Recent content by gt alex

I broke down on my test ride last week I think I found the problem. I lost the vacuum plug I was using on a T piece on the hose to the petcock and in my impatience I used a screw to block it. But it did a bad job. I found it using a hand vacuum pump, Unfortunately we are in lock down again so I...

I spun the carby 180deg now opening towards the rear cylinder and idling at 1400rpm, pulling the front and rear plug both plugs had similar effect but the idle exhaust sound was not even. So it looks like it will be worth making an adapter to run the throttle across the plenum.

I just fitted a 3/8 id balance tube a fraction larger than the first one and I didn't notice a change but the idle still fluttering on the rear can now go down to 1600rpm which is almost a win except spluttering between 1600 and 1800 will equate to a flat spot. So I will try to fine tune best I...

I just fitted a balance pipe and although not the magic bullet I hoped for it has defiantly changed things for the better. I can now get a stable steady idle at 1800rpm with just a bit of fluttering from rear cylinder misfire. Any slower and the rear cuts out. no stopping and starting the rear...

It seems the rear cylinder is running lean at low rpm I suspect I its to do with the uneven firing order the air/fuel mix has more time to stagnate and stop flowing as opposed to the front where the flow is still going stared buy the rear. I am thinking of running a 12mm tube from the manifold...

after using sealant on everything and putting a temporary deflector under the carb towards the rear still no go but the rear is lean?

Just checked valve clearances right on spec min clearance, ideally I would have liked a couple of thou more but I am ruling that out. I think that just leaves my manifold ether still leaking or design. so first step putting non hardening fuel resistant sealant on all mating surfaces. then if no...

Rear cylinder is still not playing the game. With idle set 2000 rpm It idles 5 seconds then the rear cuts out And runs on the front for 10 seconds at about 1000 rpm and keeps doing this. "Seems" to run ok 2500 and over. The coil checked ok I put a wire across from the + front coil to the rear to...

It handles great the geometry is still conservative when compared to how high racers raise the tail on these bikes. the rear is standard height with shorter dog bones to compensate for the 8mm shorter shock. And the front as you saw it is pushed through 38mm and has a .90 spring, a gold...

We did well, the the water tanks and the dam are full.

I through myself a curve for a couple of days by not pressing to rear of the manifold all the way home. but I should be back on track now.

Success is not guaranteed This is not paint by the numbers. This item was not sold equipped to suit the bike. These were sold pre setup for an application but could easily suit similar applications. This is far from a chevy 6 but it is coming together. I fitted the spray bar with smaller fuel...

Ok. Time for an update, If idle speed is correct too much fuel is being delivered thru out the whole range. If I adjust for a 3500 rpm Idle I can get it all good. So I am going to try a 2nd spray bar I have for the 100 hp version which has smaller holes I am not sure of compatibility with this...

My air filter just arrived and I am booked in for dyno tuning 14 Jan 21. It took a bit to find a dyno operator willing to try something a bit different. some wont look at anything that is not EFI. I have worked out the throttle linkages but havn't fitted them on yet.