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Post by cramet on Dec 7, 2014 10:19:25 GMT
hi guys because iam such a heavy bugger i am wanting to change the front drive sprocket on my cb250n from 15t to a 17t to stop it reving so hard at 100kph i can find one with 530 pitch but not 520 are they compatible or am i going to have to but a new chain and sprocket set if any one is able to help it would be awesome
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Post by na44superdream on Dec 7, 2014 13:14:48 GMT
The 520s fronts are only available in (15&) 16T (which may be worth a try before going to 17T which is quite a big leap)
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Deleted
Deleted Member
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Post by Deleted on Dec 7, 2014 15:33:04 GMT
I don't think a 250 with a 17 on the front will cope with "a big heavy bugger" at all well! Are you sure you are going the right way?
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Post by scott on Dec 7, 2014 15:41:50 GMT
I have a bigger front sprocket on mine, thought it was 17 but could be 16. It has dropped the revs a little but can struggle a wee bit more with a head wind. I'm only 9 stone though, if I were a 'heavy bugger' I think sticking with std gearing would be what I would do. try going up from 15 to 16 and see how it goes if you really want...
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Post by cramet on Dec 7, 2014 20:22:44 GMT
Iam hoping iam going the right way at the moment i cant use 6th gear on the highway and thats no problem but i am in 5th with throttle wide open reving around 6 and a half to 7 doing 100kmh im more interested in fuel eco than power
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Post by scott on Dec 7, 2014 20:38:39 GMT
why can't you use 6th on the highway? if it wont pull 6th you don't want to go bnigger on the front as that is gearing it up even more, you'd want to go smaller on the front.
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ian
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Isle of Man
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Post by ian on Dec 7, 2014 20:45:53 GMT
Took the word right off my keyboard Scott  This was just how my 250 behaved at first, 'till I realised someone had raised the gearing.Going back to standard transformed the bike. If yours is already standard, maybe it's a weight issue, in which case try gearing it down slightly |
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Post by na44superdream on Dec 7, 2014 22:18:54 GMT
Iam hoping iam going the right way at the moment i cant use 6th gear on the highway and thats no problem but i am in 5th with throttle wide open reving around 6 and a half to 7 doing 100kmh im more interested in fuel eco than power You are sure you have a 41T sprocket on the back? (someone has not put a CB400N 36T on it have they). When my CB250NA arrive in the courier van it had 17T front and 36T rear 530 on it, hopelessly overgeared! First thing was to change it back to 15t/41t (520  )before I went anywhere. |
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Post by cramet on Dec 7, 2014 23:13:16 GMT
Il have to check the back one but the rest of the bike is bone stock so at this stage its only a guess but i need to do some thing 9ltrs of fuel for 140ks of riding is harsh
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Post by na44superdream on Dec 8, 2014 3:38:26 GMT
That is extraordinary, 9.67 miles per litre ~ 43 mpg ish, there must be something amiss.
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Post by paddlesat16 on Dec 11, 2014 21:13:35 GMT
I'd go standard gearing, Honda know what there doing and worked this out years ago.
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This was just how my 250 behaved at first, 'till I realised someone had raised the gearing.Going back to standard transformed the bike. If yours is already standard, maybe it's a weight issue, in which case try gearing it down slightly
)before I went anywhere.