OzVMX Forum
Marque Remarks => Yamaha => Topic started by: YZ250H on April 02, 2015, 09:05:36 am
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Hey Guys,
I'm doing some research on HPI ignitions and I want to compare the advance curve they provide with the standard Yamaha Curve.
Is anyone able to help ? If the HPI ones are any good you can get the entire ignition for the same price as getting a coil rewound :o :o
Thanks in advance for any assistance given.
Cheers
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Thanks in advance for any assistance given.
Cheers
The aftermarket item has more of a J shaped curve than the standard u shape. You can also get them in chrome.
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And be wary of the SPIKE when GROUNDING ;D
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Hey Guys,
I'm doing some research on HPI ignitions and I want to compare the advance curve they provide with the standard Yamaha Curve.
Is anyone able to help ? If the HPI ones are any good you can get the entire ignition for the same price as getting a coil rewound :o :o
Thanks in advance for any assistance given.
Cheers
Unless you know what your doing or have access to a dyno a programmable ignition will be hard to get the most out of. In saying that I have yet to put a programmable ignition on and not find great gains straight away. Ignition curves don't vary much, it is more about being able to tailor it to your engine
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Thanks Guys (well thanks Lozza).
I wasn't going to get the programmable version. For 7 seven euro's I was thinking of getting the selectable curve option (only one other curve). Just for shits and giggles.
I might give it a go and see what happens. It replaces the entire ignition so ......
I'm not that big on keeping it all standard. I just want the bloody thing to go. >:(
Hopefully the HPI option won't be a disaster.
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Here is the conundrum without knowing the advance curve prior to purchase it is hard to know if it is going to suit the bike. That's why I say put that money to a programmable.
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Tony, Do you wanna dick around with shit in the faint hope you may save some money or do you want it to work properly.....guaranteed. If the latter send your stator, rotor, cdi, coil, spark plug cap and kill switch to Steve Warnes at Better Bikes.
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Do I have to bring my own ignition if I want to ride it at Classic Dirt ??
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Do I have to bring my own ignition if I want to ride it at Classic Dirt ??
Are you back again this year Hilly? Bring a CR brake rebuild kit while you're at it. And extra food for Phil.
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hope too get there .
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Tony, Do you wanna dick around with shit in the faint hope you may save some money or do you want it to work properly.....guaranteed. If the latter send your stator, rotor, cdi, coil, spark plug cap and kill switch to Steve Warnes at Better Bikes.
Where the motto is "underservicing and overcharging since......"
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Geez, you guys are harsh ::) ::) ::)
Lozza, the HRI kit shows the curves of their kit. I'm looking for the curve from Yamaha so I can compare them.
Am I making sense or do I need to just burn the bike and go fishing :o :o
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I've not had a timing light on a 250H but my guess would be it's not much of a curve, probebly just a bit retarded down low for starting and fairly flat from the mid up. Seen a couple of those HRI ignitions fitted recently and they work ok just had to run them a little more advanced than they recommended.
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OK. Here's the HPI curve for the ignition for the model they suggest.
(http://i202.photobucket.com/albums/aa49/tbarsby/068_curve_1c_068_full_zpsgu86kgqd.png)
Just looking to compare with the original. I found one for a 465 but obviously quite different.
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Do you have to choose a curve before you buy it?
Remember you will only be running at race speed between 4000 to 8000 rpm were there is not much changing and if you get it timed for best power at around 8000 the rest will be close.
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Thanks Sleepy. The red curve is the standard and for an extra 7 Euros you can get the second (blue) curve put on. Then it's selectable.
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Blue looks like it would give about 4 or 5 deg more arround 8000 but if you set the static 4 or 5 more on the red there would be bugger all difference. Still with the 2 curves it may be a bit easier to get the timing correct by the seat of the pants. Does it swtich between curves with a handle bar switch?
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It can do, yes.
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Don't stuff around just buy one. Did you try Dave Turner for the rewind?
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if you get it timed for best power at around 8000 the rest will be close.
Tony actually spends most of his time WFO, so i'd be thinking he needs something that works best at around 11,000 rpm ;D
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Yep, as long as it makes power between 10 000 and 11 000 I'll be right 8) 8)
Other than that all I need is a smooth idle ::)
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OK. Here's the HPI curve for the ignition for the model they suggest.
(http://i202.photobucket.com/albums/aa49/tbarsby/068_curve_1c_068_full_zpsgu86kgqd.png)
Just looking to compare with the original. I found one for a 465 but obviously quite different.
Get them to supply a few extra pistons for the holes you will put in them with that curve. Especialy on that curve 2. Looks like a amature guess/stab in the dark. Will run good down low then come to an abrupt brickwall around 7000 then hole a piston if you keep reving it
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Thanks Lozza. You may have just saved me a lot of money :o :o
Back to the drawing board :-\
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OK. Here's the HPI curve for the ignition for the model they suggest.
(http://i202.photobucket.com/albums/aa49/tbarsby/068_curve_1c_068_full_zpsgu86kgqd.png)
Just looking to compare with the original. I found one for a 465 but obviously quite different.
Get them to supply a few extra pistons for the holes you will put in them with that curve. Especialy on that curve 2. Looks like a amature guess/stab in the dark. Will run good down low then come to an abrupt brickwall around 7000 then hole a piston if you keep reving it
Gee ever helpfull again.
I realy get a good laugh form your posts. Makes you wonder how 2 strokes ever ran with a pionts system without curves.
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Betta Bikes 08 8384 3550 Steve Warnes
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Just doing some research Teddles :-*
I've been down this road before and at the end of the day you've still got 34 year old components that can crap themselves with no real notice >:( >:(.
Just looking to see what's available, pros / cons etc. I don't have as much cash as I once did so .....
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That is why I'm saying Betta Bikes. Throwing good money on ( supposed ) cheap fixes never works. Get him to install modern electronics inside your old ratty original elec housings, seal up and look at it in another 34 years. Just like others are doing with forks, shocks and motors. Your bike. Your call. Good luck mate.
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Thanks Teddles. You didn't tell me they put new internals in the CDI ::)
To be honest this bike has always annoyed the shit out of me for one reason or another. If it wasn't such a shit market I would sell it.
How's that new ute going ???
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Ute is great.
You have easily the best model in that class. If you had it looked at from top to bottom by a qualified mechanic, John Tate, Teknik or Ross McWatters, all of whom know how to build the best race bike out there, bar none, and opened your cheque book you would realise how good your bike could be.
This is what i do, much to the amusement of some on here. I go to work and pay professionals to do what they specialise in. While i earn more than they do it makes sense to do it that way and it is done right.
Talk to Steve. That part is free. ;D
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Free is good for me ;)
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I have run one of these hpi ignitions on my yz250g for about 3years ciscos originaly did mine I think they did the timing curves as well
it did pick up a couple horsepower over stock ignition on dyno but in real world conditions the bigger horsepower curve isn't that easy to ride on tight motorcross track so I run the other curve that's in my box I don't know if they used the curves posted they told me they did there own I am going to buy the program to play around with timing curve because I think there is more to play with to smooth out power delivery but overall the actual unit has been reliable
peter
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OK. Here's the HPI curve for the ignition for the model they suggest.
(http://i202.photobucket.com/albums/aa49/tbarsby/068_curve_1c_068_full_zpsgu86kgqd.png)
Just looking to compare with the original. I found one for a 465 but obviously quite different.
Get them to supply a few extra pistons for the holes you will put in them with that curve. Especialy on that curve 2. Looks like a amature guess/stab in the dark. Will run good down low then come to an abrupt brickwall around 7000 then hole a piston if you keep reving it
Gee ever helpfull again.
I realy get a good laugh form your posts. Makes you wonder how 2 strokes ever ran with a pionts system without curves.
sigh rolleyes facepalm
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Thanks for the feedback Peter.
I'll keep researching and put what I find up on here.
Cheers