Lack of performance - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 27 (permalink) Old 11-21-2011, 12:38 PM Thread Starter
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Lack of performance

Hi all,

I've not long bought a Honda SP1 after owning a Suzuki TL1000R for 9 years, but am a little disappointed with the performance. It's doesn't seem a patch on the TLR at all, either pick up wise or top end speed. I assume there must be something wrong, with all the positive wriite ups online. Does anyone know what to look out for? Basically I'm going to check the general things like plugs and timing but is are there any common problems which would cause the lack of performance?

Cheers
Dave
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post #2 of 27 (permalink) Old 11-21-2011, 01:37 PM
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What sort of performance differences are you seeing?

The RC51 and TLR were similar in performance engine-wise.
The main advantage of the RC51 was the better overall chassis design.
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post #3 of 27 (permalink) Old 11-21-2011, 03:40 PM Thread Starter
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Hello,

I have done a plug check and compression check. The rear pot is 175psi and the front has 130psi so there's quite a bit of difference between the two but the bike appears to run spot on. The timing's also spot on.

Basically the bike doesn't seem to be as powerful as my TLR all the way through the rev range and seems to really eat fuel.

Does anyone know what the compression should be on each cylinder? I assume the compression being down on the front cylinder will have an impact.

Cheers
Dave
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post #4 of 27 (permalink) Old 11-21-2011, 06:12 PM
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Fresh, the engine should have 176 PSI.
The rear is not too bad at -1 PSI from spec, but that front has some issues.
That's over 45 PSI down from the front.

Does it smoke from your exhaust?
If not, how's your valve clearances on the front?
If the valve clearance is way too tight, it may not be seating the valves properly.
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post #5 of 27 (permalink) Old 11-21-2011, 06:47 PM
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That compression is not good at all. Fix that and I'm sure you will be happy. The RC was never a real powerhouse, but if it is that noticeable compared to a TL, you've got issues.



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post #6 of 27 (permalink) Old 11-21-2011, 06:54 PM
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http://www.hordpower.com/index.php?m...roducts_id=380

Maybe talk with Hord, they can get you back on trck.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #7 of 27 (permalink) Old 11-22-2011, 04:00 AM Thread Starter
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Thanks to all who have replied. I will be checking the clearances this evening so fingers crossed it will be a shim issue where I don't need to strip the top end totally.

Cheers
Dave
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post #8 of 27 (permalink) Old 11-22-2011, 04:09 AM Thread Starter
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I forgot to say, there's no smoke at all. It's doesn't use any oil but the bike is a bit thirsty.

If it turns out to be the rings I will think about upgrading to high compression pistons at the same time. Do I need to upgrade the injectors at the same time?

Cheers
Dave
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post #9 of 27 (permalink) Old 11-22-2011, 12:35 PM Thread Starter
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Clearances are spot on. I'm just in the process of taking the head off to inspect the valves. Gutted
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post #10 of 27 (permalink) Old 11-22-2011, 03:43 PM Thread Starter
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Hi Steve,

I've stripped off the top end and found the front pot has a score all the way down. Time for the engine out me thinks.



I assume it's a full engine strip to get the pistons out.

Cheers
Dave
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