300ex JE big Bore kit questions

[300ex965]

Hey guys i have been checking out this big bore kit on ebay made by JE http://cgi.ebay.com/ebaymotors/HONDA-TRX300EX-330CC-JE-BIG-BORE-CYLINDER-KIT-TRX-300EX_W0QQitemZ230363809429QQcmdZViewItemQQptZMoto rs_ATV_Parts_Accessories?hash=item35a2c0c695&_trksid=p4506.c0.m245. Well i have some questions about it.
1.Is the electric start on my quad still gonna work after this is done?
2.Am i gonna have to run higher than 93 octane gas?
3. Is this kit going to affect reliability?
4. Should I change anything else in the motor to get the most out of the big bore kit.
Well any help would be great thanks guys.

[m0t0xk1d]

.Is the electric start on my quad still gonna work after this is done? yes you elctirc start will be just fine. i run a 14:1 piston and my stock starter works just fine.
2.Am i gonna have to run higher than 93 octane gas? No but i reccomend you dont run any lower then 93 with that compression ratio

3. Is this kit going to affect reliability? MAybe a little bit but not very much. the kit will be just fine.

4. Should I change anything else in the motor to get the most out of the big bore kit. Well you could stroke it and that would give you more displacement(cc's) but a port and polish would really wake it up along with a good cam and exhaust system.


Well any help would be great thanks guys

Your welcome

[Tommy Warren]

first off do you know how to trim the cases for this kit?

[born2ride14]

Originally posted by 300ex965
Hey guys i have been checking out this big bore kit on ebay made by JE http://cgi.ebay.com/ebaymotors/HONDA-TRX300EX-330CC-JE-BIG-BORE-CYLINDER-KIT-TRX-300EX_W0QQitemZ230363809429QQcmdZViewItemQQptZMoto rs_ATV_Parts_Accessories?hash=item35a2c0c695&_trksid=p4506.c0.m245. Well i have some questions about it.
1.Is the electric start on my quad still gonna work after this is done? no
2.Am i gonna have to run higher than 93 octane gas? yes
3. Is this kit going to affect reliability? anytime you do anything after market to a motor yes but this wont be much
4. Should I change anything else in the motor to get the most out of the big bore kit. port polish oversized valves 400ex carb
Well any help would be great thanks guys.

[300ex965]

thanks alot man and i have seen your 300ex in other threads its pretty nasty man.

[m0t0xk1d]

not trying for this to be a jerk? whose 300 you talking about?

[300ex965]

I was talking about your 300ex m0t0xk1d, and no I do not kno how to trim the cases. I was gonna ask but i figured it would be an easy task.