Dyno Disappointment.....

[Neosophist]

Should have brought the ones I posted up They were advertised as kehin.

If there made accuratly to Kehin spec they should flow the same!

[phil x]

Right!

I have just had a second run out on the bike (nice day ) to confirm my thoughts from the previous cold dark evening.....

The bike, fitted with 4x115 'Keyster' main jets is running fantastic, the midrange dip is barely there, indeed, it's hardly a dip, just a progression of performance from low reve - I still have throttle response & decent acceleration through it whereas before is felt 'sluggish & boggy', there is now a noticeable change in engine note at 6 1/2k (as 4 valve bike engines tend to) & the engine pulls crisp & cleanly right through - it now has a crisp bark as she accelerates.
I whipped a plug out & it was mid tan (was black with 115/118 RO mains)

It now feels right, sure I will get it redynoed sometime but may do a full service 1st (valves etc).

BUT along with changing jets, I also rechecked the needles (all ok) & noticed the needle retainers could be fitted 2 ways - I set them all the same (were mixed up - my doing). Not sure if this would make any difference to how the bike pulls.
Heres the thread....;

viewtopic.php?f=24&t=30933

Anyway, I'm now a happy bunny

Phil

[philfingers]

so briefly Phil, what spec is your bike with the 115 Keysters in. Have you lifted the needle 0.5mm, is it otherwise stock, inc filter, silencer etc?

[phil x]

Completely stock, exhaust, needles, filter, airbox all standard & unmodified.

Phil

Sent from my HTC Desire S using Tapatalk

[VFR400+]

Do you have a link to the jet you ended uo buying. Gonna get some ordered up myself.

[phil x]

Here;
http://www.ebay.co.uk/itm/BRASS-MAIN-JE ... 391wt_1568

I ordered 4 x 115s
From the initial runs out, these seem fine but if I was buying again, personally, I get some genuine Keihin ones (I thought these were going to be but misread the listing).

Phil

[VFR400+]

Cheers for the link. You running front and back with the same jets then?

[phil x]

Yep, thought as it was built with 4 matching jets I'd stick with it. If it was a later bike I would have used different jets f/r.

....but then I wouldn't have needed to 'cos it would already have them in lol

Phil

Sent from my HTC Desire S using Tapatalk

[phil x]

UPDATE!

It is a while since I started this thread, so I thought I'd give an update on progress.
I fitted (aftermarket) mains - all 115s to replace the RO supplied 115/118s which I felt made the bike run too rich. The bike was originally fitted with original 110s all round & ran too lean.
When fitting the 115 jets I also placed all of the needle retainers allowing the hole in the base of the slide to show - it seems no one has picked up on the fact they can be reinstalled in 2 positions. I believe they do make a difference to the troublesome 6-7k flatspot area.....

The bike instantly felt better it felt right, the flat spot at 6-7k had all but gone & the engine pulled stronger above 10k.

She's now had a full winter service; all bearings stripped greased, all fluids changed, new plugs & (genuine) filters & valves done. Apart from the mains & pilots set to 2.25 turns (too lean with 2 turns) everything is stock settings, original exhaust & genuine Honda air filter

Here's the latest dyno run - it doesn't look that much different from the 1st runs but does show a slight improvement throught most of the rev range & doesn't compare to the difference on the road & in real world conditions.

Sure the bike is running quite a bit leaner to the previous run & feels better for it. Much sharper & crisper



Phil

Ps; the bike won't be going back to Quill (Golborne) - as when the Dyno guy was wheeling it out of the workshop he crunched one of the mirrors on a door frame slightly bending the screen brace & cracking a chunk out of the screen - he didn't seem overly apologetic & said I'd be able to get one from ebay......
Clumsy fecker
A free dyno run was the only consolation. Great

Phil

[alexwitham]

Reference to the damage to your bike - speak to the boss. Their business liability cover should insure the damages. Not fair you having to pay for their negligence.