twinshock325

Matt, apologies I should have read the question properly! I have no experience with the phbl type, worth a search on "todo trial" forum good Spanish site, the phbh mod is more common there due to regulations I think. Even if you can' t understand Spanish, specs you may get enough info. Worth a quick look I think.

Hi, I've done a couple, a M199a and a M158 both with PHBL26BS, I drew information from several other threads on trials central, PeterB being very helpful, I can't claim any credit, I copied the specs and made the adapters. I can't say it will be exact straight out of the box for your bike but it should be very close. The PHBL is sensitive to float height, my M199a bogged just off idle, I messed about quite a bit with pilot jetting until Peter put me straight, I lowered the float level slightly and reverted to the jetting here and all was good. Runs perfect every time. 270K needle jet (emulsion tube) 60 slide 36 pilot 95/100 main (250/325) D36 needle (D34 is supposed to be better with the 325 but it ran so nicely on the D36 I never got around to fitting it) The only other 'watch out' which must be common, is that the fuel filter that is part of the feed to the carb blocks very easily if the bike stands, you get the dreaded unleaded gel like substance and find the bike will not rev, just dies on wide throttle openings. Pop the connection off wipe the filter, put it back and all is good unless it's 6 months until you next ride.... Hope it helps

Hi I have the Bultaco UK unit supplied in 2005-2006 ish, not sure if this is the same as the one Dave Renham currently supplies or if Electrex supplied it to Dave? It's been really good, can't fault it. I strobed up the timing first time to a setting of 2.4MM BTDC, marked the base plate the match the case and job done. Starts everytime even when wet and is consistant, no variation as you can get with old or cheap points setup. More importantly the bike can stand for a year and needs only a splash of fuel and starts second kick. I used 2.4MM BTDC as I like the bike 'soft', anymore advance and it seems to rush into the midrange too quick for me, I don't ride often enough to be any good.....so need all the help I can get. The Dellorto did go a fair way to correcting the surge to the midrange and making the bike much easier to ride. I did notice when I strobed the ignition timing that it runs retarded (about 0.2mm) until you lift the revs above tickover, it then stabilizes at fixed setting it appears to hold throught the rev range. I set the 2.4MM BTDC at te higher rev level. Cheers Iain

Hi, I have a a PHBL26BS on a M199A, jetting as below: Needle D36 2nd notch from bottom Needle Jet 270K Pilot jet 34 Slide 60 Main Jet 100 Peter B who posts here sometimes has far greater experience than me, search PHB26BS and he'll come up. Gave me some good advice, watch the float level, it's often too high when the carb is new. I spent some time chasing jetting before I went back and reset the float level on Peter's advice. Once done it transformed the bike, crispness was back and it responds well to pilot jet changes and adjustments. It now runs very nicely on the Dellorto, easy to start, very clean at the bottom end and revs right out. I should mention I also repacked the exhaust and fitted the electronic ignition (ignition isn't a performance benefit I don't think just a maintenance reduction). Cheers Iain

I don't want you to think that I'm trying to teach you to 'suck eggs' but often getting these undone is about technique as much as tools. I've generally used an offset ring spanner for the clutch centre, make sure it's almost parallel to the handle on the clutch holding tool, so you can push the handles on each tool towards each other, sometimes using only one hand. This way you can apply a strong steady pressure without the motor trying to slide around. Works ok for the flywheel as well but not as easy, I have used some 'band type' oil filter wrenches to hold the flywheel and the same technique to good effect. If you're still struggling a bit of heat on the nut never hurts.........When you undo the flywheel work from the front of the motor, the clutch drum can do a fantastic job of removing knuckles if you slip.................