I appreciate the information!
I just found, on eBay, a pair of CB450SC carbs from a 1985 model - I
read through Paul's Nighthawk site, but I can't determine if there is
any difference in the carbs between model years. I would assume not -
but I also didn't like the price tag of the carbs I saw. Don't get me
wrong - I love my Nighthawk, but a previous owner let the cosmetics of
the bike go completely to heck (pitted chrome, pitted exhaust, couple
dents and dings here and there, missing decals, some surface rust etc)
and I know that if I were to restore the bike to show room quality,
I'd have a lot more invested in the bike than I want to. So anyway -
does someone have a set of good 450 carbs that they are willing to
part with?
-Joey
On Thu, Apr 29, 2010 at 11:02 AM, timhortons <[email protected]> wrote:
> I would be tempted to say adjustment rather than accelerator pump, but
> I'm a novice when it comes to carburetors, but the reason I would
> suspect tuning is because the carbs were sourced from another bike in
> which the mixture profile would likely be different than the 450NH.
>
> As far as I know, the accelerator pumps are more so for "acceleration"
> when you twist the throttle they spurt gas to offset a sudden
> leanness, other than that they shouldn't do much. The flat spot could
> be related to missing a accelerator pump or tuning, but the surging
> would be due to how the carbs are tuned.
>
> If the carbs were off a 400, even though it may not sound like a lot,
> those missing 50cc's would call for a different mixture than 450.
>
> I'd say, pull the plugs and look at the ends, that would be an
> indication of how it's been running and then that can help determine
> what needs to be done with the carbs.
>
> I didn't think an accelerator pump was "make or break", older bikes
> got by alright without them, I don't know if it was intricate to
> 450Nh's though.
>
> On Apr 26, 7:42 pm, Joey Kelley <[email protected]> wrote:
>> Hello All,
>> Wanted to introduce myself, my name is Joey and I ride a 1982
>> CB450SC with just over 13,000 original miles. (Just rolled over last
>> week!) Up here in Maine, where the riding season varies from three
>> months to six each year. This year we've gotten a good start already -
>> the end of April and I've been riding for two weeks.
>> When I bought my Nighthawk nine years ago - the carburetors
>> were deemed plugged up beyond repair. A replacement set of carbs was
>> salvaged from a 400 of unknown vintage and installed. She's had over
>> 9,000 miles on her since. Spent the past five years in my Dad's shed
>> and like all good Hondas, started right up with the old gas still in
>> it.
>> After nine years and 9000+ miles I'm getting annoyed by the
>> constant surging under partial throttle and flat spot between 3,000
>> and 4,000 RPM.
>> So here is the question, is this surging and flat spot caused by the
>> lack of the accelerator pump on the 400 carbs that I have installed,
>> or is it some problem or adjustment that can be made to the ones I've
>> got?
>> 50 Degrees and highway speeds makes for a cold ride home!
>> -Joey
>> --
>> -Joey Kelley
>>
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