New brutale 1000rs chain slack noise?

593 Views 30 Replies 6 Participants Last post by mv2envy, 9 d ago

ArabianOak

Discussion Starter · 29 d ago

Hi Gang,

Out riding today and starting noticing what sounds like chain slack or chain slap noise on decel in the lower rpm range...70 miles on the bike so far...sometimes its really noticeable on decel in the lower rpm and sometimes it's not...what concerns me is that it doesnt seem to happen with the clutch pulled in but I also know the tension would be gone in the gear too when the clutch is pulled in.

anybody else experience this? should I adjust the chain at such low mileage? I know they initially stretch but I thought it would be a few hundred miles to do that too.

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ArabianOak

Discussion Starter · #21 · 9 d ago

mv2envy said:
It’s a fully open catless exhaust with now with no baffles. How in the hell do they think no tune is needed? Jesus. Now I’m really going to put people off of giving them money!

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ArabianOak

Discussion Starter · #22 · 9 d ago

Sooo, do I demand a tune update??? Lol

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silentservice703

· #23 · 9 d ago

No. You take the bike to a qualified Dyno Tuner and have the machine tuned.

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mv2envy

· #24 · 9 d ago

silentservice703 said:
No. You take the bike to a qualified Dyno Tuner and have the machine tuned.

One small problem with that. A dyno tunner isn’t going to be able to tune the map on the new gen B4’s. The bren flasher only allows bren to load maps. It’s not like ECU Studio where any tuning shop can access the map and flash at will.

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mv2envy

· #25 · 9 d ago

ArabianOak said:
Sooo, do I demand a tune update??? Lol

Write back to them explaining that the link pipe in this case eliminates the cat, baffle and exhaust Servo valve of the original exhaust making the entire exhaust open and free flowing from headers to tailpipe like a full race exhaust system. Then ask them to explain why they feel a bike with factory restrictive exhaust with cat and exhaust servo gets the same map as one without all of those restrictions in its way.

maybe they don’t realize what exactly that link pipe accomplishes on this particular motorcycle. Include pictures of the box this link pipe is eliminating.

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silentservice703

· #26 · 9 d ago

mv2envy said:
One small problem with that. A dyno tunner isn’t going to be able to tune the map on the new gen B4’s. The bren flasher only allows bren to load maps. It’s not like ECU Studio where any tuning shop can access the map and flash at will.

That’s what I was told when I bought my 312R about the 5SM ECU….Then I found Rob’S Dyno and the rest was history. It just takes someone willing to put in the work and put up the money.

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mv2envy

· #27 · 9 d ago

silentservice703 said:
That’s what I was told when I bought my 312R about the 5SM ECU….Then I found Rob’S Dyno and the rest was history. It just takes someone willing to put in the work and put up the money.

Ecu studio does show support for the current gen B4 but it shows out of stock.

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MartinBrutale1k

· #28 · 9 d ago

mv2envy said:
Write back to them explaining that the link pipe in this case eliminates the cat, baffle and exhaust Servo valve of the original exhaust making the entire exhaust open and free flowing from headers to tailpipe like a full race exhaust system. Then ask them to explain why they feel a bike with factory restrictive exhaust with cat and exhaust servo gets the same map as one without all of those restrictions in its way.

While i agree a tune seems necessary calling an exhaust replacement with a link pipe catless might not be correct. I didn't took home my OEM manifold yet but the cat seems to be ahead of the big "silencer box". Made the error myself until pointed to me by a friend.

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ArabianOak

Discussion Starter · #29 · 9 d ago

Good eye @MartinBrutale1k

I told Bren what others mentioned as well. His response below…

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mv2envy

· #30 · 9 d ago

MartinBrutale1k said:
While i agree a tune seems necessary calling an exhaust replacement with a link pipe catless might not be correct. I didn't took home my OEM manifold yet but the cat seems to be ahead of the big "silencer box". Made the error myself until pointed to me by a friend.

View attachment 503473

I stand corrected. But I still feel the map needs modifying.