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[sofiaspin]

Has anyone fitted the standard performance kit to a Euro 4 C5 EFI? I am considering it as my bike is sluggish and with poor top end - the old Electra X was considerably faster! Any comments gratefully received.

PART No. 90601A

PERFORMANCE KIT, 500 EFI's (2017 onwards

Price: £845.00 (Excl. VAT)

Price: £1,014.00 (Incl. VAT)

[ric]

Have you tried running a higher idle speed to improve WOT fuelling ?

[Haggis]

How does increased idle speed affect high revs?
Idle is altered by adjusting the the air bypass screw.
This has no other effect other than at idle.?

[ric]

It would be quicker for you to adjust the screw, ride your bike and agree with me than for me to explain everything but will gladly do so and advise what can be done as a no cost reversible mod to improve top end performance on a stock bike by simply adding more fuel ONLY at WOT which will probably take me over an hour to type.

[ric]

Okay, firstly my apologies for the above, i was in the process of checking out of my hotel room and on-line at the same time and my reply does seem a little terse. I’m now relaxing out in the beer garden so will hopefully be able to answer your question...

[hagis]

Certainly my standard euro 4 bullet does 20 mph in first gear (hits rev limiter)- 40 mph in second gear hits r/l- 55 in third gear (hits r/l)- 65 mph in forth- and up to eighty in top gear-never have hit the r/l in 4th 5th, It has 18 inch rear wheel and 17 tooth gearbox sprocket, its coming up to a service so I will fit 18 tooth gearbox sprocket at this service for better cruising, these readings are speedo readings, I have not had the chance to compare my speedo readings with other bikes so these will be a bit optimistic, may be worth checking your gearbox sprocket drive size as a bigger sprocket is a cheap performance fix.

[sofiaspin]

The idle speed is set quite high, and increases after a run. The bike is displaying stuttering and surging at LOW throttle speeds, ie on moving off - not at idle. So I am not bothered about idle settings at this stage, that can be tackled if a power commander goes on.
I am however, concerned about the R/L, as spotted by Hagis, which is unpleasant when overtaking, a new one on me, and resolving that and gaining more top end is a key motive leading me to ask the initial question. Fitting an 18th sprocket is a sound suggestion and one I will probably pursue. I am interested to know views on whether the kit is worthwhile, particularly the engine bits. I already have hosts full flow exhaust system and the K&N, plus AI elimination kit, so the probable move is for a Power Commander. The exhaust system and filter are producing lean running at lower speeds, but excessively rich at high throttle speeds. It was put on a dyno, hence we know how it is fuelling. Appreciate it is a bit trial and error on the Euro 4 as hosts are still on the development side with the model.

[ric]

Sounds like there are other problems/factors here that are not going to be addressed by simple bleed screw and other adjustments. The tighter restrictions and targets that Euro IV present are not helping anyone. Euro V when it comes along in a few years will be worse and add a lot more expense into the mix.

[sofiaspin]

Too true - my 2014 Woodsman Efi was a doddle compared to the Euro 4 -

[hagis]

I have given you my performance figures as a yardstick to bullet performance, and it does look like you have other problems, My thoughts would be to put the bike back to standard, that is removing aftermarket parts and putting original parts back on and see if this makes bike run correctly, then checking its performance against my figures, if it runs ok and you get performance close to mine then you will know where the problem is, and spending money on aftermarket parts does not always work out.