Honda BF20 outboard max rpm?

Deefor said:
This question I guess is general to all engines but I'm somewhat confused.

As you will see from Honda's spec http://www.honda.co.uk/marine/15-30hp/BF20/specifications/, they quote max rpm as 5-6k.

Is this quoted max rpm figure when the engine's under load or when revving the engine in neutral :confused:.

I only ask as my BF20 (now at 40 hours use) will only achieve 4k rpm max under load :o.
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Under load.
You probably need a finer pitch prop.
By preventing the engine reaching its max revs you are also preventing it developing full power. You'll see 20 hp is developed at 5500rpm
 
Thanks Vic ;).

As my boat is only a month old, I'll be calling the Honda dealer who supplied the engine and also the boat builder tomorrow.
 
+1 agree with VicS. You need a prop with 2 inches less pitch. Normally the dealers should have got this right when supplying the boat or engine
 
Check if your engine running height and angle on transom is ok
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If possible remove weight and re-test it. Weight is the sole most efficient way to get (or loose) speed.

If you do not reach at least 5k your engine is lugging and that is bad - worse than high rpm.

When stated as 5-6k you aim for 6k as this gives better hole shot, a reserve for extra load and allows the engine to run a bit lighter.

As a rule of thumb one inch less in picth raises the rpm at wot by 200. This indicates a 5 (!) inch reduction in your case.. which again sounds a lot so testing is way to go.
 
I've an update on this "fiasco" but I'll wait to post the outcome when the manufacturer (Viking Mouldings) has spoken to the supplying Honda dealer on Tuesday 12th June :mad:.

I did speak to Honda Marine UK who took great delight in telling me they don't have any technical support in the UK and that I'd have to speak to one of their dealers. Double :mad::mad:.

How we're going to gain c.1500 rpm remains to be seen but I can't see us achieving this no matter how much the pitch is changed :confused:. BTW, OEM prop is a four blade 9 1/4 x 10.
 
changing to a 3blade would be the first place to start...
but your going to end up with somthing that is going to be reving its nut's off and going no where fast.
 
Hi Deefor, did you post any pics of the Viking build after the single one on 28th? I did regular searches but could not find any posting after that one. Cheers JRR.
 
JRR said:
Hi Deefor, did you post any pics of the Viking build after the single one on 28th? I did regular searches but could not find any posting after that one. Cheers JRR.
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Dare I say, no not yet :o.

We have a few more pics of the visit prior to collection and one or two of the first launch. I keep saying to myself that I really need to spend an hour or two finishing off the thread but again, it's just finding the time.

There's been a few minor issues since the handover but I'll cover these in due course. Aftersales service, hmmmmm :rolleyes:.
 
Thanks for the reply Deefor. :) As I am new to the forum and dare I use the excuse, being of a certain vintage, computers can be somewhat of a black art to me :confused:. Things have a habit of disappearing into the ether:eek: and I am not always sure if I have sent them or indeed accessed the right part of the forum.

I can fully empathise with your being busy, especially reading the teething problems you are experiencing with the Honda presently. Hope you eventually get satisfaction from all parties, who, should take responsibility for their product having benefited from your hard earned cash.::(

I shall await with patient anticipation for your pictures/reports on the finished product and launch. Good luck and best wishes. JRR:)
 
Hi

Honda are 100% dealer focused for everything they sell so everyone they have in the uk is aimed at helping us and training us unlike some others who support you from Switzerland ahhhh.

so if you go to your local dealer they can sort this out as we all get paid for warranty work ( not that there is much of it:() as well as the dealer you got it from.

problem solved.

Dave
 
clydeoutboardservices said:
Hi

Honda are 100% dealer focused for everything they sell so everyone they have in the uk is aimed at helping us and training us unlike some others who support you from Switzerland ahhhh.

so if you go to your local dealer they can sort this out as we all get paid for warranty work ( not that there is much of it:() as well as the dealer you got it from.

problem solved.

Dave
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I've asked the Honda dealer who supplied the outboard to the boat manufacturer about giving me FOC a high/power thrust Honda prop to try. They don't carry them as stock items but could get me one for around £90.

In your un-biased position as a Honda dealer, do you think my dealer is being fair or should they be trying harder to help? :confused:
 
Hi

I can only say what we do and we sell Honda's uk wide and yes we would not only supply but if at all possible fit it.

Every boat is different and some people travel light where as others take the kitchen sink so every dealer should know what the boat is, what weight it will be fully laden and ask what engine/ prop was on it before they even give you a coffee let alone sell you an engine.

My biggest point though is this..... You say the engine is not reving right which means something is wrong and hence they should fix it for you. The engine is under warranty so they get paid for fixing it and if they made a mistake then they should also fix it.


Dave
 
Thanks Dave for that very useful info. I'm not going to let this one go :mad:.

As luck would have it, the engine (plus boat) is being trailed to a Honda dealer (Redline Outboard Services) in Abingdon, Oxon, on Saturday 23rd June for it's first 20 hour service. I haven't yet discussed the prop/rpm issue with anyone else but the supplying dealer so I'll see what Redline's take is on the matter.

Once agian, many thanks and will post back here with hopefully good news.
 
Deefor said:
As luck would have it, the engine (plus boat) is being trailed to a Honda dealer (Redline Outboard Services) in Abingdon, Oxon, on Saturday 23rd June for it's first 20 hour service. I haven't yet discussed the prop/rpm issue with anyone else but the supplying dealer so I'll see what Redline's take is on the matter.
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Dave - just back from the first service and Redline agreed that a high/power thrust prop would be the way to go given what we're expecting of the boat. However, when I asked if this would be warranty work, they skirted round the issue. Reading between the lines, yes they'll get me a prop but it's gonna cost :mad:.

How do I deal with this now as two Honda dealers have told me it's going to cost to replace and who should I now turn to now to try and sort this issue out FOC? :confused:
 
This is silly the engine is not fit for purpose as it is not reving. They need to either take it back and refund you or fix the problem.

The 2nd dealer I can understand as it sounds like the first dealer made a mistake and that there is nothing wrong with the engine so why should he lose out to fix it might have been his first thought, but as he would have won your servicing and a new v happy customer it would make financial sense to do it. You also might want to call him and tell them this if they sort you out.

re the dealer who sold it,............. do what most people do. go in on a Saturday when he has customers in and complain loudly and explain how you feel and that they will not be getting your servicing work and that you will not let this drop.

sorry I know the above sounds pathetic but its not worth taking the idiot to the small claims court for the price of a prop even though you are 100% in the right and should be very angry with they way you have been treated.
 
Again, many thanks Dave for your input. The supplying Honda dealer (to the boat builder) is some 100 or so miles away from me on the South coast and I'm on the Thames. He wouldn't be getting my service work anyway.

Come Monday, I'll be turning my attention to the boat builder as, in essence, if I bought say a Fairline or Princess with Volvo engines, the boat builders wouldn't be asking me to sort the issues out with Volvo dierct, they'd do it on my behalf. I've already sent them an e-mail this evening and will follow it up with a phone call on Monday.

I hear what you're saying - my builder has sold me a boat with an engine package that should be capable of achieving, within reason, what Honda claim :mad:.
 
Had an impromtu visit from the builder (Viking) a few days back. We discussed the prop issue, a few £'s changed hands and with the promise that I'd get the new prop by Saturday 30th June latest.

Today, I collected the Honda power thrust prop that Viking had arranged from D&R of Walton on Thames. They would have posted it but I needed it for Saturday.

The original Honda dealer who supplied Viking with the BF20 wouldn't even supply Viking with a new prop at a decent price. So, to S.A.L. Marine of Lymington, no more business from me :p.

Suufice to say that I'm now more than happy with how Viking (eventually) handled this and to Ian Richards of D&R for arranging it so promptly. Will see how the OB performs over this coming weekend and will report back.

Thanks to all of you for your input, as always it's greatly appreciated :).
 
Deefor said:
Had an impromtu visit from the builder (Viking) a few days back. We discussed the prop issue, a few £'s changed hands and with the promise that I'd get the new prop by Saturday 30th June latest.

Today, I collected the Honda power thrust prop that Viking had arranged from D&R of Walton on Thames. They would have posted it but I needed it for Saturday.

The original Honda dealer who supplied Viking with the BF20 wouldn't even supply Viking with a new prop at a decent price. So, to S.A.L. Marine of Lymington, no more business from me :p.

Suufice to say that I'm now more than happy with how Viking (eventually) handled this and to Ian Richards of D&R for arranging it so promptly. Will see how the OB performs over this coming weekend and will report back.

Thanks to all of you for your input, as always it's greatly appreciated :).
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So that is 10 x 7⅝ inches in place of 9¼ x 10 inches

That should get the revs over 5,000 with no problems. The increased rpm will allow the engine to develop more power so it should get the boat on the plane more quickly and push it a bit faster too.

Going to use more fuel though :(
 
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