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Post by looey on Mar 23, 2010 19:53:04 GMT 1
Firstly, did all models (12A or 10W) all have barrels marked 10w ?. I have 3 bikes here, 1 x 10W and 2 x 12A and they all have 10W barrels and 10V heads ??. Also, one of the 12A's I'm rebuilding the top end after the top of the piston started to melt after a long period of flat out abuse. It has a pipe and K&K filter fitted but still the std 185 main jet and std grade plug. When I've rebuilt I will go one up on the plug but can anyone tell me a good main jet size to run with the K&N and aftermarken pipe. Moochas  |
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Post by rich3648 on Mar 23, 2010 21:53:22 GMT 1
that confussed me as i have a standard 125 with allspeed exhaust with standard airbox and it runs perfect on a 185 jet ,anymore and she splutters.then i also have a standard mk2 with a micron power and she runs perfect on a 210 jet with airbox.so in my history of rd's 125,standard jet on allspeed,2 to 3 up on micron power and the same on micron or swarsbrick.no power air filters involved.then again i have a mk 2 with a nikon pipe with standard bore and airbox and she power wheelies in first and second,i think each engine is a individual and will always confuse us but that makes it more fun for us ...........
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Post by looey on Mar 23, 2010 22:38:54 GMT 1
Cheers for the answer Gaz, I won't get them mixed up, don't worry The bike I'm repairing deffo has a 12A carb, so I'll stick a 240 in it to be safe. My own bike deffo is deffo all 10W and is running std airbox and filter at the moment with an Allspeed std 155 main jet and the plug is a nice colour on the std jet. I was reading that AR125 Vs RD125LC article where they tried some mods on the RD and they found on a 10W carb with K&N and 180 jet it gave an extra 2.5BHP which is quite a bit extra given they are already unrestricted ?. You think the 180 will be too much ?, I'll be running a Ram Air foam pod with an Allspeed. |
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Post by looey on Mar 23, 2010 23:12:05 GMT 1
You're not wrong about the Allspeed, it pulls like a train until about 9k then just stops like someone switched the ignition off  . Should be kind to the crank if nothing else ;D ;D It came with the Allspeed already fitted but I've got a later type Micron to try on it (detachable can type), so I'll see what it does with that on ?. Gotta get some jets first, I'll be giving Norbo a shout in the morning  . |
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Post by looey on Mar 24, 2010 8:13:04 GMT 1
MMMM, I'm not sure which one I have ?. Upto the end can it looks like any small can Micron but it has an alloy bolt-on end can (3 allen bolts) with a removeable baffle that's held in with the std internal type circlip and the outer end of the baffle has a tube spout with a slight bend on it. It's Marked MICRON BS AU 193 -T2 PC UN-1  Back onto the subject of air filters. Back in the day (you know when we all had bread & jam for tea  ), I bought my first 4L0 350LC from a tuner (it ws his own bike), it was tuned to an inch of its life and that ran a standard airbox, std air filter element but had the entire lid removed and a run of insualtion tape all around the outer edge to hold the element in. Has anyone tried this on a 125LC ?, I guess the question is, does the small lid opening at the rear actually restrict the air flow required when running a pipe and bigger jetting . And what about gearing ?, I assume the best gearing is to stick with the std UK 12A gearing 16/45 ?. |
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Post by looey on Mar 24, 2010 9:50:48 GMT 1
Well I got it on, and you're right, it does need a shorter can but it should go better now. It did fly before but was like hitting a brick wall at 9k  Can you buy shorter decent cans off the shelf that fit with the correct hole centres ?. I've also removed the airbox lid and it's got a Pipercross filter element in there (black top, red bottom), so I'll see what it's like. Has made a slight increase in induction noise but nothing too intrusive, the pipe is deffo louder ;D . Brackets holding the cage over the top are just some I found for now to clamp it down but it's all out of sight anyway    |
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Post by carlos on Mar 24, 2010 18:39:23 GMT 1
Yamaha spent loads of money designing the air box, and unless your bike is really highly tuned, I reckon you should bow to thier knowledge, they're not that restrictive anyway!
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Post by looey on Mar 24, 2010 19:25:06 GMT 1
Yes that's true to a certain point but their designs also have an element of noise reduction consideration too, which is the one and only reason they have the intake nosel in the corner of the airbox. And if that is solely the case then shouldn't we all be putting our std pipes back on cos Mr Yamaha's exhaust must produce more power ?.. Yamaha spent loads of money designing the air box, and unless your bike is really highly tuned, I reckon you should bow to thier knowledge, they're not that restrictive anyway! |
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Post by looey on Mar 24, 2010 22:05:50 GMT 1
that small can on my nikon??? ebay...£20... ;D type in end cans on search ...then feast ya eyes!!!! Help me, I've been looking and I don't see em  |
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Post by carlos on Mar 25, 2010 8:01:52 GMT 1
Yes that's true to a certain point but their designs also have an element of noise reduction consideration too, which is the one and only reason they have the intake nosel in the corner of the airbox. And if that is solely the case then shouldn't we all be putting our std pipes back on cos Mr Yamaha's exhaust must produce more power ?.. Yamaha spent loads of money designing the air box, and unless your bike is really highly tuned, I reckon you should bow to thier knowledge, they're not that restrictive anyway! The exhaust have to reduce noise, etc, that's why they're more restrictive! |
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Post by looey on Mar 25, 2010 10:15:50 GMT 1
Granted, the exhaust is more restictive cos it has a bigger job to do curbing noise but that is also the case to a lesser degree with induction noise and the airbox. It's well documented that ditching the airbox, fitting a K&N filter and upjetting the already unrestricted 10W version adds 2.5bhp to the peak power, which is big gain in percentage terms at over 10%. Mr Yamaha ?. Anyway..... you keep your lid on and I'll leave mine off |
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Post by carlos on Mar 25, 2010 19:36:18 GMT 1
I'm 17 stone, I'll just go on a diet!
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Post by looey on Mar 25, 2010 21:09:06 GMT 1
;D ;D ;D You could be right  |
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Post by stev04 on May 3, 2010 0:12:27 GMT 1
Hi all i have a mk3 rd125lc ypvs and am struggling a bit with the main jet size i have a 195 in which is how it was when i got it and it splutters at 7k in every gear
anyone help
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. Should be kind to the crank if nothing else ;D ;D
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), I bought my first 4L0 350LC from a tuner (it ws his own bike), it was tuned to an inch of its life and that ran a standard airbox, std air filter element but had the entire lid removed and a run of insualtion tape all around the outer edge to hold the element in.
