hi. i'm back. my s 40 does act like it is misfiring at just off idle. it gets better after warm up. i have been reading about the white spacer, number 4 washers etc. did the s 40 run like that off the show room floor? and if so, why did they not fix it? mine also has a slight backfire when i turn off the bike. any comments? thanks to all that have offered help, Roddy

1st, I'd clean the carb.
Your hesitation maybe a clogged main jet.

thanks for the info. seems like buyers would pregnant dog to hi heaven with a new bike that stumbles like it does. i will try your fix and thank you again for the info....ps the seat is a little short haha

Gary_in_NJ wrote on 11/18/19 at 09:47:42:


Just observation there, Chief. In stock form it takes about 2-3 seconds or 5-6 rotations to get a Savage started, and it's not at all difficult to drain that big battery if it's having any trouble at all getting going. After stage 3 mods it starts after just one rotation and I'm using a battery 1/3 the size (the battery specified for the Raptor) on my bobber builds. Suzuki engineers must have spec'd that gargantuan hunk of lead and acid for some reason, it's not as if the electrical system on an S40 is complicated or demanding in any respect. I understand what you're saying as I have an Associates and Bachelors in Electronics, but the only reason that battery has to be so big is for capacity since the starter has to spin the motor gratuitously to finally start in the very poorly jetted stock form. Get the engine tuned correctly and the need for all that reserve capacity evaporates.

Let's stay on message.
For those that can, take a ride.
For those that can't, Easy rider.

hi. thanks for the message. my bike has 5600 miles and it's a 2012. no modifications. carb was rebuilt by the seller 2000 miles ago. there are no marks on any boltheads indicating to me it has never been worked on except for a new tire and oil filter i ride on both hiway and streets. the misfiring is tolerable but if it can be easily fixed, i'd like to apply it to my bike. thanksagain, roddy

Gary_in_NJ wrote on 11/18/19 at 11:58:00:


***************************

I'll use smaller words with fewer syllables...

Stage 3 means unrestrictive intake, unrestrictive exhaust, and requisite jetting. Pretty much everything one can do without opening the engine and changing the innards. I'm aware of the differences between old school lead acid, SLA, AGM, Gel, and Li-Ion batteries. I like Anti-Gravity batteries very much but that price tag can be tough for some customers to swallow, especially with a budget build on a budget bike.

Anyway, back on topic - a properly breathing, freely exhausting Savage starts so much more quickly and easily than a stock bike, so less reserve capacity is required. Voltage is strength, cranking amps is stamina. No need for so much electrical stamina when the engine doesn't struggle to start. You claim the Suzuki engineers spec'd such a large turd of a battery because of the size of the starter, windings, etc... But that makes me wonder how my 1700cc Nomad starts with essentially the same size battery when it has to run an ECU, a servo-driven throttle body, a fuel pump, two injectors, and a starter capable of spinning two cylinders that are each 200cc larger than the S40's...and the simple answer is, in stock tune the S40 is a battery killer. If it wasn't for how well this bike responds to mods and how easily the chassis can be customized, I'd absolutely hate it. It's quite frankly a terrible motorcycle right out of the box. So while you see no correlation between battery capacity and jet sizes, there very much is in this case.

Comparing a Nomad to the  Savage ?     Any bike with more than one  piston is going to require a smaller battery(depending on other needs) , the piston in the Nomad may be of larger displacement , but  the stroke is usually shorter , or the closing of the intake valve maybe earlier , making cylinder pressure much lower at cranking speeds ,even more so if the cam shows any overlap , the Savage has no overlap.  Show me the decompression releases on your Nomad , it has none,  that should give you  your first clue. Tuning your carb hasn't much to do when starting the motor (cold startup),  when choking the carb,  the quantity of fuel/air mix is more important than the quality. Your carb isn't tuned when the choke is pulled out , it's flooding the combustion chamber in hopes that at least some of the fuel will mix with air and produce a spark ,where most of the fuel will be in contact with the cold combustion chamber,  piston and cylinder walls and will be condensed .