Evilchicken0 Posted May 20, 2020 Report Share Posted May 20, 2020 My project bike is a tuned ThunderCat (4TV) engine, TCat carbs Foxeye (4JH) loom and CDI. It will idle but if I (or the garage) try to give it any throttle it spits (through the pipe) and "wont have none of it". The TCat carbs have a TPS but the 4jh ones don't ... Tell me of TPS why it might be needed or not - are TPS carbs that different to the non TPS ones ... etc Quote Link to comment Share on other sites More sharing options...
TLRS Posted May 20, 2020 Report Share Posted May 20, 2020 Ignition? Probably no provision for mounting the tps on non tps carbs but you're the one with the parts! Quote Link to comment Share on other sites More sharing options...
Evilchicken0 Posted May 21, 2020 Author Report Share Posted May 21, 2020 I have a set of TCat carbs on there at the moment but also have a set of 4JH ones without tps Quote Link to comment Share on other sites More sharing options...
srad34 Posted May 21, 2020 Report Share Posted May 21, 2020 (edited) I went everything Tcat on mine to avoid as many compatibility issues as poss... I just want a simple life! Edited May 21, 2020 by srad34 1 Quote Link to comment Share on other sites More sharing options...
Swarf Posted May 21, 2020 Report Share Posted May 21, 2020 Surely tps will only work with the cdi if said cdi uses tps in the first place? 3 Quote Link to comment Share on other sites More sharing options...
Swarf Posted May 21, 2020 Report Share Posted May 21, 2020 Quick google suggests you need the chundercat loom and cdi. Quote Link to comment Share on other sites More sharing options...
Evilchicken0 Posted May 21, 2020 Author Report Share Posted May 21, 2020 1 hour ago, Swarf said: Quick google suggests you need the chundercat loom and cdi. To run tps, yes. The garage / dyno man says hes pretty sure it's an ignition thing ... And the standard flywheel doesn't fit on the crank end, which is odd. The only reason for that would be changing the crank and the only thing I've see doing that is stroking the engine Quote Link to comment Share on other sites More sharing options...
Swarf Posted May 21, 2020 Report Share Posted May 21, 2020 I'm trying to work out how the cdi changes the timing based on the tps readings. The thundercat engine may need some sort of adjustment to run without it maybe?? All seems a bit black magic. 1 Quote Link to comment Share on other sites More sharing options...
dannn Posted May 21, 2020 Report Share Posted May 21, 2020 This chap has fucked the carbs up... 😉 Quote Link to comment Share on other sites More sharing options...
Evilchicken0 Posted May 21, 2020 Author Report Share Posted May 21, 2020 (edited) 1 hour ago, dannn said: This chap has fucked the carbs up... 😉 Bastard !!! They're not even the thundercat carbs Edited May 21, 2020 by Evilchicken0 Quote Link to comment Share on other sites More sharing options...
hybrid400 Posted May 21, 2020 Report Share Posted May 21, 2020 I run thundercat carbs on my t/cat fzr4/6 with the tps disconnected with no issues.Ive just set the tps on my fazer and trx,and am led to beleive if the tps unit is disconnected it defaults to full advance,though i cant tell you where i read it.I had a similar issue when i first built mine and it was the wires running down to the flywheel,they had become corroded and had been in contact with the flywheel itself,hope you get it sorted though boris 1 Quote Link to comment Share on other sites More sharing options...
Evilchicken0 Posted May 22, 2020 Author Report Share Posted May 22, 2020 On 5/21/2020 at 9:51 PM, hybrid400 said: I run thundercat carbs on my t/cat fzr4/6 with the tps disconnected with no issues.Ive just set the tps on my fazer and trx,and am led to beleive if the tps unit is disconnected it defaults to full advance,though i cant tell you where i read it.I had a similar issue when i first built mine and it was the wires running down to the flywheel,they had become corroded and had been in contact with the flywheel itself,hope you get it sorted though boris I'm running a 4JH cdi, the 4jh didnt have a TPS. The wires to the flywheel is interesting, if I can get the (standard) flywheel (with magnets) onto the crank that might help 1 Quote Link to comment Share on other sites More sharing options...
hybrid400 Posted May 23, 2020 Report Share Posted May 23, 2020 Mines running a 4jh cdi too boris. 1 Quote Link to comment Share on other sites More sharing options...
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