South West Bikers | Motorcycle Forum

hi guys i have been trying to find for a while the 200cc barrel for my xr 125 engine i know it exits as there are 200 cc versions of my bike. can any one shed any light on this one. also one other question is i have a spare barrel for my bike in the shed i was thinking about getting it ported by a companey , my only doubt is that because my engine used pushrod valves will this mean it would be point less as only so much metal could be took away ??

I would not go for a ReBore

It will make the engine very fragile and wont take the thrashing.

Take a look here http://www-staff.lboro.ac.uk/~elvpc/bik ... XR200.html

for genuine Honda bits at knock-down prices put "dave silver spares" in google

I thought XL and XR motors were quite different though

Just been looking at some specs on the XR200 engine.

Now going from 125 to 200 might not seem a lot but.

Bhp will go from 9.7 to 19 ish great news

Torque will double ish great news

Gearbox and output shaft may not take the increase for long Bad news

Also need to think about chain and sprockets.

The extra power will be good but its a big jump for the rest of the bike to handle.

Most big bore kits for 125's are around 175 and in my experiance (in the good old days of the DT125) things start going wrong as soon as you change the bore.

But could be better engineering these days.

Yeah but BEN has a fake xr125 which has a cg125 copy engine in it........ To be honest just save your money and buy a new bike when you can afford it.

right cheers for the info guys much apracitaed excuse spelling, anyways the bike needs a mot and new tax disc and due to the fact the last person who had the bike before me manage to lose the v5, i have decided to strip the bike down and build it onto a cg frame and go for a sort of cafe racer style looking bike lol . the bike will be run on a daylight mot for the time being and i pretty much have all the bit i need bar a few items . all being well in the nxt few weeks i maybe getting my hand on a mates tzrr (4hw) have had tzrs before and love them alot but ive never had a rr before so fingers crossed .


sorry bondy for spaming this section with my now useless post , nfeel free to erase this thread

if the bike is legit then you can get a new v5 from the dvla for £18. if you like small punchy singles try to track down a cb250rs - xl250 motor in a road bike frame - brilliant bikes. still probably slower than a derestricted 2stroke 125 though.

chris_1127 wrote:if the bike is legit then you can get a new v5 from the dvla for £18. if you like small punchy singles try to track down a cb250rs - xl250 motor in a road bike frame - brilliant bikes. still probably slower than a derestricted 2stroke 125 though.

yeah the bikes legit Chris but the issue is its been down the road hard , the rear sub frame is twisted quite badly and too be honest i wanna use the cg frame as i think i can build a bike preetey quick now i have almost all the required bits. would i be able to get my barrel re bored to 175 ? if so i think i will as i do have a spare engine so if all gos wrong its not the end of the world as for not being quick as a 125 2t believe me after owning two tzrs i know !!, but my old man has just moved back up to Gloucester now so i wont to take my bike up soon to see him. ive got a tasty little carb im watching on eBay at the moment which should give the bike a bit more go (kx125 carb 39mm ) i also have a fmf power cone pipe and plan open making my own link system . pics to follow soon

all depends if they use the same stroke crank, and whether theyre the same barrels with a differnt bore and liner or different barrels altogether; and if theyre different barrels whether the heads are the same and oilways line up etc etc etc. by the time you've bought a new piston and rings, gaskets to suit, paid for rebore etc it all sounds like a lot of effort and cash compared to just bolting in a bigger motor complete.

edit what i said about sub frame me being a lemon lol , anyways im gonna get this v5 stuff sorted out and get the bike into the rebuild,d progress (its your fault bondy that bloddy ktm made me do it !!). the plan is to rebuild the bike with good decent parts and to make it look like a proper motard im waiting to hear back from someone about some tzr wheels (3pc2 wheels 3spoke solid) for the supermoto conversion i have secured myself a set of brembo calipers of a tzrr 4ld ( the same as what the mito uses and also the 916 mmmm). but its apperas he deosnt wnt to know now anyone help me with this ??

I've got to say if you are planning on Re-bore, Brembo's, etc etc you would be better putting your money to a old ish KTM or DRZ.

Re-bore's arnt cheep.

And you can get a 640 LC4 Supermoto for maybe £700 - £1000 and I have seen them a lot less than that. Will be a kicker but still way more power and fun.

Get on the Motard site and look around. Ebay is also a good bet.

yeah i understand what you mean bondy and belve me if i could i would but right now im getting back on my feet its just a little project to keep me happy and have fun on . done some work on it tonite made a bottom engine subframe and removred a few brakets etc pics to come tommorw

Well get it sorted quick as I have all of June off and plan some fun out on the SMC

Bondy wrote:Well get it sorted quick as I have all of June off and plan some fun out on the SMC

lol bondy


bad news the bike took a turn for the wose today striped poaint primed up went to put first coat of crome paint on and can exeploded evberywhere shed,tools parts , not a happyt bunny , also engine moutning on engine \case has broken of and the lad who was supposed to be selling me these wheels hasnt got back to mre since last saturday. so with this in mind the project is scrapped !!. on a postive note i haVE STRUCK A DEAL with my mate to be hiss tzrr125 (4fl) so im gotta wait around 6 weeks to save dough but then will be back on the road wiuth ye olde 2 stroke power !!!