Engine Mods

[Gav]

I have a Mariner 200 approx 1992, are there any mods available to increase hp???

[roofer]

how about opening exhaust and inlet ports up,fitting high compression heads and bigger jets in carbs.

[Gav]

what sort of costs are involved?? and who to do the work??:crimbo3:

[roofer]

havent a clue but i know a man who will,i'll pm you his details

[JamesM]

Originally posted by roofer
how about opening exhaust and inlet ports up,fitting high compression heads and bigger jets in carbs.

Higher compresion is allways the best place to start. You should have about 125PSI with 37cc head as standard. 33cc heads will give you about 145PSI. This is as far as you can safely go on pump gas.

If you want to rev to more than 6 grand you need to get rid of the oil injection and swap the 40 amp stator to a 16 amp one.

The motor will rev to nearly 7 grand with the standard porting, but standard cast pistons are only good for 7000 RPM anyway. Therefore unless your going to fit forged pistons the port work would really be worth it.

So if you dont want to spend much go for higher compression, get rid of the oil injection, 16 amp stator and you could fit the 2 stage reads from an XR2, unless you have a 7 petal front end which some of the early 2.5 200's did. Rejet the carbs acordingly, probably just going up one size should do it.

[Gav]

Thanks 4 info!

Forgot to mention that the powerhead is a 1999 model......... if this helps any??

[fish]

if you are going to go from the 40amp stator to the 16, you might want to also think about a lightened flywheel. the combo (16a stator and lighter flywheel) I beleive is good for a couple hundred rpm and easier on the crank. No more HP than before, but turn the motor higher rpm's.

fish

[JamesM]

Originally posted by Johnny Boat Dude
The motor will rev to nearly 7 grand with the standard porting, but standard cast pistons are only good for 7000 RPM anyway. Therefore unless your going to fit forged pistons the port work would really be worth it.

'wouldn't really be worth it' that was meant to say 'wouldn't really be worth it'

Its not my fault!!! I have a right handed keyboard but I'm ambidextruose, ambodestreyus, ambi, I can type with both hands at the same time

[Foolish]

perhaps you need one of these

A Little extra power !

[Gav]

OK i have made a start!


Bullet gearcasingand some racing carb setup off a 2.4 bridgeport.

cheers cyco

[BREN]

is it for your boat gav?

[Gav]

Originally posted by BREN
is it for your boat gav?

Yes for the "dirty boat!" ........SOULtime



Captain can i post the 600 graphic? actually better if you post it

[Captain Chaos]

ok, but it'll look pooh in 640x480

[Captain Chaos]

irredesent orange & mirrored silver.............with a smidgin of luck

record will have whatever label Gav chooses.

[Jon]

Looks Great Captain.

I wonder what "The Black Pearl" would look like in black and silver?

[Gav]

OOOOHHHHHH look at That!!

Slick! Well done CC!

[Hydrostream]

Gav, whats the no. on the carbs and are they going on a 2.5?

How far are you planning to go with the mods? Just bolt on or more?