Just trying to set up my new Viper engine in my 250 Nat kart.
1: What size front and rear sprockets do you run at lakeside and QLD raceway?
2: Where do you mount your coil? What plugs into the coil? ( it's been a long time since I've touched a coil)
3: Is there any particular spark plug to instal vs the standard CR plug?
4: Do you need a catch can for the carby/Engine overflow?
5: How to adjust the chain, I'm assuming that you adjust the adjust the two brackets that attach to the rear engine mount.
I'm sure there will more questions to come as I work my way into it..
Cheers
Craig
Comments32
Re: New to superkarting, general questions
4/ Yes. By the CAMS manual it is 250ml per outlet.
5/ There should be a link off the rear engine mount that is hard mounted to a bearing carrier by memory and is adjustable in the middle. That does your chain tension. The other on runs on a bearing attached to the axle. This is set so the bearing is not loose in the bit that sits over it but not too tight either. This keeps the distance between the 2 sprockets close to being the same under load as when not under load. It stops the axle pulling forward and the chain skipping.
Re: New to superkarting, general questions
You must have 2 large earth wires off the coil to the engine and check them for breakage all the time if the earth fails it burns the ign out
ask Viper the rest
Re: New to superkarting, general questions
You are about to hit a learning curve like the North face of the Eiger!!
I'll post up a few pictures to help you from work tomorrow.
Does anyone know approx. top-speed at Lakeside and QLD so I can give Brooksy a start gearing?
You have a low first (28 Tooth output shaft) and low top-gear (22 Tooth mainshaft) in the box.
21/24 will give you 122.2 mph at 11,000rpm (195.4kph)
22/24 will give you 128.0 mph at 11,000rpm (204.8kph)
You'll be making peak power at around 10,700. Shift at 10,900 and gear for max speed at 11,000rpm. Change the piston every 2 meetings (genuine Honda A piston) and bottom end rebuild once a season if you stick to the parameters above
Your installed jetting will be rich on Avgas 100LL. Rich is good. Just as long as it will pull off the bottom and pull clean up to 11,000rpm in top that's fine.
Try and get someone to help you at the track, who knows which way is up and can walk, talk and chew gum all at the same time!
If you want 10 different opinions . . . . ask 10 different people ;)
Run it in nice and easy, that's got a brand new crank, mains and piston . . . . . it's a monster of an '01 and it was too bloody cheap!! :)
2. See SAFE'S Answer. If you mount on the engine, you may have to extend the harness wires. The coil wires on the harness are together. The female spade goes on the male spade on the coil and the ring terminal bolts to the laminated coil pole this MUST also be earthed back to the motor. Those coil wires are fragile. It's eay to break the wires internally close to the terminals. pull on the terminal, NOT the wire and ispolate the from vibration). The big thick wire with the plug cap on the end goes on the plug ;) The other 2 wires grouped together (male and female bullet connectors) are for a kill switch/button (optional).
3. DON't use the standard CR250 plug. Good is NGK R7376-10. This is an Iridium resistor racing plug with a fine wire side electrode.
4. and 5. See the Ex Cooks answer.
Other light-hearted tips:
Full Throttle is good
Zero throttle is good
Any throttle inbetween is risky :o
The best part of the racetrack is the black bit, usually between white lines.
Hitting something solid could well cause pain and suffering, but luckily that's usually confined to the wallet area!
Find your own limits. When someone tells you it flat in top, what they usually mean is that someone else told them it's flat in top!
A superkart is fitted with powerful brakes to give short stopping distances. Use them and keep the engine for acceleration. Don't join the early downshift club. There's no award for 12,500 on the logger.
Seizing the motor is not good, not clever and is never the tuner/engine builders fault.
Engines make power, drivers make lap times!
Enjoy.
Best Regards
Ian :)
Re: New to superkarting, general questions
Re: New to superkarting, general questions
Thanks for your detailed answers Ian as well as your friendly advice! :o
Re: New to superkarting, general questions
What's the mixing ratio for fuel to oil?
Re: New to superkarting, general questions
25:1 always works well or 4% if you prefer it that way.
Avgas and A747?
Best Regards
Ian
Re: New to superkarting, general questions
Yes, I have the Castrol A747 to use...
FYI, got the pipe all sorted on the weekend, it's tight but it now fits with the smaller engine mount.
Cheers
Brooksy
Re: New to superkarting, general questions
I have hooked up the coil as per your instructions,
Female spade to male spade on coil
Ring terminal on the bolt at the top of the coil
The earth wire was on the bottom of the coil which I have bolted onto the engine.
BUT The button connectors I have going to the male and female on the map switch (from ignition) is that correct?
There are no other wires to connect any kill switch.
The wires coming out of the engine are,
red spade and black ring going to the coil, The harness then connects to the ignition with the bullet connectors connected to the map switch.
I'm down at work for the week so I can't take a photo (which would make it easier to explain), so have tried to describe it to the best of my ability.
Can you let me know if I have done it correctly? I might see If I can call in and see Ants kart to make sure it's ok....Don't want to fry any ignition before I even start!! ;-)
[quote author=Viper Racing UK link=topic=2284.msg25238#msg25238 date=1391491033]
2. See SAFE'S Answer. If you mount on the engine, you may have to extend the harness wires. The coil wires on the harness are together. The female spade goes on the male spade on the coil and the ring terminal bolts to the laminated coil pole this MUST also be earthed back to the motor. Those coil wires are fragile. It's eay to break the wires internally close to the terminals. pull on the terminal, NOT the wire and ispolate the from vibration). The big thick wire with the plug cap on the end goes on the plug ;) The other 2 wires grouped together (male and female bullet connectors) are for a kill switch/button (optional).
[/quote]
Re: New to superkarting, general questions
AASA Insurance
While competing as a competitor in a AASA event, are you covered by any personal injury/public liability insurance under the AASA?
The reason for the question is that I just upped my life insurance but they EXCLUDED any form of motor sports
I need to be covered for personal injury or death while competing. So will I have to take out another policy that covers motor sport or is it covered as a competitor by AASA?
Cheers
Brooksy
Re: New to superkarting, general questions
That's a link to QR's terms and conditions, They do have public liability insurance but when you sign the entry form you acknowledge that motorsport is dangerous and could potentially kill you.
Cheers
Tim
Re: New to superkarting, general questions
I just tried a new 520 x ring chain on the kart and it looks to big for the sprockets, what size chain do you run?
Re: New to superkarting, general questions
We use this chain all last year with no failures.
Re: New to superkarting, general questions
Glad you got the pipe fitting OK. It might not help if you had the link pipe welded when you were trying to fit the pipe with the wrong mounts as now it won't be the ideal shape. The first one is always the hardest, believe me when you've done a hundred or more it's piss easy ;)
This is a picture of the last design of pipe without the slight kick at the back of the expansion chamber, which was a little more challenging to fit :o
[URL=http://s186.photobucket.com/user/Viperracinguk/media/pipeafter.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/pipeafter.jpg[/img][/URL]
Your wiring sounds fine, but by all means post a picture if you want to confirm.
The wires on the Map switch go straight to the wires coming out of the red CDI box.
The kill switch wires/bullet (not button!!) connectors will be taped to the harness and hidden by the tape. If you want to use them just look for a bulge on the harness (you should be able to feel the connectors through the tape), then cut away the tape to reveal the connectors.
Here's a picture of a similar ignition. The harness is slightly different, so don't get hung up on that, but you can see the map switch and the bullet connectors for the kill switch poking out of the harness at the top.
[URL=http://s186.photobucket.com/user/Viperracinguk/media/02hpi.jpg.html][IMG]http://i186.photobucket.com/albums/x26/Viperracinguk/02hpi.jpg[/img][/URL]
This gives you a tour round our CR250 fitted with the EVO cylinder and crank. Some good general layout views and of the coil mounted on the Anderson mount. Just click on the link: http://www.youtube.com/watch?v=hl7RnC9ay8U
Most critical is the earth from the coil to the motor and the earth tag (ring terminal) on the harness. It is easy for the wire to the ring terminal to break internally and for it to still look fine externally. Try and isolate from vibration as much as you can. If you loose the coil earth or the earth tag wire breaks it will backfire, pop and bang and may well pop the genny!!
428 is the correct chain, but make sure you get the HD (Heavy duty) version, which has a much higher breaking strain.
The reason for using 428 rather than 520, is that for a given sprocket diameter you have more teeth, hence a 1 tooth change is a smaller percentage . . . . so finer adjustment of the final drive gearing.
Dalton, R30 was a 100% castor (ground nut oil). A747 is a semi-synthetic with a castor base . . . . but it smells the same ;)
Best Regards
Ian :)
Re: New to superkarting, general questions
We're using 428 Chain. http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=271392379631
We use this chain all last year with no failures.
[/quote]
That's the chain we always used on our twins and had 0 faulures in 6 years at or near the front of the game. You do need a G clamp type chain breaker even to insert the loose link prior to inserting the circlip. We changed it every 6 days of running though. 2 chains out of 136 links.
With a National you can get away with a thinner linked 428 chain but you should change it every 3 meetings max to avoid a failure. These type chains dont need the chain breaker to assemble the loose link before the circlip. Always use a brand new joining link set each time.
Re: New to superkarting, general questions
What are the 4 loose "O" rings in a bag labeled "2 sets of O rings for neck"?
Cheers
Brooksy
Re: New to superkarting, general questions
Re: New to superkarting, general questions
Re: New to superkarting, general questions
Ian, isn't A747 the new Catrol R30?... :-\
[/quote]
Dalt - R30 & R40 has been around for close to 100 years. Castor Oil was used in most 1st World War aircraft engines and gave the pilots constant diarrhoea from continually breathing the fumes. You could say they were 'shitty' pilots :-) (Groan)
BTW - the trade name CASTROL comes from CASToR OiL
Re: New to superkarting, general questions
1, So, I have signed up for a race license. Do you actually get a physical license or do you just have to remember your license number?
2, Do you physically get a membership card for QLD club? For buying fuel etc.
3, When applying for a race license it asked me for a race number, at the time I didn't have club membership. I put in a number that was available at the time (28), since then the club has issued me with another number (54). Is there any way to change my number on the QLD raceway website as it has me racing this weekend with 28. Can I change it on the day with the clerk of the course?
4, The answer to the question above? do you put rubber O rings on the exhaust/pipe connection??? seems wrong? high temps and rubber?? ??? ??? ???
Cheers
Brooksy
Re: New to superkarting, general questions
Re: New to superkarting, general questions
You'll have a physical licence turn up in the mail shortly. You'll also get a club membership card turn up in the mail once the guy who does our membership stuff gets back from holidays. Not sure how good either of those will be for buying fuel, I've always had to use my cans licence but I could be wrong, ask around I know their a guys without cams licences getting fuel so there must be a way, I just don't know it.
Our club runs it's own number registry, you will have to call the race secretary/club membersip/ treasurer (they are all the same person) to find out what is available and what you can have. Like I said, he's away till friday but if you need to change it urgently for the weekend he's more than happy to take a call on his mobile.
yep we run O rings in the manifold of our exhaust, they seem to run fine, just have to replace them every few meetings or they go fairly hard...
Hope that helps.
Re: New to superkarting, general questions
The licenses and numbers seem all sorted out, will be running #54
I will need to find fuel for Sunday, I have enough for Saturdays practice. Anyone have a spare 20l I could buy off them till I can work out where to get fuel without driving to Sandgate QLD every time I need fuel?
Cheers
Brooksy
Re: New to superkarting, general questions
Thanks Dan Lewis for the phone call and the offer ;D
Re: New to superkarting, general questions
OK, wasted a 1/2 day of practice trying to get my kart started. The kart has been started for a whole 30 sec since rebuild (by Viper). so this Kart still needs to be run in
Can't get any spark from the plug. when you pull the cord to start it you get minimal spark.
Things we have tied,
[list]
[li]Changed the plug to see if the new plug was the problem
Got the multi meter to check power coming from the ignition (which there was) when turning the wheels in gear. It's a brand new Ignition from Ian at viper.
Got the multi meter on the output of the coil (spark plug lead) and found that there was no output when turning the wheels.
Bought a new coil and just tested it again and still have the same problem, little or no spark at all
Cranked the wheels to make sure the fuel pump is working (which it is)[/li]
[li][/li]
[/list]
OK, now I'm stumped! ??? ??? ??? Anyone have any ideas???
I'm thinking of coming down tomorrow (lakeside) with the kart to see if anyone could give me a hand or offer any suggestion's of a fix?
If anyone has a spare HPI Ignition so I could try and swap It to see if the ignition is the problem.(CR 250cc 2001)
http://i373.photobucket.com/albums/oo174/fatbloke49/20140329_155638.jpg
http://i373.photobucket.com/albums/oo174/fatbloke49/20140329_155600.jpg
http://i373.photobucket.com/albums/oo174/fatbloke49/20140329_155614.jpg
Any information would be appreciated
Brooksy
Re: New to superkarting, general questions
Watch this space as people reply but if you were scheduled to go to lakeside GO.Go early & some guru WILL help you. Even if you only get a session in it!
Re: New to superkarting, general questions
Also don't turn the engine over without the plugs in the cap and earthed to something like the head. The ignition will need to discharge. I will be there in the morning if you need any help.
Re: New to superkarting, general questions
Re: New to superkarting, general questions
Does anyone have a timing light and does anyone have an old NGK R7376-10 plug that I could try?
See you all tomorrow.
PS, I will have the Race Tech colored kart, so feel free to come over and say Hi
Re: New to superkarting, general questions
Cheers
brooksy
Re: New to superkarting, general questions
Re: New to superkarting, general questions
By the way I'm in S.A.
Cheers