I put my motor back together with the sparks 102mm JE 12.5:1, flowed head, 1mm bigger intake and exhaust valves, Web Cam and valve springs. Here is my problem, I have to much compression and my battery and starter can't handle it. I bought a new interstate battery but that didn't help. It cranks really slow. I put the battery charger on start mode, and it will fire right over,and once the quad is warmed up you can turn it off and it will start right back up. But, once it cools it doesn't want to crank fast enough to start it. Does anyone know of a better starter or a higher amp output battery?? Please help!!


Thanks

By the way the quad rips, and the motor is awesome.

 

Shoolz- i can imagine your probs. I sometimes wonder about my 11-1 686. I was thinking of a new battery myself as my raptor is 14 months old. What is sparks solution?

 

By the sounds of your problem you just need a larger capacity battery, when you use the battery charger it starts. The battery can't keep its output high enough to turn over your high comp engine. Try this disconnect the battery, now use jumper cables and hook it up to your car (not running). If it's cold and starts no problem you have just answered your question, battery! Not all batteries are the same. Some are overrated what they claim as cranking amps or amp hours is a stretch, ask the dealers what they think would be the best brand battery.

It would be a lot cheaper to get a new battery than a starter [img]i/expressions/face-icon-small-happy.gif[/img]

 

I just bought a new interstate replacement battery on saturday, because I thought it was my stock battery that was bad. But that battery can't crank enough either. But, It does do better than the stock one.

 

I've asked others about starting with a hi compression piston & they didn't have any problems.
Make sure your decompression device is functioning properly.

 

I would get your batteries load tested, this will tell you the real rating of the battery. You can't always trust the label, it wouldn't be the first time a battery was miss labeled. But it couldn't hurt to check the decompression unit. This way you will know that you aren't over drawing on the starter and cook it.[img]i/expressions/face-icon-small-shocked.gif[/img]

 

Mine turns over fairly hard occasionaly, just depends where the engine stops. Once I installed the kick starter it wasn't a problem anymore! Just kidding.

 

According to Pam @ Powroll she said it is all 12.5:1 comp pistons only fix is replace with
lower comp piston my fix was higher cranking amp battery works great...If it
keeps giving you problems without fixing it will maybe take out your starter relay assembly
cheap but anyway hope I gave a little insight......

 

..Also about using your
car or truck for jump not good on starter it turns it to fast and makes funny noise..

Ok tell me what makes it turn to fast. 12 volts DC in any size battery is still 12 volts DC
If a starter is rated to draw 100 amps and your battery has a 100 amp cranking capacity the starter will draw the batteries max. The same starter with an 800 amp cranking capacity battery will still only draw 100 amps. It just means it can sustain this out put for a longer period of time. Now if you do jumper it to a car or truck while it is running you are now using 14 volts or more depends on the out put of the alternator, this is over driving the motor that's why it is turning to fast.