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Old 26th July 2016, 11:22   #76
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Default Re: Replacing the KB-RTZ offroad specials - My Hero Impulse

That was a beautiful write-up, Eric. Love how your bike has treated you. I was in the market for a used impulse about a year ago but canned the idea as I needed to direct my finances towards something else. Now, maybe, I can reconsider it all over again. Will call up a few Hero dealers in Bangalore and see what they can do.
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Old 30th July 2016, 20:49   #77
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Default Impulse - advice needed

Dear Tbhpians,

I'm a proud owner of the Hero Impulse, great bike and my upgrade to 200cc makes it even better. Till 100, it is very efficient and it is giving me thorough happiness. However, I am not happy on long rides as the top speed performance is a concern and reliability is bad. I want to know if the bigger Impulse is in plan or should I just plonk in the ZMA engine. If the answer to my first question is no, please advice me on how to upgrade the engine. I am from Bangalore and I would like to know who does a good job and PLEASE help me understand the wiring, exhaust, carburetor etc. No other bike is giving me the happiness of Impulse. Please help!

Last edited by GTO : 1st August 2016 at 13:04. Reason: Typo
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Old 31st July 2016, 00:05   #78
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Default Re: Impulse - advice needed

Hero may not release the bigger Impulse in the near future. Remember reading in the early editions of Overdrive about a mad Impulse. Can't exactly remember the edition month. You can have a look at the Youtube channel of Overdrive.

Regarding the garage, as you are from B'lore, you can try Indimotard. They are the best when it comes to motorbikes. AFAIK they are pretty enthusiastic guys.

Regards

Prasanth Krishnan
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Old 31st July 2016, 13:59   #79
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Default Re: Impulse - advice needed

I'm not sure if you can legally change the motor and have a valid RC and Insurance. Why not try riding the Himalayan? Should suit your requirements pretty well.
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Old 23rd October 2016, 22:03   #80
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Default Re: Replacing the KB-RTZ offroad specials - My Hero Impulse

Replacing the KB-RTZ offroad specials - My Hero Impulse-dsc02885.jpg


Having been given the unexpected opportunity to be out in Lahaul/Spiti around the time of the Raid-de-Himalaya - which must provide one of the most beautiful racing venues in the world - I was happy to be able to witness some of the action at Batal. Good showing of Impulses out there, some plodding along rather painfully but a couple seeming quite well-ridden:

Replacing the KB-RTZ offroad specials - My Hero Impulse-dsc02899.jpg


I'd ridden mine out there last year (not rallying), and can't say that it was really able to "flatten out" and fly along at speed over the huge gravel bits so effortlessly in the way my the old KB125 had (the lighter viscosity shocker oil I've since installed might help it there)... nor did it have quite the power available to urge it on.

At the same time, with the one saddening Raid fatality firmly and soberly in mind these past days, as a man similarly in his late 40's a sub-15bhp bike is seeming a little more plausible than one with four times that power. At Chachu's dhaba in Batal, two days before a certain big-bore KTM would send its rider flying to his demise, I sat with another man in our age category - a Triumph Tiger rider - who was withdrawing on account of an accident that could've been serious: "I was pressing it too hard" he said, "I'd kept ahead of the WR(450) for a long while". Despite the back/leg sprains and a torn-off fingernail and wrecked bike, he was fortunate to be walking away from it and I told him so.

Not saying here that age need be a limiter of dreams, ambition, victories or straight-up fun... just sayin' that for me personally, my slightly modded Impulse is feeling generally strong enough as of late (but I'm still going to get that 'pipe on there when I can get around to fabbing it). Set up / ridden right, they would seem reasonably capable machines.

-Eric

Last edited by ringoism : 23rd October 2016 at 22:06.
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Old 23rd October 2016, 22:55   #81
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Default Re: Impulse - advice needed

Quote:
Originally Posted by IshaanIan View Post
I'm not sure if you can legally change the motor and have a valid RC and Insurance. Why not try riding the Himalayan? Should suit your requirements pretty well.
Well, the Himalayan is an entirely different machine from the Impulse and despite its breaking new ground, for lack of a better descriptor could still be considered very "Royal-Enfield-like" (heavy, bit cumbersome, lots of mechanical noise, etc), perhaps especially for one already experiencing "thorough happiness" on a Hero product.

I've had a couple different RTO's/ MVI's tell me that engine swaps could be endorsed - one inquiry was with respect to the MDI turbo swap for the Marshal, the other was with respect to this Impulzma thing. Other RTO/MVI's may contradict this, of course. Probably a question of interpretation of the applicable laws / the level of cooperative spirit discoverable in a particular office.

Quote:
Originally Posted by RenuKumar View Post
Dear Tbhpians, I'm a proud owner of the Hero Impulse, great bike and my upgrade to 200cc makes it even better. Till 100, it is very efficient and it is giving me thorough happiness.... top speed performance is a concern and reliability is bad
Can you give any details about your 200cc upgrade: who did it, how it's done, what's the cost??? You mentioned reliability issues - What problems specifically?

Thanks,
-Eric

Last edited by ringoism : 23rd October 2016 at 22:57.
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Old 27th October 2016, 18:09   #82
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Default Re: Impulse - advice needed

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Originally Posted by ringoism View Post
Can you give any details about your 200cc upgrade: who did it, how it's done, what's the cost??? You mentioned reliability issues - What problems specifically?

Thanks,
-Eric

Hi Eric, I have used the Karizma piston to upsize the bore and increased the valve sizes to accommodate more fuel inflow and exhaust gases. I have also used the carburetor of Pulsar200 and have put a K&N free flow air filter directly on the carburetor without doing the plumbing works. However, I have not used the free flow exhaust which is the main problem.

The main problem that I am facing is with the clutch plates which burns at about 1000 kms of run. The power delivery is excellent but my mechanic says that the clutch plates are not able to take the increase in power. He was saying that upgrading to fiber clutch plate will resolve the issue. I request you to help me with the clutch plates and exhaust please.
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Old 30th October 2016, 15:39   #83
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Default Re: Impulse - advice needed

Quote:
Originally Posted by RenuKumar View Post
Hi Eric, I have used the Karizma piston to upsize the bore... However, I have not used the free flow exhaust...The main problem that I am facing is with the clutch plates which burns at about 1000 kms of run. The power delivery is excellent but my mechanic says that the clutch plates are not able to take the increase in power. He was saying that upgrading to fiber clutch plate will resolve the issue. I request you to help me with the clutch plates and exhaust please.
AFAIK, the Karizma's bore is 65.5mm, and the 150's is 57.3mm. Did you have to re-sleeve the original cylinder to accommodate the 8mm increase, or was this a direct overbore? Also the 150 has a dished piston crown, whereas I think the Karizma's is a flat-top - if I calculate correctly, that would with the overbore would raise compression ratio from stock 9:1 to 12:1, which is generally going to call for especially high-octane petrol. I could probably get away with that CR up here at 7,000+ft (rarified air), but nearer sea-level, have you had any detonation ("pinking") issues? I'd thought to shim up the cylinder block a couple mm's to help correct this. Also wondering if you noticed any more vibration at any rpm, as the Karizma piston is much heavier than the featherweight 150's. Lastly, I'm guessing you had bushings fabricated to adapt the original piston's small wrist-pin to the larger pin bores in the Karizma unit? Was that your bike's mods I saw detailed on xbhp?

Re: the clutch I'm a little surprised you're having that much trouble, unless you're in the habit of "half-clutching" (which should definitely be avoided in normal riding). Don't know what options are there for disc materials, but along with (or instead of) that I'd think about simply installing stiffer clutch springs - effort on the handle will be higher, but if you can handle that, it'll definitely reduce slippage/heat/wear/failure. You could bring a stock spring with you to whichever industrial supplier and ask for something with a slightly larger wire diameter. I can't remember whether the Impulse has four or six springs, but anyway I'd expect this to be a big help.

Re: the pipe, the stock one has a very small ID in that primary bend, and must be very restrictive; the stock silencer also creates a lot of backpressure (you can feel/hear it being forced out the condensation drain hole), and I'd expect substantial performance gains with a free-flowing upgrade. Eventually I'll probably fabricate at least the silencer ("can") portion myself, straight-thru with perforations and stainless wire mesh and maybe some ceramic fiber packing inside for noise-control. I suppose some off-the-shelf item should also be easily enough adaptable. The front portion of the pipe is the harder part; might try making one of those too, but the bending will not be easy without a mandrel type setup, especially if I'm doing it with stainless. There are some juggad type tricks for this that may or may not work. None of this is probably going to happen before next Spring, but I'll let you know if/when I get something worked out.

Thanks for your info/inputs and happy motoring,

-Eric

Last edited by ringoism : 30th October 2016 at 15:44.
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Old 30th October 2016, 22:50   #84
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Default Re: Impulse - advice needed

Quote:
Originally Posted by ringoism View Post

Re: the clutch I'm a little surprised you're having that much trouble, unless you're in the habit of "half-clutching" (which should definitely be avoided in normal riding). Don't know what options are there for disc materials, but along with (or instead of) that I'd think about simply installing stiffer clutch springs - effort on the handle will be higher, but if you can handle that, it'll definitely reduce slippage/heat/wear/failure. You could bring a stock spring with you to whichever industrial supplier and ask for something with a slightly larger wire diameter. I can't remember whether the Impulse has four or six springs, but anyway I'd expect this to be a big help.
Locally made springs is something I've learned to be very wary of.

Regards
Sutripta
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Old 6th November 2016, 19:27   #85
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Default Re: Impulse - advice needed

Quote:
Originally Posted by Sutripta View Post
Locally made springs is something I've learned to be very wary of.

Regards
Sutripta
Probably with good reason - but I wasn't suggesting "locally made" in the sense of low-grade desi. Some industrial suppliers in India have good quality stuff available, whether imported or those of well-produced domestic manufacture. Every new car/bike in the land is full of domestically-produced springs of widely varying types / sizes.

In the case of a motorcycle clutch, worst-case scenario if something low-grade was fitted would seem to be a spring breaking... which wouldn't cause any kind of catastrophic failure / damage the way a bike clutch is configured. It'd probably just start slipping.

-Eric
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