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rgv250
22nd October 2010, 13:25
hey guys my rgv started back firing so iv cleaned exchaust out and redone flange seals and still doing it. a mate told me that the spark plug could be burning to hot and put a hole in top of piston? it will idle on one and the other one back fires every 10seconds or so. im really looking for a good 2 stroke or rgv mechanic around manawatu palmerston north. im guessing about 6-800 to rebuild top end and could be worth it but would like more info.... if someone can help? thanx

White trash
22nd October 2010, 13:28
hey guys my rgv started back firing so iv cleaned exchaust out and redone flange seals and still doing it. a mate told me that the spark plug could be burning to hot and put a hole in top of piston? it will idle on one and the other one back fires every 10seconds or so. im really looking for a good 2 stroke or rgv mechanic around manawatu palmerston north. im guessing about 6-800 to rebuild top end and could be worth it but would like more info.... if someone can help? thanx

Sounds like a holed piston. They're also notorious for clipping a powervalve lip which causes some nasty bore wear. Dunno how keen Ozzy Performance is on 2 strokes but he's a good bugger. Also the Sales at Total Motorcycles may be able to help.

imdying
22nd October 2010, 14:45
Yup, bad news, it sounds rooted.

Two things:
- Take the powervalves out and inspect them
- Take the heads off and inspect the cylinders and bores

If the cylinders are ok, then maybe $600-800, if not, assuming the crank is fine, then closer to a bit over $2000.

White trash
22nd October 2010, 15:19
I've got 500 bucks to buy it if it turns out to be poked mate.

Let me know.

rgv250
22nd October 2010, 15:22
iv jst pulled tank off etc and pull plug out put my finger over plug hole and kickd it over slowly and i can feel compresion, so does tht mean anything? i looked down inside cyclinder and cant c any holes as such...? dnt know much bout it but i wouldnt mind geting it going cheaply myself, could it be a carb prob? coil? any ideas would help but looks like i gota take it to a shop :(

White trash
22nd October 2010, 15:24
iv jst pulled tank off etc and pull plug out put my finger over plug hole and kickd it over slowly and i can feel compresion, so does tht mean anything? i looked down inside cyclinder and cant c any holes as such...? dnt know much bout it but i wouldnt mind geting it going cheaply myself, could it be a carb prob? coil? any ideas would help but looks like i gota take it to a shop :(

Bring it to my place and go home with five hundy mate. I reckon it's clipped a power valve and munted the piston/cylinder lining.

Drain all the coolant out, pull that head off and turn the motor over so the piston's at the bottom. That will tell you enough to know if the bore has been damaged in anyway and you'll be able to see the crown of the piston to know if it is holed.

Edit: Have you actually tried jsut replacing the plugs first?

rgv250
22nd October 2010, 15:29
i tryed swaping the plugs round and it stil did it on same one. i did get the bike cheap so i knew this was bound but i wanted it to happen after summer haha its worth bit more then 500 to me mate other wise id b keen. its got near new tyres and shit. well im thinkn bout goin to the shed to pull the head off. were are you from mate? thanx

by the way does it mean anything tht it happend at high rpm? at speed under load

White trash
22nd October 2010, 15:46
i tryed swaping the plugs round and it stil did it on same one. i did get the bike cheap so i knew this was bound but i wanted it to happen after summer haha its worth bit more then 500 to me mate other wise id b keen. its got near new tyres and shit. well im thinkn bout goin to the shed to pull the head off. were are you from mate? thanx

by the way does it mean anything tht it happend at high rpm? at speed under load

Nah all good, I've owned a few and I know what they're like. Bear in mind when you start pulling it to bits, head gaskets are stupidly expensive for them and in no way reusable. On the OFF chance the barrel/liner and piston are OK and it's something else, I reccomend removing the motor and then taking the barrel off with the head attached. With piston/cylinder damage each time the motor turns over, the damage is being magnified. Especially if you've got little bits of piston ring swimming round in your crank cases. Good luck dude and let us know how you get on.

rgv250
22nd October 2010, 16:01
yea mate i jst went and put it basicly back togeather and cleaned the plugs and kicked it over and it went mint first pop then after 30seconds started back firing again? all iv done is take carbs off and put back on tightly pretty much. they were all prety loose etc. the bike is abit dodgy. could it b the oil pump or is it worth pulls carbs off and apart? thanx heaps mate im stuck here cause i know alil but fuk all. and dnt really wanna have to pay heaps at a shop. thanx again

and wats the usall for how long a tank of 2 stroke oil last in ur ones? its does seem to use abit....

Teflon
22nd October 2010, 16:55
http://www.rgv.ru/manual.html

http://cgi.ebay.com/FULL-COMPLETE-GASKET-SET-FITS-SUZUKI-RGV-250-M-N-P-R-T-/280551395663?pt=UK_Motorcycle_Parts&hash=item41522a914f

White trash
22nd October 2010, 17:12
yea mate i jst went and put it basicly back togeather and cleaned the plugs and kicked it over and it went mint first pop then after 30seconds started back firing again? all iv done is take carbs off and put back on tightly pretty much. they were all prety loose etc. the bike is abit dodgy. could it b the oil pump or is it worth pulls carbs off and apart? thanx heaps mate im stuck here cause i know alil but fuk all. and dnt really wanna have to pay heaps at a shop. thanx again

and wats the usall for how long a tank of 2 stroke oil last in ur ones? its does seem to use abit....

Process of elimination I'm sorry mate. Could be blocked jets in the carbs. Could be a weak spark. Could be fucked HT lead. Could be a coil. Could even be a flat battery. No shit.

rgv250
22nd October 2010, 17:18
the battery was new wen i got it and it seems mint with headlight on without goin. i think im gna look at couple new plugs and clean carbs and try again. other wise i gota try find coil etc and getin real hard to find any parts for it :( mite just wack on trademe $1 reserve haha thanx mate im gna get it taken into a mates shed in twn and try get a mechenic to cme look at it as im out ashy so then i should know more and wen i do il post it cause hopfully good news :D

onearmedbandit
22nd October 2010, 18:25
Two coils? Swap them over and see if it's doing it on the other cylinder.

Peter Smith
22nd October 2010, 19:59
In my humble opinion you could waste heaps of time and money trying to find whats wrong. Take it to a good bike shop that has a mechanic who knows RGV's and ask him to find out whats wrong and get an estimate on what it would cost to fix it.
Those 250's are alot of fun, but need alot of maintenance.
Good Luck dude. :yes::yes:

Teflon
23rd October 2010, 06:18
http://www.rgv250.co.uk/forums/index.php?/topic/29096-compression-test/

http://www.trademe.co.nz/Building-renovation/Tools/Hand-tools/Measuring/auction-325033208.htm

SS90
24th October 2010, 06:58
The best option is to take it to a shop, with them understanding that you do not have any money.

If you pull the body work etc off, any mechanic worth half a shit will be able to pull both cylinders off (leaving the heads on) and inspect the cylinders.

As Whitetrash has said, the most likely cause will be the power valves causing you grief.

HOWEVER....

there is one (easier) POSSIBILITY, the is a CHANCE that the ignition pick up could be faulty, as the symptom you describe is an indication of a sick pick up ( that's the wee black square box that sits outside the flywheel and is respsonsible for telling the ignitor box when the each cylinder is coming up to TDC, so the ignitor box can decide ignition timing for a given RPM

If has been about 8 years or so since I have worked on RGV's, and I currently cannot recal if theta have a twin pick up or single pick up system on an RGV.

If it is a twin system, simply measure the resistance of the pickups when the engine is cold, and remeasure when the engine is hot, the one that changes dramatically is likely your problem.

If it us a single pick up system, it's not the problem.

People often blame coils, but coils is something the Japanese do really well, and even on 20 year old stuff, generally speaking, they last the distance.

When all is said and done, if you only follow one piece of advise ( other than NOT selling Jimmy your bike for 500 handy) then, no matter what the fault is, YOU MUST REMOVE THE POWER VALVES AND SERVICE THEM BEFORE YOU RIDE 1 MORE KILOMETER

In this case you do not even need to remove the cylinders from the machine (unless inspection shows disaster), as they where designed to be servived in place, it is just unfortunate that no one ever actually serviced them when they should ace done.

there will be plenty of information available on how to do this on the net, and I am sure there are pictures as well.

In fact, just ask Whitetrash to come round to your place this Sunday (he brings the beer) and do it for you.

he has nothing better to do:scooter:

White trash
24th October 2010, 09:04
Bwahahaha, yeah I'e got nothing better to do alright. If I was in the Manawatu I'd be hapy to lend a hand mate, but he's a bit far away.

Still got my five hundy burning a hole in my pockets ;)

rachprice
24th October 2010, 09:54
RGVs are heartbreakers from personal experience of my own tattered heart haha

But I know if I had the chance, Id just go back for more :love:

White trash
24th October 2010, 11:09
I'm real keen on a VJ21 for Pre-89 Junior but people still want moonbeams for the fucken things. Mmmmmm RGVs.....:love:

rgv250
24th October 2010, 11:23
yea mines the vj22a. its got 2 coils. iv got the carbys off a and going to giv them a good clean and get new plugs put new gas and 2 smoke oil in and try again and if no better im going to hav to take to shop :( i dnt want to pull it to far apart myself as i prob wont get it back togeather going haha i really jst want to keep it running to winter then i can park it up and recon... gutted atm its such a nice day and got no bike to ride :( oh well il keep tryin and if anyone knws any1 round palmy thts good with a 2 stroke please help! :D thanx guys

SS90
24th October 2010, 11:36
yea mines the vj22a. its got 2 coils. iv got the carbys off a and going to giv them a good clean and get new plugs put new gas and 2 smoke oil in and try again and if no better im going to hav to take to shop :( i dnt want to pull it to far apart myself as i prob wont get it back togeather going haha i really jst want to keep it running to winter then i can park it up and recon... gutted atm its such a nice day and got no bike to ride :( oh well il keep tryin and if anyone knws any1 round palmy thts good with a 2 stroke please help! :D thanx guys

If you keep riding it you will be selling it to Jimmy for $320 (less transport) when the power valves make the "cast alloy meets forged alloy" sound.

Pay no attention to me, I don't know my are from my elbow.

rgv250
24th October 2010, 12:07
yea thts wat im worried bout :( and very hard pushing to find another motor for it nw.... wats it worth to do the power valves etc? coz mite jst be better for me to sell it and buy a cheap shiter... as the rgv blows the new learner law outa the water.
this really sux all i want to do is ride :( oh well looks like itl get inspected then probly on trademe as is and try get another bike. churs for ya helps guys

RDjase
24th October 2010, 13:20
I'm real keen on a VJ21 for Pre-89 Junior but people still want moonbeams for the fucken things. Mmmmmm RGVs.....:love:

I sold my NZ new VJ21L with 34carbs a month ago, 10/89 build date had a few spares as well

Wish I had known you wanted 1

Are you going to Manfeild this weekend?