my stroker engine problems

[NEVERFASTENOUGH]

please help i have a 97 shee i just had the engine redone with a 4m 5m hotrods stroker with hot rods stroker pistons to match and spacer plate i had the cylinders bored to 65.50 mil i also have a mod quad cool head with 19cc domes and v force 3 reeds and pro flo intake boost bottle stock carbs with a 280 main jet i just got the engine together yesterday and im havin a hard time starting it , it wont start till i pour gas into the carb then it will fire up and sounds pretty good but wont idle ive cleaned the carbs and it wont make a difference im trying to break it in right now after i ride it around the yard it will idle for about a minute and shuts down this is my first banchee i have tryed every thing i kno if you guys can give me any advice its much appreciated i dont wanna screw this engine up i spent all my savings on it, maybe it needs bigger carbs or timing work im not sure and i also think my cylinders have a stock port job. i juss wanna get it running right so i can go kick sum 4 stroke ass do u think this machine will scream thanks guys

[moneybags]

I think that with the mods you have. A 280 main sounds realy small. What size pilot are you running.

We will need to know your riden temps and how far above sea levl you are.

 

Are you useing the 796 series pistions?

Are you useing a spacer plate?

[burleybanshee]

I am having same thing done to mine right now minus the spacer plate. I would look into having your domes cut and lose that spacer plate. I am having a dune/play port done to my jugs and they have to it for the 4mil 5mil crank/rod. The port timing is different, not sure if the spacer plate eliminates the timing difference or not. I have brand new 30mm oko carbs putting on. Wish I had planned on doing a 4mil before i bought the carbs, would have gone with 33pwk's. Your carbs need a lot bigger mains, idle, needle for the added cc's you are running. Need to post temp, elevation as well. Another possible problem would be the 19cc domes depending on elevation, may ned to run race gas due to compression levels. I would not run it until you richened the carbs and checked your compression levels. Get a good compression gauge and screw it into the cylinder head. Hold open the throttle and kick it over several times until the reading steadies. Over 150 look into race fuel. Also going to need to do plug chop. Read up on the threads here at hq regarding how to do a correct chop and reading as well as jetting and what effects each part of the rpm ranges. You have a lot to do. It can seem overwhelming at first but take your time and you can do it. You came to the correct site for info and there is a lot of people on here with vast knowledge that can help you do the fine tuning once you get it close.

[NEVERFASTENOUGH]

my mistake its a 270 main jet and everything else in the carb is stock im riding in michigan so my riding temps r from 25 degrees being the coldest ill ride in the winter and summer 60-80 degrees my mechanic said with the 270 main it would run good i would juss have to take the lid of the airbox in the summer and keep it on in the winter so do u guys think i should change the main jet cuz it wont even start till i pour gas in it then it fires right up and runs pretty good but wont idle

[Snopczynski]

Is your float level in the carbs adjusted properly, is the choke balance tube on also? When it doesn't run, does it still have spark every time? Will it start with the choke on? Check those items, then report back.

[blazin sti]

Is your float level in the carbs adjusted properly, is the choke balance tube on also? When it doesn't run, does it still have spark every time? Will it start with the choke on? Check those items, then report back.

 

 

I think with that kit you would need to increase the size of the carbs.I have a 404 bigbore and my 28mm carbs are just able to handle my setup.You should buy some 35mm carbs for that kinda setup.Idont know if thats the problem but you should look into that too.Good luck

[Screaming Yellow Zonker]

it sounds like you need to step up your pilot jets a few sizes. With more displacement you need more fuel but with your stock settings that won't happen. And at idle your main jets don't do too much.