Honda VTR backfiring?

baldzone · 3 May 2006 at 19:15

I have a Honda VTR with Remus cans on it (road legal).

Ever since I've had it there has always been a tendancy for it to bang from the exhausts.

I've tightened up all the clamps on numerous occasions. If I tighten any more I'm eitehr going to round the bolt heads or break something!

Is there any way I can cure this?

milgo · 3 May 2006 at 20:18

(edit)
ignore me didnt know it was a bike

Shoei · 3 May 2006 at 22:39

Is it back firing on the over run or just doing it regardless?
Mine would pop and bang on the over run when i had MIG cans fitted, was great for making pedestrians jump

Mine was fitted with dynojet kit and a K&N and run a bit on the rich side.
Could be that the carbs need balancing or that its running to rich.

For lots of help with VTR's try Revolution, what Roger doesnt know about VTR's can be put on the back of a stamp.
VTR mailing list on Yahoo is another good place.
And this VTR forum is also good for info.

Robb - ex VTR owner.

Freefaller · 4 May 2006 at 07:57

Nothing wrong with overrun popping!

Shoei · 4 May 2006 at 08:28

Freefaller said:
Nothing wrong with overrun popping!

Kill switch back fires are even better on the VTR, oh the joys of huge big carbs

Robb

Lowe · 4 May 2006 at 09:17

Just for interest/reference, small popping backfires on over-run are due to the mix being too lean, whereas huge shotgun type backfires show a slightly too rich mixture.

Rilot · 4 May 2006 at 09:30

The first thing to do is get it on a Dyno and have it fuelled correctly. Ideally you should have had this done when the cans were replaced.

lukechad · 4 May 2006 at 11:06

I was told that that wasnt needed with a can, only if full systems were fitted. :confused:

Is this just because I am running an IL4 compared to a V-twin or have I been told wrong?

rscosworth · 4 May 2006 at 11:10

IMHO all V-Twins ive owned have popped/banged when on overrun, especially with after market cans.

I have the same with my current SV1000S with CCC cans on it, good for making pedestrians jump and car alarms to go off

Rilot · 4 May 2006 at 12:04

lukechad said:
I was told that that wasnt needed with a can, only if full systems were fitted. Is this just because I am running an IL4 compared to a V-twin or have I been told wrong?

They are half right. You can get away with not changing the fuelling if you just replace the cans but it is mandatory if you replace the system. Not changing the fuelling when you change the cans will result in you not getting the full benefit of the freer breathing pipes.

The fact of the matter is; that any change to exhaust back pressure will require that the engine be set up to mirror the changes.

baldzone · 4 May 2006 at 17:03

This is extreme shotgun overrun backifiring. Sounds awesome in tunnels but I work at an airport and am expecting to be shot if it does it near the old bill!

The cans were put on before I owned the bike. The plugs look healthy when I take them out for a service so think the fuel mix should be good?

May well take it to a dyno place and see what the results are.

Many thanks for the info guys!