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i got a few questions for the knowledgeable guys on this site. ive already built a 61x bigbore and found it has amazing low end punch with nice all around power as well. i like to experiment a bit and was thinking about maximum pistons diameter that can go on a stock 68mm SJ stroke. i know...

if you can stuff 15-20 sheet of paper between the impeller and wear ring, then its out of specs. 15 sheets equal to 0.045" and the limits is 0.025". you should replace your impeller and/or wear ring. chk the image ive included

i got the same bottom end problem right now and my impeller too have a gap of 0.04-.05" from tip of blade to wear ring. it should be at max 0.02". it dosnt hook at all off idle but pass 1/4 throttle, yes. my seals are in good shape too, so im pretty sure its the impeller. anyway i got a new...

ill give you 50$ if you want to get rid of it :sneaky::biggrin:

i will make a bunch for anyone interested in a couple of weeks. stay tuned :biggthumpup:

heres a couple of pics of the finished job: heres what ive done to the engine so far: 61X cylinder 771cc resleeved with NW bigbore sleeve, ports are matched & polished set of 85mm Pro-X pistons 61X crankcase heavily ported and clearanced for the BB sleeves custom made girdled head...

im kinda worried with all those replies if i will ever see the 61x double intake before the end of july... :frown:

aaaaahh its working and you wont believe what was the trouble... a spark plug!!! at least ive corrected the droping sleeve problem...

i will try that. i should have put the oem head on the cylinder to prevent this. thanks all!

i guess youre right, i will reassembled the engine this afternoon and see if it runs nicely again. thank you very much guys for the help!! very appreciated

yep ive noticed my sleeve have dropped a bit. i didnt press them in place when ive heated up the cylinder, ive simply droped them in. the hot side was the one that drop the most, about 0.006" and the clean side 0.002"-0.003. ive already deck the cylinder flush again at my shop. im still...

i removed the intake manifold last night, they were all in place and it looks they were doing there job. ive changed the intake gasket for a brand new, ive reused the old one since it was in nice shape. anyway ive removed the engine from the hull for further investigations. but im wondering how...

but both of the domes oring were new and intact when i remove the head. and why the other cylinder was freakin hot? the dark piston looks like it was toasted... maaan i hope its something like an air leak or mixture related cause im starting to freak out a bit... :frown: btw thanks for your...

single 48mm lamey mega flow i swear it was running good for 10min. when i opened up the engine i was surprise how clean the other one was. plugs were firing at both cylinder, ive cheked that too.

heres the deal, ive built a 61x bigbore on 61x case, bored it to 85mm. ive put everything back together and start it up to chk if everything is working as planned. chk with the caompression gauge and got 165-160lbs. went on the lake to do the break-in. after idling the motor for 5 min, ive uped...

just as the title state, is it useless, dangerous or it can works? i know i should get some 62T cases but for right now itll be the X. ive ported mine pretty nicely, matched everything. the top end is 61X BB 771cc with 38cc dome (180psi). since i want something with arms ripping low end and may...

ive removed mine with just the ride plate out. i thougth it was easier than removing the pump actually! fighting with that threaded cap was interesting tho.... :P

ive compared both stock sleeve and NW ones when ive received them and the port timming were almost identical, +/- 0.02" lol :biggrin: everything was wider tho

those sleeves came from NW Sleeves. i took the bigbore pre-ported sleeve. 119$ each. customs raped me so bad with more than 80$ of taxes for 2... :banghead:

i must admit, porting isnt my thing... its more a mtching job than porting... the exhaust port is so wide its crazy. almost 3/16" to remove on each side. i just hope it will perform great cause im no porting expert!! ive tried to match the transfer port in the midle but it was hard to reach and...