Big Bore Electric Start Problem

[Johnny Tran]

Hello guys, I'm new here and I only speak english so please help me if you can. My engine mods are:

UMA 62mm Block
30mm Carb with bigger jettings (not sure what size)
BRT CDI
Vixion Stage 2 Cams
AHM Pipe (newest model)

The problem now is that my bore is so big that it's hard to fire up using the electric starter so I have to frequently kick start but even that's a pain... My mechanics say that it's b/c I'm in high compression but I don't know what this means. Someone please explain to me what I can do so that I may use the electric starter again since I will be getting a full body fairing kit that will cover the kick starter (ie: Will a Racing Ignition Coil help??) Thanks!

 

[SPEED RACER]

Hello guys, I'm new here and I only speak english so please help me if you can. My engine mods are:

UMA 62mm Block
30mm Carb with bigger jettings (not sure what size)
BRT CDI
Vixion Stage 2 Cams
AHM Pipe (newest model)

The problem now is that my bore is so big that it's hard to fire up using the electric starter so I have to frequently kick start but even that's a pain... My mechanics say that it's b/c I'm in high compression but I don't know what this means. Someone please explain to me what I can do so that I may use the electric starter again since I will be getting a full body fairing kit that will cover the kick starter (ie: Will a Racing Ignition Coil help??) Thanks!

bro, you have to replace your starter motor with bigger one that can handle up to 250cc.
we have same problem.

 

[Johnny Tran]

Ah ok thanks bro! Where can I buy the motor? and how much? Also, will I have any problems with the stock battery if I change to the bigger starter?

 

[SPEED RACER]

Ah ok thanks bro! Where can I buy the motor? and how much? Also, will I have any problems with the stock battery if I change to the bigger starter?

in our place here in cebu we have many starter motor ( brand XP starter motor for big displacement engine )
selling price php 1,900.
you can use your stock battery.

 

[Johnny Tran]

Thanks again for all the info!

 

[SPEED RACER]

Thanks again for all the info!

your welcome bro..

 

[turbulence]

I advise you to use LOW PROFILE CAMSHAFT bro for easy start. im using CMS camshaft and it is softer to kick than any camshaft a have tried. Kawahara stage2 is hard to start using kick. it is stiff as well as the slectric

 

[Johnny Tran]

I may consider this but how will this affect my performance if I switch to low cams? Thx

 

[turbulence]

Low cam has better acceleration and top end. Cms is not much of a low cam. Still 2mm additional valve pocket needed.

 

[transporter]

Hello guys, I'm new here and I only speak english so please help me if you can. My engine mods are:

UMA 62mm Block
30mm Carb with bigger jettings (not sure what size)
BRT CDI
Vixion Stage 2 Cams
AHM Pipe (newest model)

The problem now is that my bore is so big that it's hard to fire up using the electric starter so I have to frequently kick start but even that's a pain... My mechanics say that it's b/c I'm in high compression but I don't know what this means. Someone please explain to me what I can do so that I may use the electric starter again since I will be getting a full body fairing kit that will cover the kick starter (ie: Will a Racing Ignition Coil help??) Thanks!

bro much better to use cms cam and i was agree with the suggestion of turbulence. im using also same set up with you but i can use my starter easily fire up. i use only 28mm keihin carb and r9 mugello pipe best for top end. . .

 

[docgabby]

Hello guys, I'm new here and I only speak english so please help me if you can. My engine mods are:

UMA 62mm Block
30mm Carb with bigger jettings (not sure what size)
BRT CDI
Vixion Stage 2 Cams
AHM Pipe (newest model)

The problem now is that my bore is so big that it's hard to fire up using the electric starter so I have to frequently kick start but even that's a pain... My mechanics say that it's b/c I'm in high compression but I don't know what this means. Someone please explain to me what I can do so that I may use the electric starter again since I will be getting a full body fairing kit that will cover the kick starter (ie: Will a Racing Ignition Coil help??) Thanks!

sorry to say you dont have any solution except to kick start and get used to it. there aint any aftermarket big starter to handle the bigger bore cranking. unlike with the mio there is. the problem is the crankcase. the recess where the starter goes is too narrow to accommodate a bigger starter. just like MX bikes get used to kicking it till it fires.

 

[jchris1124]

try to lower the compression by putting a 1mm base gasket

 

[docgabby]

try to lower the compression by putting a 1mm base gasket

rather than giving away that precious compression..dont disable the mechanical compression release on the cam gear. or yet again if there is a manual compression release lever.

 

[jchris1124]

rather than giving away that precious compression..dont disable the mechanical compression release on the cam gear. or yet again if there is a manual compression release lever.

usually if we use hi-lift cam we remove the decomp assy.

 

[docgabby]

usually if we use hi-lift cam we remove the decomp assy.

the reason the compression release is removed with the hi lift cam is because of the profile of the cam or how the cam is built up and reground. its much easier for camprofilers to build up little but grind more. if you design the cam with sacrificing the compression release then that would best.

 

[Ryelle61]

modify a two battery! that would do it..

 

[transporter]

modify a two battery! that would do it..

ohhhhh. im using uma 62mm bore kit but my mc when i use my starting it is easy to fire up...