petsie

Hi, ive just bought a rx7 and when i go to start it it back fires out the carby, could it be the plug leads on in the wrong places, i havent had the time in the last few days to take a look, but thought id ask the question. Its my first rotory car and it come with two extra 12a and a 13b with two manuel boxes and 1 auto, picked up at a good price so if i have to do some extra work ill fit one of the other good engiens in, but if i can sort this one out it'll stay as is. Its a 12a with 5 speed. Hope some one else can help me alittle. Thanks

Kentetsu

Yeah, I'd check to make sure that the spark plugs wires are correct. Positions should be marked on the engine (L1,L2,T1,T2) by the plug holes, and possible on the distributor cap as well...

petsie

im still haveing trouble, all leads are on the right way, after playing around awhile descover i have two dead plugs. would that stop the motor from starting up. i have new plugs orderd, will try them tomorrow and see if i can get some fire in its rotors. So can some one tell me weather or not that two dead plugs will stop the rotory from fireing up, it my first rotory car ever owned and all help is grate full, its a 79 mod rx7, 12a, 5 speed, picked up at good price for a play thing.

RXnos1200

iTrader: (24)

What do you mean by 2 dead plugs? Not sparking? What year is the 7? If there isn't any spark then you could have a bad igniter. Is it the leading or trailing? need more info......

petsie

its a 79 model, its not the leads and igniters, i put the plugs that where good into the leads of the ones that leads of the dead plugs and theye still fired. and i put the dead plugs into the other leads and theye still didnt spark. i got new plugs comeing today and hope theye sort everything out. im not shore in witch position the plugs where from brgining cos i pulled them out and cleand them up cos when i tryed to start the rx7 when i got it it back fired out the exhast. hope this helps alittle. Ill let you know later tonight after i get new plugs in and see what happens.

Vashner

You do have a fire extinguisher handy right? I have seen that bake a few cars. My friends 302 boss 69 mustang went up in smoke over a carb fire.

petsie

yeh i have, but its cool, the people i bought it of said last time theye started it, it poped threw the carby, but whent to start it it back fired threw the exhast. im hopeing to get it going soon, even if i have to spend the time and put another motor in, it come with a couple of good motors and boxes and a 13b for rebuild. so theres more than one way to skin a cat.

petsie

I put a new set of plugs in today, before i did that i made shore all foure where fireing and theye where, so i put them in, and cranked it up and all that it was doing was smokeing out the exhast as i cranked it over and over, tryed retiming and moveing the dizzy a bit and just the same thing as it cranked over just smoke out the exhast. Would the apex seal case this if worn???, if so looks like a trans plant of a new motor and sit this one aside for reco. Well im hopeing to get it going some time soon.

Macasdude

did you ever find the answer?

Vashner

Hum any rotary mechanics in your area? Maybe get a 2nd look before you dig the 6 foot hole on it?

petsie

Finally my new 12a has arrived, still haveing no luck with the motor in the rx7, its got electronic dizzy and igniters on the shocker tower all are working fine still turn her over and smoke out the exhast, have noticed when switch the ignition on the tacho comes up to about 5 grand and when turning over bounces up and down, Is that normell? some times it will back fire out the exhast but it will not fire up. new battery plugs and leads, its got me buggerd. I just got her cleaned up to day, its a little waste of time polishing her up since she needs new paint, but what the hell, she looks alote better. will get a pic up some time of the frog. dont know to repaint the same coulor or different, looks good in green so i might stck with it. Well i dont know what more to do but put the new motor in, its a runner, if problems are still there, i dont know. well ill keep yous all posted in how things go in transplant, hope to have a crack over the next couple of weeks when things cool down here in OZ, been a stinker the last few days. Thanks all that have helped, but well over come this problemb one way or another. :

Kentetsu

Sounds like she's flooded. Dump a couple caps full of oil down the carby then try it again...

petsie

Ill give that a try, ive pulled plugs out and have turned it over for a while to get the extra fuel out and blew out the plugs with air to get the fuel off them, but no luck, ill try your oil tonight and see what happens, thanks.

Mazdahead

Check the compression. Sounds like it has been sitting a long time? If the compression is good, it should fire, but I suspect one or more of the apex seals might be hanging up making poor compression. One remedy is to pour some ATF down the carb with the plugs out and turn it over until you see ATF coming out of the plug holes. Let it sit over nite and re-check the compression, should be better now. This may actually take a few times and a bit of effort, but should remove any carbon or at least allow the apex seals to move again. Replace the plugs and give her a shot!

Kentetsu

Don't use ATF, just stick with the Seafoam. Does the same thing, but won't harm the soft seals...

petsie

yeh, mazdahead its been sitting for about 10 years in a shed, we pord some oil down the carby before trying to start it, may be the apex seals might be totally buggerd. Whats seafoam, ive never herd of it before?, is atf safe to use cos i dont know eney where in my small town where id beable to get seafoam from thats all, would two stroke motor bike oil do the same thing, she might blow some smoke, but id rather ask the questions before doing it case something goes wron and regret doing it. Thanks all for your help, its nice to know that theres guys and girls out there that help one and another its really grate. Cheers Peter

djessence

www.seafoam.com

Meant to be burnt vs ATF is not. There is always an ongoing battle about ATF. Seafoam cleans everything out of the engine and can deflood it as well. Meant to be burnt in any 2 or 4 stroke motor. Do a quick search about seafoam and you will find out all you need

Can usually get it at alot of automotive stores.

Just noticed you are in australia, I'm not sure if they have it there, It probably says on the site

petsie

Ive tryed a few of the major parts supplyer and theye dont stock the seafoam, is there eney other product that could be used, some times OZ can really suck in getting stuff, some times i wish i lived in the states. I just sent an email at seafoam to see if there is eney where thta sales there product and go from there. If theres eneything alse i could use that does the same job can you please tell me cos ill try eneything at the moment. Thanks all. Pete

Kentetsu

If you can't get Seafoam, just use regular motor oil. However, you will have to clean or replace your plugs afterwards because they'll get pretty gummed up from the oil...

petsie

Thanks Kentetsu, ill try over the weekend, i got an old set of plugs i can put in and then ill put the new ones back in after. It will never get the better of me, not in a million years, Thanks againe everyone for your help. Cheers Pete

bliffle

2-cycle oil is probably better.

petsie

I used two stroke motorbike oil, its been sittin for a few days, finally fired her up today at long last, then she cut out and i tryed starting againe and no luck, i think it might be transplant time, im goin to try againe later when my battery charges up againe and see what happens, but it was good to see her kick into life after all this time. Thanks all for your help and see what happens next. Cheers Pete

petsie

Finally had the time to pull the old motor out and put the new one in and its all good, finally get it all together over the weekend and fired her up. Shes perring like a kitten, Just gotta get her painted and finished off put the new 17 inch rims on and get her on the road. Finally getting some where. Thanks all.

Kentetsu

Thanks for the update man, glad to hear you're on the road again...