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Old 4th June 2010, 14:27   #1
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Default Converting Light Crank to Heavy Crank in Royal Enfield Standard Bullet 350 1996 Model

Hi Fellow Teambhpian's,

I have a 1996 royal enfield standard bullet 350 with light crank. I would like to change it to heavy crank. I would like to know from all the experts what would be the cost involved in doing so, what major modifications needs to be done to the engine if i change from light to heavy crank?

Will the above modification affect the existing mechanicals of the bike? if yes then which all parts needs a change and what would be the total cost. I would also like to know the weights of light and heavy crank. I think heavy crank comes in two weights i.e. 14 kg for the 60's bullet and 12.5 kg for all the other heavy crank bullets, let me repeat i am not very sure about this but you guys can help me out fix a heavy crank on my bullet.
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Old 4th June 2010, 15:05   #2
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I'm not really so technical but why do you want to do this mod? What benefits will it offer?
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Old 4th June 2010, 19:44   #3
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Heavy crank lets you do dug dug dug at 30 km/hr on fourth gear, even climb a hill on the same gear!!! Not for those who worry about mileage...

Last edited by Leepower : 4th June 2010 at 19:55.
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Old 5th June 2010, 03:28   #4
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I doubt you'll need any modifications. I've heard that the new models (2006 onwards) started to come with cranks as heavy as the older models. I'm not sure but my '79 Standard 350 probably has a crank lighter than that of a 2006 Electra.
You might want to look into that. I'm guessing that price of a brand new crank should be around Rs 2500 or so. Again, not sure.
If you change the crank, you might want to change over to SKF bearings which are of better quality than most 'genuine RE' bearings unless you were lucky enough to have them already. I'd replace them anyway.
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Old 5th June 2010, 07:49   #5
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I my understanding there are two ways to get this done:

1. Retro fitting a new/old heavy crank
2. Welding on a thick iron flat onto the existing crank's circumference and a milling job to clean it up.

My 97 Machsismo had the latter done done some 11 years back and is still running sweet. the bullet can chug at 20-25 kmph in 4th gear without knocking.
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Old 10th June 2010, 20:39   #6
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Default Where can i source a Heavy Crank for Bullet in Mumbai and for how much price

Hey guys plz suggest me a place in mumbai from where i can source a heavy crank and at what price?
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Old 10th June 2010, 21:24   #7
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Hey navin,

You can get this change done easily, without any modifications. Just get an old crank from some scrap market around your area & find a decent mechanic. It does not require any special talent, just find a mechanic who can rebuld an engine well & you are good to go.

I am not sure about the exact weights, would have to confirm with my mechanic(s) but then the lighter cranks which were available in between for some time were around 3 kgs lighter than the heavier ones. Also the cranks around 1960s were even heavier if I remember correctly & somewhere in 70s, RE had reduced the weight. The last heavy cranks were of of this second generation (from 70s).

Happy thumping.
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Old 10th June 2010, 23:27   #8
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The internals of the crank case were different above all navin why do you want to make this change?
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Old 11th June 2010, 00:20   #9
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Quote:
Originally Posted by desideep View Post
The internals of the crank case were different above all navin why do you want to make this change?
Desi, can you elaborate a bit more on this.
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Old 11th June 2010, 13:37   #10
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heavy cranks were taken off the bullets near 1985 or 1990 if i know correctly, correct me if i am wrong. The weight was reduced to 6kgs or something. Then near the closure of the STD 350 engine, RE increased the weight of cranks after feb 2009 and the cranks now weigh around 10kgs. So the bullets after 2009 and till date are of heavy cranks. Even my bull does 30km/h easily in 4th gear. But the question is not of what slowest speed can you achieve with heavy crank. the question is that are you putting unnecessary pressure on the engine ?

just make sure you do the rebuild very carefully.
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Old 11th June 2010, 13:44   #11
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I Have a 78 STD 350 and a 99 Machismo 350 with CI engine.
The 78 is the heavier crank and it can putter at 10km\hr in 3rg gear and without any hiccups.
I am not aware of technicalities of the mod.
but if you can pull it off,it will be worth it.
Royal enfield also used to Sell Std 350 with a heavy crank recently due to market demand.
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Old 11th June 2010, 13:50   #12
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Whats the problem with puttering around on a lower gear?

Can you elaborate why you want to go heavy crank?
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Old 15th June 2010, 22:26   #13
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Default Light Crank to Heavy Crank Reasons

The reasons for heavy crank are many but some of them are:

1. Frequency of changing gears is less
2. Can easily chug at less than 20 KMPH in 4th gear
3. Engine revvs less thereby throttling less and engine wear and tear reduces
4. Better torque from standstill(Awesome Pulling power can literally be felt on upward slopes)

but still the question remains any modifications to be carried out while changing from light crank to heavy crank? come on bulleteers where are your suggestions
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Old 16th June 2010, 14:16   #14
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Default electre with heavy crank

hi guys ,
it is possible to replace bigger crank in 350 std.

we have one Electra with bigger crank.
the part circled in pic is replaced of the heavy crank with Electras crank.
Name:  CRANKSHAFT 570612cc.jpg
Views: 53874
Size:  77.9 KB
my mechanic had only 2 heavy cranks one of which is used on the Electra & other is kept by mechanic for his personal use.

dose any one know where to find the new older model cranks?
what cost ? (new/old)
i have heard that 500cc & 535cc ones use heavy cranks, is it true?
Quote:
just found a link.
Name:  HEAVY DUTY OLD MODEL CRANK.jpg
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Size:  95.2 KB

Last edited by jeepster : 16th June 2010 at 14:20.
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Old 16th June 2010, 19:05   #15
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See above Jeepster has Answer the question BlackFIRE_9. The the crank ends are different and then in the newer crank cases you have to bore the crank case to make this one fit at the bottom. this is what we was when we recently made those changed to my Bullet that can been seen in my other thread. in my 1977 bullet the crank was the light one. and i have confirmed with the my mechanic that after the 1975 bullets there were no heavy cranks given out brand new till recent past.

And my bullet used to chug fine at 20-30 in the 4th gear.
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