Converting Scram 440 to Himalayan 440!

[taus90]

For a while i was under the impression that scram 440 wasn't worthy enough to upgrade if you already have 411. Well that's true to some extent for BS3 and BS4 variant with big bore kit and red box. But for BS6 411 with fused TB/ECU thats not the case, coz it's really difficult to squeeze out performance from bs6 himi with big bore kit and justify the price. So I had made my peace with the fact that I will just go along with HT cam, Perf exhaust, bmc AF and fuel x pro and call it a day. coz going by the reviews for 440 i didnt see there is any performance upgrade over 411, little faster acceleration but same top speed and the NVH level has reduced thanks to its 6th gear.

But here is the catch I test rode the bike yesterday and immediately felt the smoothness and zero clattery mechanical noise that 411 engine is famous for. and also found out that 440 uses smaller front sprocket to improve the bottom end further.

So here I am (@sam2019 can he help and guide me through this if its just FOMO at this point). thinking of getting Scram 440 Trail variant and upgrading it to Himalayan 440. Get the Side cage, mount the headlight to it. Change the front rim from 19" to 21". Not sure about the front fork it has 10mm less travel probably due shorter spacer that can be swapped too.

PS. I havent updated my HIMI2022 ecu to the one RE Released at the launch of scram 411, which many users reported improved NVH and throttle response.

 

[sam2019]

None of the stuff you want to do interests me. I am quite happy with the 440 as is. I did not realize that part of the more torqy feel (is that a word??) comes from a smaller front sprocket (I consider that cheating if true - havnt checked though). I CAN say that the 440 gets to 110 in way less time than a 411 and to 125 eventually - a speed my previous 411s all really struggled with. Of course the 477 and 500 BB kits solved that problem for me.
I would never go back to 21 front wheel simply because I value tubeless WAY higher than spokes. If you ever had a flat in the mountains you know why.
What I will do once back from my south india trip is throwing a 477 BB kit on the 440 along with the fuelx pro+ and run the hot ECU burn in thing to see if the stock ecu does work with 477 as well. if so that would be a great upgrade path for the 440s out there.
I will also buy a used 411 scram and put a 440 cylinder on it plus the fuelx pro I have lying around (from my last Hima that I sold) and do the same ECU burn in. Then see how that works. If it does it may be a valid upgrade path for all the 411 out there that are not willing to shell out the cash for a 477 plus PT4.

 

[taus90]

Yes! that torqy nature of the bike is due to smaller front sprocket 14t, Himi 15t. head internal has been tweaked as well.

Ok so after posting the OG post I went back to RE again to test ride 440. I dont know why this happens, none of the mechanic has been able to answer this phenomenon. My 2022 himi stock except for 16t front sprocket is bone stock, someday the engine runs like a tractor all rattly and noisy. and on some day's like today runs buttery smooth zero mechanical noise only exhaust note. and my himi was on par with the NVH level of 440.

As for the tyre choice, I m other way around, I used to swear by 19" as perfect size but 21" on a right bike makes a lot of a difference in terms of confidence for me. As for the tubeless option, I have done tubeless conversion for 540INR for my Inti650 15000km no issues. Iron rims of himi is not ideal for tubless conversion, hence got H450 aluminum gold excel rims from for dirt cheap from someone who was upgrading to cross spoke.

But coming to topic, my main interest with 440 is the upgrade path that you mentioned, I assume "dont quote me on this" but 440 ecu should be able to handle 477 BBkit without any effort no need for PT or FX.
and the 6th gear that is overdrive, probably will end up being1:1 (currently 0.890:1) when paired up with 15t sprocket.

 

[sam2019]

Yes! that torqy nature of the bike is due to smaller front sprocket 14t, Himi 15t.

that is indeed strange. a smaller 14 sprocket should give me more torque in low speeds but should also reduce the top speed when compared to 15. However the opposite is the case. top speed is higher and reached faster (in 5th, I think 6th is just to save fuel on touring).
Of course would the engine have more power overall that could explain it but officially its just one puny HP more.

 

[taus90]

technically top speed on 440 and 411 is almost same. if 440 users swap to 15t sprocket they will relatively be able to cruise at 120kmph around 5k rpm* without sacrificing any acceleration, cause for 440 34nm arrives at 4000rpm vs 32nm at 4250rpm on 411.