ZX9R B1 DOWNPIPES/END CAN OVERHEATING VERY QUICK

[faith183uk]

Hello all,

I have a 1994 ZX9R B1 model. Being a kawasaki my downpipes were completely rusted through and falling apart.

I was still running the originals and the standard factory end can. As i needed to replace the downpipes i thought i would change the can at the same time.

After looking around Ebay,mcn etc the pipes were going to set me back £200 - £250 and a decent can about the same again.

In the end i opted for Motad Stainless steel Downpipes (MOTAD not MICRON which i know are poor for the money) and a custom made straight through race can for a nice deep sound.

Since having this done, my exhaust, both link pipe and can get bloody hot within 3-5mins of riding. The temp. must be in excess of 120 Oc.

The temp gauge on the bike is running as normal.

I was told that due to me changing the carbs and the are not in sync, this is causing the overheating of the pipes and can?

Any ideas?

Thanks in advance

[sickpup]

[Ichy]

Just something I've noticed. Aftermarket exhausts are generally made out of thinner walled tube, this could cause it to heat up quicker although the general temperature should be similar.

[Kickstart]

[faith183uk]

Thanks for the responses its much appreciated.

Micron downpipes, i worded it a bit wrong, i meant for the money the local shop was asking i believed it would have been a poor choice. I didnt mean to suggest that micron pipes were poor in general - my mistake, apologies.

The carbs were changed for another pair purely for the fact the last ones where leaking and shot and i had a new set from the later B3 model. The only difference is the B3 carbs have a heating jacket where as the B1 doesnt, nor does it have the take off points from the radiator to fit one.

So in this case the carbs are still running the oringal jets.

Thanks though for the replies, i agree that the bike must be running lean to account for the temp. I had a quick spin on it the other night and tested the temp on the link pipe. 194oC. so i was a little out with the 120oC

So if its running lean whats the next step. Re jetting the carbs?

[pipnet11]

[Kickstart]

Hi

Yes you will need to rejet, and likely need someone with a dyno who knows what they are doing.

The Dynojet kits are a good starting point, but they are not just a lob on and forget item. You need to make the right choice of needle jet position, main jet, etc.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[faith183uk]

Good stuff, i will book it in with PDQ this week. In the mean time i will not ride it.

Thanks Kieth and the rest of you for all your help. Its appreciated.

[faith183uk]

Oh just one more question.

I take it the 2 foot flames out the end can at high revs again is due to it running lean?

[Kickstart]

Mmmm, maybe, but sounds more like rich.

Also check for air leaks in the exhaust. Make sure you use new exhaust gaskets and check the joints are sealed.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing