assuming that you smear it on the exhaust port bore then put the pipe in???

Just use something like this


And yes, just smear it round the inside of the port. Any that squeezes inside will burn off but the rest will still seal well.

I've never felt it necessary to use the special stuff but then I'm a cheapskate.....

[t20racerman]

Hiya,
Just adding my bit.
Halfords do a high temperature copper silicon sealant,
LOCTITE 5920. I think it's around £6 but it works well
on any joints especially the exhausts. Just smear it inside the
head and push the pipes in.

I use this stuff on both my Classic race bikes ('67 T20 Suzuki and TZ350 Yam). The pipes on those are loose (held on with springs and a rubber mount) and get heck of a battering. It works a treat. Well worth the cost.

I'm having similar problems with badly fitting pipes on my A10 (small part of siamese too narrow and so comes loose) and after trying other solutions like welding a band around it, I'll be using this stuff after I've put the rocker cover back on.  Normal silicon sealer is pretty good too though on most things and worth a try.