Well I guess john1652 and I just got lemons or something??? Mine is an 06, 152main , 55 pilot ,full spacer with full spacer, KN drop in and Jardine muffler. I has no pops or backfires. Plug is light gray. 55mpg. Acelerates like a rocket. No clutch slip and without a tach I don't no what the RPMS are at 80 but she is wound real tight and the throttle has been wound as
far as it will go for a while with no more pick up in sight.
There is no slop in the throttle cable either. I have been riding and building bikes for over 40 years so I now I haven't missed anything. The very first post I ever put up in November was about no top end on my bike and that was why I wanted to go to chain drive. Like I said I  drag raced a 1200 Sporster and stomped it until 70 mph. Other people said they could only beat 883 Sporsters up to 60mph. That is why I'm out of top end faster, all I have is sheer take off. No top end. It is geared like a drag car. The farthest I have ever drove it was 10 miles on the interstate, and I had to keep it down to 60mph so it wasn't just screaming RPMS like when I pushed it to 70+. Haven't been on the interstate since. When I'm in 5th gear at 55-60 and back off the gas it doesn't slow down gradually, it backs down like it is in 4th. I can be in 5th and hit the gas and it will take off with about the same aceleration as any of the other gears but is wound tight at 80MPH. Your guess is as good as mine. I don't know how much John weighs, but it sounds like his 07 is like my 06.

verslagen1 wrote on 12/31/69 at 16:00:02:



Handy little device, isn't it?

I really think that a properly adjusted windshield makes a big difference here too.

verslagen1 wrote on 12/31/69 at 16:00:02:
 

Believe me I know it is in fifth. Kinda hard to be that stupid with over forty years experience at bike and hot rod building. The Royal Enfield 500 single I have will cruise all day at 70-75 and isn't working half as hard(RPM) as the Savage. It just takes a lot longer to get there cause it is only 22 hp and is geared different. I think it was Smokin_blue that said they changed gear ratios when they went to five speeds. I am just wondering if they did it again when they started calling them S-40 Boulevard's, cause that is all mine is good for,riding on the back roads and city streets, forget riding any distance at 75-80on the interstate. the only way it would hit 100 is the plane drop method. When I'm on the interstate(once) the semi's were passing me, and I thought I was going to cause an accident from obstructing the flow of traffic.  I have a 67 Royal Enfield  750 Interceptor 4 speed and broke the speedo cable at 120mph. I also have a 100hp plus custom, 6 speed bike and it will do 130+. I wish I could take the sixth gear out of it(who needs it when you can do 100+ in fifth) and put it in the S-40. Every time I ride it I find myself trying to shift into a non-exsisting 6th cause mine needs it. That's how high it revs at 70.

Hutch wrote on 12/31/69 at 16:00:02:

It sounds like you're lacking on the top end. Mine happily pulls very hard to 80 and has plenty more left. You're only running a 152 main jet which may be the reason yours isn't better on the interstate. If you went up a size or two on the main jet, you'd probably find that lost top end power.

Hutch wrote on 12/31/69 at 16:00:02:


Yeah, it is lean, and I'm even wondering if the Savage/S40 will survive the next round of EPA (i e. California) Standards when they go into effect.  The Savage is one of the last of the carb types and it is air cooled too.

Suzuki might eventually eliminate the S40 just because they can't improve it any further without fuel injection or liquid cooling...or maybe in 10 years we'll be discussing reprogramming the PCM with a new fuel profile instead

I doubt they changed the porting on the late models but I suppose they could have altered the cam timing for emissions. Compare your bike's performance to similarly modded bikes.

Changing the main jet is pretty easy and inexpensive. I'd go up 2 sizes (157.5) and give it a test ride. You might be surprised. It's easy enough to go down to a 155 or return to your 152.5.

Mine is turning some rpms at those speeds, no doubt. But is does have some power.

Just what is the factory rated hp and redline for a 06
S-40. Every where I look on line it doesn't have it for anything newer than a 04, and all are different. They didn't bother putting it in the manual. I know most sites give 28-32 for hp, but not much on rpm. To me with all the years of working with bikes and hot rods it sounds about like 5500-6000 rpms when Im' maxed outat 80mph. If I am at top rpm ,then it is not the carb and lack of fuel, it's the gear ratios., and they change something somewhere. Maybe it is cam timing or something else. I know the way this thing  accelerates it is great for 1/4 mile and not much else.