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Discussion in 'The Pub' started by my67xr, Jun 13, 2017.
+1 for the spare tank idea
Well I have to say that JAP Bike Spares are on the ball with deliveries and their packaging is great too..
My 466 Big Bore kit arrived today and apart from the pistons being tiny.. they look to be extremely well cast and finished.. no sharp edges other than the ring lands and even then they are not Sharp.. just well finished.
These things are 54.5mm in diameter.. how small must the FZR250 pistons be as they would almost be half the displacement.. not knowing the stroke differences of course.
Popped back into its plastic safety and put on the shelf in the Bike garage until I have either finished the SRX or I get fed up with it for a while and start on the CB400...hmm no lets say definitely finish the SRX.
paddock stand bobbins also for the flyer (no sidestand)
Good move going COP.
Good work on the pencil coil's,
they look a touch longer than mine ?
I don't know if you want to edit post number 3 here and add the coil number to the list with spec's, ohm's reading's, and length etc
Done .... Denso 129700-4840
Yea they will go on the flyer .... 142mm in length ... plenty of clearance on the FZR
I think I used either Denso 129700-5430 or Denso 129700-4400 for the two ZXRs I've done. They had similar primary and secondary windings specs and they were the shortest available (127mm). What's the spec for the Denso 129700-4840? We should have a master sheet in the resources section @GreyImport .
Craig has a list posted in that link above ... but a pdf in the resources would be a good move and easier to find
I was looking for accurate specs on the Denso site but couldnt find them ... not that I tried too hard , but this is what Adrian posted for them ...
129700-4840 1.6 - 1.7 Ohm's primary and around 13K Ohm's secondary
Honda CBR1000RR 2004-2007
The Denso site won't have any specs. Denso make coils to order, so the manufacturer will give them a spec and they build to that. e.g. length, primary, secondary etc. I know, because I rang them and spoke to one of the senior folks about some coils I was chasing (129700-4150) to see what the specs where. I can't recall if he said that some pencil coils won't work with a TCI or whether someone on here said it. Can someone confirm that statement please?
Might be me. Ignitech told me not to use certain stick coils with the FZR but I think that was to do with wrong resistance values.
Thanks Blair. If @my67xr confirms that one way or the other I can buy some I'm looking at.
You have to match the resistance against the manual, remembering that you will have two stick coils run in series, so add the values and then compare to the original spec. If the originals are twin output coils.
This is for a different project. I was so impressed with the performance of the stick coil conversion on the ZXR that I'm now trying to do it to a VT250F. It has 2 TCI boxes; one for each cylinder, so the manual says Primary resistance is 2.4 to 2.9 ohms and Secondary resistance is 13 to 16K Ohms. As long as the secondary is the same..ish and I can use resistors to get the primary in the correct range it should work...right?
Yeah can't see any problems doing it that way,
just don't go any lower than 2.4Ω on the primary's otherwise it'll overheat the transistor's in the TCI's
Actually, they should be in parallel, not series. Series is through one and then the other: 6V through each, the resistance is added together. Parallel is were the wires split 2-4 so they both have their own circuit: the total resistance is halved instead of doubled, but 12V runs through each coil. Like with @Frankster putting resistors in, halving the voltage in means halving the voltage out. Hope that helps.
Yeah you're right. I have to go check how I did mine now, 6V to each coil is not ideal.
In a waste spark configuration, don't you add the resistance of each primary coil winding together to get a total resistance value? e.g. if the manual says 1.8-2.4 ohm resistance you need 2 coils of .9 to 1.2 ohm resistance? the 12V remains constant as it's just completing the circuit from + to -
The coils I used on the ZXR were 1.3 ohm primary resistance each, so I'm putting 2.6 ohm resistance into the circuit...right?
I think when the right configuration is sorted out we need a decent diagram/schematic showing how to convert twin lead coils to COPs showing the correct wiring and resistance etc etc etc
And then also when I go to do it I can follow it
I think you did something like that in your bike thread @my67xr ?
This image has died from the COPs thread in Tech Tips .....
This is the picture that's missing
And this is another diagram showing how they're wired up
Your diagram is what is called SERIES. This means the voltage (think of it as pressure, say from your water tap), drops as it goes through the resistors (small openings, like a tap turned on only a little bit - current if volume flow). So if you have 2 small orifices in a pipeline, the pressure drops at each orifice. Likewise, the voltage drops across each resistor. So 6V per coil. On a capacitor discharge (waste spark?) system, the capacitor has a certain charge size (volume) to send, which starts at a high voltage. So if they are in series, then half resistance is required, but in parallel, double the resistance in each coil. I've done a bit with electricity, it is AC with capacitors and induction that brings out the black magic...