Author Topic: EFI Bighorn (Read 30148 times)

Jeram · « **Reply #30 on:** October 07, 2012, 01:30:45 PM »

Quote from: Uniflow on October 03, 2012, 03:06:56 AM

Just found another problem. When the voltage goes below six or seven volts ( old battery ), the Ignitec has been defaulting to some fourstroke program! Keeps looking for a cam sensor, no spark. I've changed the default to the program I use now. There is a charging system so when the engine is running, no problem it's just if the voltage drops when starting. This system should now be able to run with just a capacitor.

Perhaps thats why my CRM supermoto doesnt like kick starts???
can you PM me with how exactly you fixed this?

my current fix is Iv installed a total loss 200gram UPS 12v battery behind the number plate. I hit a button on my throttle which connects it and turns on the ignition with a pure 12V for a few seconds till its idling nicely then I disconnect it. being a UPS battery it should last 2-3 years without being charged.

Uniflow · « **Reply #31 on:** October 27, 2012, 10:24:58 AM »

http://i1056.photobucket.com/albums/t380/uniflow/IMG_0470.jpg
Bighorn in the Acerbis four hour this weekend.

Uniflow · « **Reply #32 on:** October 27, 2012, 10:26:38 AM »

Uniflow · « **Reply #33 on:** October 27, 2012, 10:31:48 AM »

http://i1056.photobucket.com/albums/t380/uniflow/IMG_0454.jpg

TMKIWI · « **Reply #34 on:** October 28, 2012, 05:40:14 AM »

I was looking on livewire last night and wondered if the bighorn in question was you.

How did you go.

Uniflow · « **Reply #35 on:** October 28, 2012, 09:33:25 AM »

The aim was to finish and not come last. We did finish and we didn't come last! The Bighorn only did one lap, fueling issue, but it did make it back, the rest of the ( we were in the team event ) race was finished on my TT500. The only fourstroke I recognize! Bloody hard work, the holes were bigger than the TT. We got five laps in ( nearly six ) missed out by a few minutes , came 161 out of 204. We will be back next year. Those top guys are quite good! Lots of fun.

Uniflow · « **Reply #36 on:** October 28, 2012, 09:40:51 AM »

TMKiwi, Halcombe this weekend?

TMKIWI · « **Reply #37 on:** October 28, 2012, 10:14:52 AM »

Yep, I'll be there.

Uniflow · « **Reply #38 on:** December 09, 2012, 07:28:57 PM »

The new throttle body for the bighorn. The "in cable" TPS I'm using is not accurate enough.
This unit will have the TPS on the end of one of these shafts. Hole is 36mm, shafts are 8mm
This is a ball valve type throttle body to replace the slide type I'm using now. Air is drawn from the cavity on the side of the engine so no air cleaner is needed to bolt straight to the throttle body like a normal twostroke ( modern reed type ).

Jeram · « **Reply #39 on:** December 10, 2012, 01:25:10 AM »

interesting,

did you try the RGV style TPS's where you run a cable spliter to a frame mounted TPS

Uniflow · « **Reply #40 on:** December 10, 2012, 01:51:35 AM »

I would take a picture of what is in there now but I'd be too ashamed. It's something I've cooked up myself ( in a hurry to get it running ). Now I'm not so sure it's reading right all the time with cable flex, grit etc. The best way is to mount the TPS on the end of the throttle shaft, no flex there!
The ball valve should make a good throttle valve,when the ball valve is open there is no restriction to airflow, no gaps, no needles, no butterfly, nothing but a nice big bell mouth straight in. Plus it shortens the intake path a little more too.
Jeram, what happened too this Bighorn road racer guy that was going to get back to us? On NATF