14/53 Sprocket Conversion Mod Explained

[xotoby]

(30/10/2010 06:36)xotoby Wrote:  couple questions
does the figure sir.b claimed to be the multiplier to work out your correct speed apply to all speeds?
(0.8082?)

Quote:- Your engine and gearbox will have approximately 18% less life.

how is this worked out and what is the expected life of a 1990 rr anyway?

bump to the end!

[banana.logic]

multiplier does work for any speed, and the engine life will depend on how many revolutions it does so it isn't definitely going to have 18% less life, but if you had two identical bikes except one has stock gearing and one has 14/53 and you rode them identically (same speed same gear) the modified one wouldn't last as long.

[Ninexz]

(01/11/2010 02:06)jbird Wrote:  [Sorry Nine, just re read my saved doc, pretty different. I read the part about MCAS auburn and city and it reminded me of when I bought mine I had to go to both stores because they were sold out]

No worries, lol.
You had me trying to remember if I referenced anything from someone else's thread. I was racking my brain over it.

[paparoach]

what do you mean by "wouldn't last as long?" referring to the engines outfitted with the sprocket mod.
what would "prematurely" wear out?

[Kritas]

I imagine the gears would get chewed up much faster, as a result of a higher load on the gearbox. I'm not sure about the rest of the engine, but I wouldn't be surprised if the load gets transferred from the gearbox to the top end too.

[Lane]

The increased wear would possibly be around 10% give or take which would be negligible next to regular oil changes, good quality oil, riding style etc.

Gears won't be "chewed up quicker", It's just like being in a lower gear on a pushbike.

[Aduro]

Your clutch would be under a tad more strain every time you take off. Also, its not that difficult to understand. With the sprocket mod the engine is revving higher doing the same speed as a stock bike. If one bike spends half its life revving 6krpm higher than another then its going to wear faster.

[Kritas]

(05/03/2011 22:47)Aduro Wrote:  Your clutch would be under a tad more strain every time you take off. Also, its not that difficult to understand. With the sprocket mod the engine is revving higher doing the same speed as a stock bike. If one bike spends half its life revving 6krpm higher than another then its going to wear faster.

Aduro, the 520 pitch front sprocket installed on the mod is slightly larger than the stock 428 front sprocket that is stock.(1-1.5cm larger)
Would that not mean that it's revving lower for the same output?

(07/07/2010 09:25)sir.b Wrote:  17 / 52 = 0.3269
14 / 53 = 0.2642

0.2642 / 0.3269 = 0.8082 (your speedo correction multiplier)

194 * 0.8082 = 156kph <- your speed when you hit the speed limiter
Justin.

Also, would that equation still stand? Considering the first calculation(17/52) is for a 428 pitch set up, and the second(14/53) for a 520. You can't compare the two as it's not the same unit of measurement.

I don't know 100%, I'm just speculating until someone can explain it further.

EDIT: not that it matters for me, as an mc19 reads the speed off the front wheel rotation anyway.

[Romantix]

can we get some pictures up of the larger rear sprockets?

[Romantix]

can we get some pictures up of the larger rear sprockets?