Carb not running right. Missing kerker baffle?

I'm rebuilding a 1979 sr650. I've taken the carbs apart and cleaned them. Also did a carb synch and everything looks good. The bike fires up easily with only 10k miles. However it hesitates a bit on the road with no power. My kerker has no baffle at all but sounds bad ass. Could that be the problem? What is the cheapest remedy for some back pressure? I really don't want to spend $150 on a baffle.

I see you have pods. Have you gone through the rejetting drill? Ed

I made my own baffle. Went to the local metal supply store and bought a scrap piece of expanded steel. I rolled in around some put pipe I had laying around. At the time I didn't have a welder so I used washers and rivets. I measured down the pipe to get a length. Cut a round piece of sheet metal cut a matching sized hole in the center. Stuck the rolled expanded steel through the center, flared it out and riveted it to the sheet metal disc. I had the original Kerker end cap so I riveted the other end of the expanded steel roll to it. I then bought so FMF 4 stroke exhaust packing and wrapped it around the expanded steel roll. I work really well and sounded great. You have to replace the packing every now and then.

Unless you put in bigger jets in those carbs, you're not going to get the performance you're looking for. Not having a baffle is going to make it run even more lean.

Britome wrote: I'm rebuilding a 1979 sr650. I've taken the carbs apart and cleaned them. Also did a carb synch and everything looks good. The bike fires up easily with only 10k miles. However it hesitates a bit on the road with no power. My kerker has no baffle at all but sounds bad ass. Could that be the problem?

Straight pipe + pods = runs terrible.

duplicate

Your pipe looks like the one I ran for abut 25 years. There is an easy way to make a good baffle like the one mine had.

Use a steel tube (about 1' diameter) that is "swiss cheese" drilled with holes from end to end. Weld a block wall in the tube 1/2 way down the length. Weld round plates on each end so that when it is inserted in the pipe, it seals at each end. The exhaust is forced to go inside the front section of the tube then expands out into the pipe chamber and goes back in the second section of the tube to get out. Mine worked great, was a bit loud for my taste but was all steel so never needed any packing or service.

Find just the cone for the end of pipe, it helps a lot.

650ed wrote: I see you have pods. Have you gone through the rejetting drill? Ed

Obviously not. What drill would that be? Where do I get them?

By rejetting drill I was referring to the exercise of trying to discover the best jetting combination to try to make your bike run as well with pods as it would normally run with the stock air box. This "drill" consists of buying jets (possibly needles) trying different needle clip positions, etc. until one stumbles on the combination they can live with. You may want to use the search engine on this site and insert the word PODS. At last count there were more than 7,820 postings on the subject.

See www.kzrider.com/forum/4-electrical/59374...-stay-running#633806 for details.

Ed

Ok. Thx. I was hoping that there were time tested Jett's that I could buy.

Dynojet may have a carb kit that includes jets and jet needles designed specifically for the bike at hand to achieve better performance with pods throughout the entire carb range from idle to wot.

But the performance with pods will likely never be quite as good as the stock air box throughout the entire carb range.

That's one of the downside issues with pods. Possible to tune for good carb performance at idle OR mid-range OR wot, but not all simultaneously as well as when using the stock air box.

Where the stock air box isn't an option, carb tuning with pods may be even more difficult with CV carbs than with manual slide carbs.

And beside carb tuning difficulties, there are several other downsides to using pods.

Admittedly, some folks like the look of pods. But others find stacks even more attractive.

Good Fortune!