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July 2nd, 2006, 11:12 AM   #1
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belmouth fitted and bored to 41mm carb

i took the carb into the engineer's and he has bored it to 41mm as he did with scoots. i had a blanking plate made for the end of the TPS shaft and most importantly i had a belmouth fitted.

most of you will have heard of this through dale. i had the alloy belmouth machined (as opposed to bored) out to take the blue plastic 50mm belmouth from keihin. this had to have the bolting lugs lathed off and then it was press fitted and araldited in.

the flare on the belmouth was reduced from some 72mm or so down to 68mm by just filing the outer rim slightly. this was done to allow the belmouth to fit in the air filter.

the air filter in question is a cone shaped pipercross filter PK003F. this filter fits into the triangulated area behind the sock-above the cross brace and between the two down tubes of the mid frame.

the standard outer Diameter of the belmouth for the sock is 62/64mm and the entry to the air filter is 70mm, so i had a white plastic ring machined up that was very broad and this was pressed onto the alloy belmouth.

i haven't made any extra holes in the plastic belmouth for the air feed to the PAJ and MAJ. because these belmouths are from a bank of four for jap multis: they have left a little straight 'nick' out of each side which is all the air feed that these two jets will need.

when first assesed i realised the air filter would push against the shock absorber so i filed away a production hole on the carb above the belmouth and what with the broad shoulder of the plastic i can now get the filter right against the carb and just about away from the shock.

i may even get a narrower jubilee clip and slice part of the filter's shoulder off and move it even further forward. the filter comes off the carb and off the belmouth easily now though.

the filter is foam and has a metal cage inside to give it shape. this i've ovalled very slightly but alas the filter toiuches the back of the boot mount in the frame and also sits on the cross strut in the frame.

the carb must be tightened on first and then the filter is tightened at an angle afterwards with the filter having to angle down slightly. so the top edge of the plastic ring on the belmouth can just be seen.

i've used the filter cleaning kit and oiler coded P/CC9005 and P/CC8999 and with the filter PK003F they can all be ordered in the UK from demon tweeks on 01978 663027, they're at wrexham in north wales. filter £34, cleaner and oiler were £20.

the blue belmouth i got from allins performance on 01949 836733, they are at bingham in notts. that was £13-all prices inclusive.

i've removed the original filter from the top of the housing and until i'm sure that this is working and WORTHWHILE i will leave it there touching the filter.

so far, when jet washing, i have rolled a plastic sheet up over and around the filter and it has been such a 'snug' fit that it was bone dry after a wash. there is less crap in the carb now than with the original set up!!! as the old set up required a shorter carb than the dell orto with a subsequent misfitting 'sock' and the grim that was within.

cleaning appears to be a pain because i need to wash without crushing the filter which isn't going to be easy.

PERFORMANCE
the carb is stronger at 1/4 throttle and switchback esses, this is the first time in second gear that the bike has lifted and the wheel not being where i wanted it. it's too early to say what the midrange and top are like but i do know that the 41mm bit of the equation only helped to top out in 6th gear.

so the bottom end performance boost is from the belmouth mod. next week i race with lots of open straights so we'll see!

the increase so far is 'small' but i'm not too sure where the bottleneck in the system is at present? i have some larger headers to try from 'simon' so it maybe they that help because they are the most needed.

regards

Taffy
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July 9th, 2006, 09:19 AM   #2
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Re: belmouth fitted and bored to 41mm carb

mildly suprised that nobody jumped in on this thread last weekend but there you are.

dry race today with some fast straights and tight stuff as well, so a pefect chance to try the new bike out. the belmouth makes a small difference at low revs and is most noticeable in second off a closed throttle. it'll do the same in first - it adds grunt!

i often found myself in a gear to high and the bike pulled this really hard. sometimes it felt like the bike did as well off torque is it would off BHP.

i have to do some jetting testing now just to be sure that i've noit missed something.

regards

Taffy
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July 9th, 2006, 03:32 PM   #3
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Re: belmouth fitted and bored to 41mm carb

Taff:

I suppose you fit something like these:



Is a Bellmouth the same thing as a velocity stack? I presume they are.
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July 9th, 2006, 03:41 PM   #4
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Re: belmouth fitted and bored to 41mm carb

And the filter something similar to this:
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July 9th, 2006, 10:11 PM   #5
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Re: belmouth fitted and bored to 41mm carb

yep!



Taffy
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July 9th, 2006, 11:12 PM   #6
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Re: belmouth fitted and bored to 41mm carb

Taffy, you tinker so much with your bike, I wonder if you have any time left to tinker with anything else...?

I guess this is not for regular trail riding, now, is it?
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July 10th, 2006, 11:16 AM   #7
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Re: belmouth fitted and bored to 41mm carb

i'm on a promise tonight nicky boy and there will only be one kind of tinkering!

i've told you where it will improve the power and by how much, i've told you how to do it and what it'll cost.

you may now make an informed decision....!

i reckon if you won't to pop the front wheel this is the mod.

as said, there could be more but i have to check the jetting. the track was so rough i couldn't tell bumps and judders apart for setting the carb.

if you want any help nick do ask. please do me the favour of telling me how to post photos now that i don't have a web site host.

you know the ones - straight onto this thread.

regards

Taffy
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July 11th, 2006, 02:06 PM   #8
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Re: belmouth fitted and bored to 41mm carb

i reckon if you won't to pop the front wheel 550CC is the mod.

Taffy good to see you still at it mate
cookeye
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July 15th, 2006, 02:20 AM   #9
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Re: belmouth fitted and bored to 41mm carb

taff

could you put some piccies of this in your gallery please mate. Very interested in this for my FS650

Keith
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July 15th, 2006, 03:20 AM   #10
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Re: belmouth fitted and bored to 41mm carb

i didn't get permission from my freind to go this far so i'll say no for now.

PM me if there's anything you don't get?

regards

Taffy
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