BAJA SRT4 100cc gasoline twin cylinder 2-stroke 1/4 scale

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wishes you get well soon and look forward to see your great work.:)
JariV said:
No updates now. I decided to get rid of the pullstart and make an electric starter. Just bought the gears for that last Friday. Pullstart was way too heavy to use and cords kept snapping very easy.
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New starting system designed, manufactured and installed. Battery drill is the tool spinning the long starter axle facing rearwards. Tried to start it last night but the engine failed to start so far. Starter worked very well and it is easy to use.

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Added later on:

I think I found out the reason why the engine failed to start. Too long and too small ignition module wires. I will replace the wires with heavier wires and try again. And after I get it started I will tune the carb and ignition and keep on checking the temps. Then a drive test to see if the driveline holds up. If it doesn't then I need to update the driveline with stronger parts. After that I will go to a chassis dyno to see how much it will put out.
 
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After a long fight with ignition problems:

This is the FIRST EVER start of this engine. All tuning is in the woods. Only assumptions so now the tuning starts because it works. We got it running (I'm the tall guy in the video) but halfway of the video one of the spark plugs die so the latter part it only runs on one cylinder. Temps 130 Celsius. Revs like crazy, clutch engages at 6000 rpms. All systems working but I need to make the starter system better.

I am the tall guy on this first video.


Second video of the the same situation as the first one:

 
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It felt like winning a lot of money on lottery... i just could not believe it and my hands were shaking like hell even half an hour after this. A true adrenaline rush.
:D
 
I need to start testing it and I need to improve the starter system some more. It is working but needs two hands. I will modify it to be operated with only one hand.

When I have done all that I will start bashing. This will not happen in a couple of days though. Stay tuned.
 
atom3624 said:
Yeah, but yours should be with slicks on slot mag wheels, with a metalic blue Camaro body with white rally stripes ..... :lol::lol::lol:

Al.
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I'd love to get a camaro shell for the 4wd im building at the moment, but i have yet to find one!!
But it would have to be orange with white rally stripes!!

Chris:D
 
Here's what I've done after the first videos:

- new starter/work bench
- lots of parts becoming loose all the time, so mainly looking after that and applying threadlocker
- few small design error fixes (shimming)
- carb tuning today and ignition check and temperature checks

So the usual basic stuff, nothing that interesting. I took a new video but it is practically nothing that you haven't already seen before. One good thing is that even with incomplete carb tuning the engine idles very nicely at 3000 rpms. With a little additional tweaking I'm sure it will decrease even more. My target is to have a reliable idle at 2500 rpms. I also drove the car today for the first time. Sorry, no video about that since wife was out and so were the neighbours.

 
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I decided to add more strength to the drivetrain. I took out all 3 plastic differentials and replaced them with aluminum differentials. Earlier I thought that The billet aluminum housings with plastic differentials would be enough but now I don't think so anymore. I also added an adjustable Limited Slip (adj. between 0<->90%) system to the center differential and aluminum center diff mounts. So now the entire drivetrain is 100% metal.
 
I'm attending Europe's biggest RC-show on 27-29 April so I don't want to destroy the car before that :D

Nor scratch it too much.

And the weather is horrible, water everywhere as the long winter is over and snow melts.

EXCUSES I KNOOOWWW :D
 
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